taxonID	type	description	language	source
03BFB40BFFCB2777FDDBB44EFAF4F893.taxon	type_taxon	Type species Monochorhynchus wahri Muir, 1917 (by original designation).	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCB2777FDDBB44EFAF4F893.taxon	description	Description HEAD AND THORAX. Head including eyes somewhat narrower than pronotum, conjunction of vertex and frons angular and not protruding in profile. Vertex nearly trapezoidal, width of base greater than length, about twice that of apex, anterior margin distinctly carinate and slightly convex medially, and posterior margin roundly emarginate, basal area depressed, rising to apex. Frons narrow, with lateral marginal carinae widened and slightly separated by fine median sulcus in basal half, but thin and begin to abruptly diverge distad at same level as anterior apical angles of eyes. Clypeus triangular, longer than frons, with two longitudinal lateral carinae and stouter median one. Rostrum robust and elongate, extending beyond coxae of hind legs, with apical segment short and greatly enlarged at apex, forming sucker-like pad. Eyes reniform, with ventral margins obviously concave inwards, anteroventral angle protruding to near middle of frons; ocelli present. Antenna about half length of frons, pedicel cylindrical and truncated apically, with dense sensilla, flagellum terminal. Pronotum extremely short at middle, anterior margin obtusely convex, and posterior margin deeply concave, lateral parts expand to patagium-like, with dense tubercles. Mesonotum developed and diamond-shaped, with longitudinal median carina and two lateral ones, disc raised, often with tubercles along carinae, scutellum nearly trapezoidal. Tegmina elongate, about 3.5 – 3.7 × as long as widest portion, narrowest basally and widest centrally, then slightly constricted distad, posterior margin arched, costal margin relatively straight with sensory pits in basal half, jugal margin slightly protruding, apical margin slightly emarginate. Costal veinlets (hm) connecting ScP + R (1) and ScP + RA (4) to costal margin; ScP + RA separating from RP before basal third of tegmina and slightly distad of CuA forking; RA 2 with two terminal branches; RP with four terminal branches, RP 1 sinuate; MP with nine terminal branches, MP 3 + 4 forked in single MP 3 and MP 4, MP 2 single, MP 1 b two-branched, MP 1 a four-branched, six veinlets connect every two branches of MP from MP 3 to MP 1 aaa (not including between branches of MP 1 b); CuA forked before first m-cu, CuA 1 and CuA 2 fused near apex to form a common stem and extending to posterior margin, C 5 present; Pcu connected with A 1 at basal third of clavus; clavus open, narrow, and elongate, expanded apically. Tegminal markings scattered and veins mottled. Wings slightly shorter than half of tegmina and narrowly round at apex, with anterior margin slightly convex at middle; ScP + RA separating from RP before middle, MP with two branches, CuA with two branches, CuP, Pcu, and A 1 relatively short and straight, stridulatory plate present with convex outer margin. Metatibiotarsal formula: 5 - (7 – 8) - 6. MALE GENITALIA. Anal tube nearly triangular or trapezoidal in dorsal view, with lateral margins gradually converging distad, anal stylus located about middle, epiproct subrectangular, paraprocts elongate and cylindrical, extending to or beyond apex of anal tube, with few setae at apex; in lateral view, more than apical half part inclined ventrad, with slight dorsal process before turning point. Pygofer with laterodorsal angles round and not protruding, medioventral process present. Gonostylus short and broad, posterior part subquadrate, apex wider than base, dorsal margin thinly membranous, with auricular process at subapical part, dorsal apical angle acute and upcurved, apical margin medially protruding inwards; anterior part of gonostylus as long as posterior part, slender and clavate. Phallic complex broad and very complex, with various processes. FEMALE GENITALIA. One of highly reduced types of subtribe Lyddina Emeljanov, 1995. Anal tube (AT) highly modified into anal ring terminating in two styliform processes, dorsal epiproct, and ventral paraprocts clavate and extending caudad. Pygofer (segment VIII) annular, developed, and wellsclerotized, prominently expanded ventrally, with two spiracles (Sp) adjacent to anterolateral angles, surrounded by sclerotized plates. Medioventral plate (mvP) of segment VIII present. Intermedia plates (imP) paired and located dorsally to mvP. Anteroventral lip under oviporus following imP. Intergonocoxal plate IX (iGxP) more or less membranous. Gonocoxa IX developed. Gonoplac (Gp) laminated and C-shaped. Impaired mediodorsal sclerotized plate (mdP) connected ventrally to tergite IX.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCB2777FDDBB44EFAF4F893.taxon	discussion	Remarks In the key provided by Fennah (1952), the genus is misplaced based on the following distinctions: 1) “ Antennae generally longer than frons ”; however, Muir’s (1917) illustrations showed that the antennae are distinctly shorter than the frons. 2) “ Media generally with five sectors ” and “ first medial sector with two to four branches ”; Muir’s (1917) descriptions stated, “ Tegmina with six median sectors, the third furcate ”, and further notes, “ The tegmen in this genus is similar to that in Paraproutista (syn. Pamendanga Distant, 1906) ”. This genus closely resembles Helcita Stål, 1856, and Formodanga Yang & Wu, 1994, but can be separated from them by the following features: 1) vertex with anterior margin distinctly carinate and slightly convex medially, whereas in Formodanga, vertex with anterior margin indistinctly carinate and distinctly incised medially; 2) head in profile not produced conically, whereas in Helcita, head in profile produced conically. In addition, sucker-like apical segment of rostrum, elongate paraprocts of males, and mottled tegminal veins (unknown in M. wahri) may be important features of this genus. The current research provides the first descriptions of female genitalia of this genus, and the reduced features support the classification of this genus under the subtribe Lyddina. The greatly enlarged apical segment of the rostrum easily distinguishes it from other genera within the subtribe (e. g., Proutista Kirkaldy, 1904 and Diostrombus Uhler, 1896) (Fig. 1 B – D). Checklist of the species of Monochorhynchus Muir, 1917 1. Monochorhynchus dehongensis sp. nov. Distribution: China (Yunnan) 2. Monochorhynchus obscurus sp. nov. Distribution: China (Guangxi) 3. Monochorhynchus psammochroma sp. nov. Distribution: China (Fujian) 4. Monochorhynchus wahri Muir, 1917 Distribution: Borneo	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE2770FDD9B231FEFAFC98.taxon	diagnosis	Differential diagnosis Monochorhynchus whari can be separated from the three new species by several key characters: 1) body brownish (whereas dark brown in M. dehongensis sp. nov. and M. obscurus sp. nov.); 2) pygofer with medioventral process angular (whereas round in M. dehongensis and truncated in M. psammochroma sp. nov.); 3) in profile, anal tube with apex curved caudad and single (whereas relatively straight in all three new species, and bifurcated in M. psammochroma).	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE2770FDD9B231FEFAFC98.taxon	discussion	Remarks Monochorhynchus whari is the type species of the genus, distributed in Borneo. Due to the difficulty in obtaining the type material, a direct comparison with the new species described here was not possible; consequently, our understanding of M. whari is based solely on the original description and illustrations by Muir (1917).	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE277DFDC5B041FB17FBDD.taxon	description	urn: lsid: zoobank. org: act: 4393 C 698 - 5579 - 4 D 0 B-BA 49 - BF 50 BB 7 E 4 F 9 D Figs 1 – 3, 8 – 11	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE277DFDC5B041FB17FBDD.taxon	diagnosis	Diagnosis This species can be easily separated from M. wahri by its dark brown coloration and the round medioventral process of the pygofer. In contrast, M. wahri has a brownish coloration and an angular medioventral process of the pygofer.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE277DFDC5B041FB17FBDD.taxon	etymology	Etymology The specific epithet refers to the collection site ‘ Dehong’.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE277DFDC5B041FB17FBDD.taxon	materials_examined	Type material Holotype CHINA • ♂; Yunnan Province, Dehong prefecture, Longchuan County, Shihuiku; 97.8355 ° E, 24.3430 ° N; 1234.5 m a. s. l.; 3 Aug. 2024; Ai Deqiang leg.; NWAFU. Paratypes CHINA • 6 ♀♀; same data as for holotype; NWAFU.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE277DFDC5B041FB17FBDD.taxon	description	Description MEASUREMENTS. Body length (incl. tegmen): male (N = 1) 13.0 mm, female (N = 6) 13.0 – 13.3 mm; length of tegmen: male (N = 1) 11.5 mm, female (N = 6) 11.5 – 11.8 mm. COLORATION. Body generally dark brown (Fig. 1 A). Vertex with lateral marginal carinae yellow, and disc dark brown with midline white, anterior margin brown and posterior margin white (Fig. 2 A). Frons dark brown, with clear white spot at middle of base, and two white spots on each inside of lateral marginal carinae, carinae brown (Fig. 2 B). Gena brownish, tinged slightly darker around eye, and much darker around antennal socket and above eye, white behind antenna and in ventrolateral angle (Fig. 2 C). Clypeus brown, in frontal view, with white spot at base and longitudinal brownish stripe along median carina, three carinae brown (Fig. 2 B); in lateral view, each lateral part with large white spot at base, and longitudinal brownish stripe in middle (Fig. 2 C). Labrum white (Fig. 2 B). Rostrum with second segment gradually darker towards subapical part, apex white; apical segment dark brown (Fig. 2 B – C). Eyes gray; ocelli white. Antennae brown with sensilla white (Fig. 2 A – C). Pronotum dark brown, midline and margins white, each lateral part with two large brownish stripes behind eye, some white tubercles, and row of smaller yellow tubercles (Fig. 2 A – C). Mesonotum brown, tinged darker between lateral carinae, with two longitudinal lighter lines on lateral sides of median carina, and two white spots behind yellow lateral angles; median carina white, lateral carinae white with broader white markings along them, and dark spots at anterior quarter, slightly widened at middle and expanding inwards near posterior margin; scutellum white (Fig. 2 A, C). Tegula brownish, with darker stripe adjacent to posterior margin (Fig. 2 A). Tegmen generally dark brown, almost every apical cell with white to yellowish spots adjacent to margins, basal half with large yellowish region with fewer dark markings, delimited by MP, MP 2, subapical line, and postclaval margin, radial cell with four white spots, C 2 with two white spots, subapical line with some white spots; veins mottled, mainly dark brown, with yellow spots (Fig. 2 F). Wing semitransparent, with brown to dark brown markings. Legs yellowish, fore and middle legs with brown stripes on first three segments, tibiae and tarsi generally brown; hind leg lighter than first two legs, with darker markings at apex of tibia (Fig. 2 B – C, E). Abdomen dark brown on dorsal side with many small yellow spots, and lighter on ventral side. HEAD AND THORAX. Vertex with width of base 1.9 × as long as length of midline (Fig. 2 A). Antenna with pedicel about 2.6 × as long as widest portion, slightly constricted apically (Fig. 2 A – C). Pronotum with small tubercles arranged in lines parallel with posterior margin (Fig. 2 A). Mesonotum with few small tubercles along posterior portion of median carina (Fig. 2 A). Tegmina about 3.7 × as long as widest portion (Fig. 2 F). Metatibiotarsal formula: 5 - (7 – 8) - 6 (Fig. 2 E). MALE GENITALIA. Anal tube tongue-shaped in dorsal view, with midline length about 1.6 × as long as basal width (excluding basal angles), apex round, basal half with trapezoidal ventral opening, lateral margins slightly incised medially, becoming elevated and infolded posteriorly (Fig. 3 B); in lateral view, basal third relatively straight, with two basal angles protruding ventrad and dorsal process protruding dorsocaudad before turning point, apical two thirds triangular and inclined ventrad, with dorsal margin straight, paraprocts extending beyond apex of anal tube (Fig. 3 A). Pygofer rectangular in ventral view, with medioventral process slight and round (Fig. 3 E). Gonostyli subrectangular in dorsal view, with apical process extending inwards, lamina sclerotized and C-shaped (Fig. 3 C); in lateral view, with auricular process protruding outwards, blunt and hirsutiusculus at apex (Fig. 3 D); in caudal view, apical margin irregular, deeply concave in ventral quarter, with apical process narrow-acicular at ventral third, and small angular process at dorsal third (Fig. 8 C). Phallic complex robust and broad, in dorsal view, periandrium gourd-shaped, with left margin double-arched, right margin arched in basal portion and relatively straight in apical portion, five characteristic processes: 1) elongate and sinuous process (P 1) originating from mid-left margin, extending beyond right margin, with main portion curved caudad, apex acute and recurving cephalad; 2) broad and curved process (P 2) originating from mid-left margin, following apical portion of left margin, with apex acute and directed right-caudad, slightly exceeding apex; 3) short and spinous process (P 3) originating from subapical right margin, extending caudad, with apex acute; 4) elongate and triangular process (P 4) originating from apical dorsum, extending cephalad to basal third, with apex straight and acute; 5) broad and flat process (P 5) adjacent to P 4 on its right dorsal side, also originating from apical dorsum, and extending cephalad to basal third, with apex constricted and curved rightwards (Fig. 3 F). In lateral view, P 1 arched dorsad basally, sinuous and gradually tapered distad, P 2 horn-shaped and upcurved, P 3 short and extending to level of P 2 apex, P 4 and P 5 extending dorsocephalad; endosoma small; aedeagus cylindrical and sclerotized at base (Fig. 3 G – H). FEMALE GENITALIA. Pygofer without dorsolateral tergal processes and ventrosternal processes. Medioventral plate with dorsolateral angles obtusely angular, dorsal margin slightly convex at each lateral quarter. Intermedia plates hammer-shaped, not directly connected to other sclerotized structures, broad at bases, narrow at apices that meet medially, displaying faint dividing line at middle. Intergonocoxal plate IX with ventral margin slightly incised at middle, sclerotized parts double-C-shaped and widened subapically, and with short rod along median incision. Gonocoxa IX with dorsolateral angle angularly convex. Gonoplac in caudal view, broadest near base and apex, obtusely angular at base, slightly incurved at apex. Mediodorsal sclerotized plate semi-circular and slightly concave at middle (Figs 2 D, 8 F).	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE277DFDC5B041FB17FBDD.taxon	biology_ecology	Host plant association An unidentified bamboo species (Poaceae Barnhart: Bambuseae Kunth ex Dumort.), likely belonging to the genus Bambusa Schreb., Thyrsostachys Gamble, or Dendrocalamus Nees. DNA Barcode The COI sequence was uploaded to the Nucleotide database of GenBank with the accession number (PX 568410).	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFCE277DFDC5B041FB17FBDD.taxon	discussion	Remarks Unfortunately, owing to delicate hind wings, we were unable to fully document them. In this species, between gonoplacs and medioventral plate, there is a pair of intermedia plates (imP), strongly sclerotized (Figs 2 D, 8 F). Morphologically, these plates resemble the gonocoxae VIII of Proutista moesta and P. pseudomoesta in shape and position (Chen et al. 2025); however, their anteroventral margins are not directly connected to the posterodorsal margin of sternite VIII, and they coexist with the medioventral plate (mvP). Presumably, these unique intermediate plates are characteristic of the entire genus. This structure also likely represents an intermediate state of reduction of gonapophyses VIII, constituting a transitional stage between the well-developed condition (as in subtribe Zoraidina Muir, 1913) and the complete absence observed in genera (e. g., in Proutista and Shizuka).	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC32779FDDEB782FB55FDC3.taxon	description	urn: lsid: zoobank. org: act: 6 BCE 791 D- 3049 - 4218 - 8298 - 814 EFFFD 00 D 1 Figs 4 – 5, 8	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC32779FDDEB782FB55FDC3.taxon	diagnosis	Diagnosis This species is easily separated from M. wahri by coloration, and from M. dehongensis sp. nov. by its dark brown coloration and straight anal apex in profile. In contrast, M. wahri with a brownish coloration and anal apex curved caudad in profile.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC32779FDDEB782FB55FDC3.taxon	etymology	Etymology The specific epithet is derived from Latin ‘ obscurus ’ (‘ dark’, ‘ shadowy’), referring to the predominantly dark coloration of the integument.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC32779FDDEB782FB55FDC3.taxon	materials_examined	Type material Holotype CHINA • ♂; Guangxi Zhuang Autonomous Region, Guilin City, Longsheng County, Huaping, Anjiangping; 2 Aug. 2006; Guo Hongwei leg.; NWAFU. Paratypes CHINA • 2 ♂♂; same data as for holotype; NWAFU.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC32779FDDEB782FB55FDC3.taxon	description	Description MEASUREMENTS. Body length (incl. tegmen): male (N = 3) 12.2 – 12.4 mm; length of tegmen: male (N = 3) 10.7 – 10.9 mm. COLORATION. Body generally dark brown (Fig. 4 A – C). Vertex with lateral marginal carinae light orange, and disc dark brown with midline lighter, anterior margin light orange and posterior margin white (Fig. 4 A). Frons dark brown, with clear white spot at middle of base, and column of small unclear spots on each inside of lateral marginal carinae, carinae light orange (Fig. 4 B). Genae light orange, tinged dark brown around eye and antennal socket, white behind antenna and in ventrolateral angle (Fig. 4 C). Clypeus dark brown, in frontal view, with short light orange stripe along basal quarter of median carina, three carinae brown (Fig. 4 B); in lateral view, each lateral part with large white spot at base (Fig. 4 C). Labrum white (Fig. 4 B). Rostrum with second segment white at base and apex, gradually darker towards middle; apical segment dark brown (Fig. 4 B – C). Eyes dark gray; ocelli light orange. Antennae dark brown with sensilla white (Fig. 4 A – C). Pronotum dark brown, midline and margins yellow, each lateral part with two large lighter stripes behind eye, some yellow tubercles, and row of smaller yellow tubercles (Fig. 4 A – C). Mesonotum brown, tinged darker between lateral carinae, with two longitudinal slightly lighter lines on lateral sides of median carina, and two white spots behind lateral angles; median carina yellow in anterior half and white in posterior half, lateral carinae generally yellow with dark spots at its anterior quarter, white spots at posterior third expanding inwards; scutellum yellow to light orange (Fig. 4 A, C). Tegula dark brown (Fig. 4 A – B). Tegmen generally dark brown, almost every apical cell with white spots adjacent to margins, basal half with large white region with fewer dark markings, delimited by MP, MP 2, subapical line, and postclaval margin, radial cell with four white spots, C 2 with two white spots expanded posteriorly into circular shapes, subapical line with some white spots; veins mottled, mainly dark brown, with light orange spots (Fig. 4 F). Wing semitransparent, tinged brownish in apical quarter, and brown along veins, with subquadrate dark brown near middle, from anterior margin to CuA 1, another one near base, from MP to A 1, and small oval brown spot at apex of CuA 2; veins dark brown (Fig. 4 D). Legs yellowish, fore and middle legs with brown stripes on first three segments, tibiae and tarsi generally brown; hind leg lighter than first two legs, with slightly darker markings at apex of tibia (Fig. 4 B – C, E). Abdomen dark brown on dorsal side with many small yellow spots, and lighter on ventral side (Fig. 4 A, C). HEAD AND THORAX. Vertex with width of base 2.6 × as long as length of midline (Fig. 4 A). Antenna with pedicel about 2.3 × as long as widest portion, slightly constricted apically (Fig. 4 A – C). Pronotum with small tubercles almost arranged in lines parallel with posterior margin (Fig. 4 A, C). Mesonotum with few small tubercles along three carinae (Fig. 4 A). Tegmina about 3.6 × as long as widest portion (Fig. 4 F). Metatibiotarsal formula: 5 - 8 - 6 (Fig. 4 E). MALE GENITALIA. Anal tube triangular in dorsal view, with midline length about 1.9 × as long as basal width (excluding basal angles), apex obtusely angular, basal half with subquadrate ventral opening, lateral margin very slightly incised medially, becoming elevated and infolded posteriorly (Fig. 5 B); in lateral view, basal third relatively straight, with two basal angles protruding ventrad and dorsal process protruding caudad before turning point, apical two thirds triangular and inclined ventrad, with dorsal margin relatively straight, paraprocts extending beyond apex of anal tube (Fig. 5 A). Pygofer rectangular in ventral view, with medioventral process slight and obtusely angular (Fig. 5 C). Gonostylus subrectangular in dorsal view, with apical process extending inwards, lamina sclerotized and C-shaped (Fig. 5 E); in lateral view, with auricular process protruding outwards, acute and hirsutiusculus at apex (Fig. 5 D); in caudal view, apical margin irregular, moderately concave in ventral quarter, with apical process broad-triangular at middle, and small angular process at dorsal third (Fig. 8 D). Phallic complex robust and broad, in dorsal view, periandrium gourd-shaped, with left and right margins both double-arched, five characteristic processes: 1) elongate and sinuous process (P 1) originating from mid-left margin, extending before right margin, with main portion curved caudad, apex acute and recurving cephalad; 2) broad and curved process (P 2) originating from mid-left margin, following apical portion of left margin, with apex acute and directed right-caudad, not reaching apex; 3) short and spinous process (P 3) originating from subapical right margin, extending caudad, with apex acute; 4) elongate and triangular process (P 4) originating from left apical dorsum, extending cephalad to middle, with apex gradually tapered; 5) broad and flat process (P 5) separated from P 4, originating from right apical dorsum, and extending cephalad to middle, with apex constricted and slightly curved rightwards (Fig. 5 G). In lateral view, P 1 not arched dorsad basally, gradually tapered distad, P 2 curved dorsad basally, recurving caudad distally, P 3 extending beyond level of P 2 apex, P 4 very slender and P 5 broad-foliar, both extending dorsocephalad; endosoma large; aedeagus cylindrical and sclerotized at base (Fig. 5 F, H).	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC72762FDF3B1A4FBCCFB10.taxon	description	urn: lsid: zoobank. org: act: 58 B 2 F 14 F- 7746 - 42 C 2 - B 966 - 536528 F 8 A 81 F Figs 6 – 8	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC72762FDF3B1A4FBCCFB10.taxon	diagnosis	Diagnosis This species closely resembles M. wahri in general coloration, but can be separated from it by its truncated medioventral process of the pygofer and bifurcated anal apex in profile. In contrast, M. wahri with angular medioventral process of the pygofer and anal apex single in profile.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC72762FDF3B1A4FBCCFB10.taxon	etymology	Etymology The specific epithet derives from the Greek ‘ psammos’ (‘ sand’) and ‘ chroma’ (‘ color’), referring to the distinctive sandy-yellow coloration of the tegmina and body; the name is in apposition.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC72762FDF3B1A4FBCCFB10.taxon	materials_examined	Type material Holotype CHINA • ♂; Fujian Province, Quanzhou City, Dehua County, Shuikou Town; 6 Nov. 1974; Li Fasheng leg.; CAU.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
03BFB40BFFC72762FDF3B1A4FBCCFB10.taxon	description	Description MEASUREMENTS. Body length (incl. tegmen): male (N = 1) 11.9 mm; length of tegmen: male (N = 1) 10.4 mm. COLORATION. Body generally brownish (Fig. 6 A – C). Vertex with lateral marginal carinae white, and disc brown with midline lighter, anterior and posterior margins white (Fig. 6 A). Frons brown, with clear white spot at middle of base, and five white spots inside of each lateral marginal carina, of small, medium, small, large, and medium size, respectively, carinae white (Fig. 6 B). Genae brown, tinged white around antennal socket and behind it, and in ventrolateral angle (Fig. 6 C). Clypeus brown, in frontal view, with longitudinal white stripes along carinae, three carinae white (Fig. 6 B); in lateral view, each lateral part with large white spot at base (Fig. 6 C). Labrum white (Fig. 6 B). Rostrum with second segment white at base and apex, gradually darker towards middle; apical segment with base brownish, darker distad (Fig. 6 C). Eyes dark gray; ocelli white. Antennae brown with sensilla white (Fig. 6 A – C). Pronotum brown, midline and margins yellow, each lateral part with two large brownish stripes behind eye, some white tubercles, and row of smaller white tubercles (Fig. 6 A – C). Mesonotum brownish, with longitudinal brown stripes along carinae, round brown marking anterior to scutellum, and two white spots behind lateral angles; three carinae generally white, lateral ones with dark spots at anterior quarter, white spots at posterior third slightly expanding inwards; scutellum white to yellowish (Fig. 6 A, C). Tegula brownish, with brown stripe adjacent to posterior margin (Fig. 6 A – B). Tegmen generally brownish, almost every apical cell with white spots adjacent to margins, basal half with large white region with fewer dark markings, delimited by MP, CuA 2, first m-cu, and postclaval margin, radial cell with four white spots, C 2 with two white spots expanded posteriorly to L-shaped, subapical line with some white spots; veins mottled, mainly brown, with yellow spots (Fig. 6 F). Wing semitransparent, tinged brownish in apical quarter, and brown along veins, with subquadrate brown near middle, from anterior margin to CuA 1, another slightly darker one near base, from MP to A 1, and small oval spot at apex of CuA 2 with color lighter than first two; veins brown (Fig. 6 D). Legs yellowish, with brown stripes excluding tarsi generally brown; hind leg with fewer markings than fore and middle legs, tinged darker markings at apex of tibia (Fig. 6 B – C, E). Abdomen brown on dorsal side with many small yellow spots, and lighter on ventral side (Fig. 6 A, C). HEAD AND THORAX. Vertex with width of base 2.3 × as long as length of midline (Fig. 6 A). Antenna with pedicel about 2.6 × as long as widest portion, anterior apical angles slightly protruding (Fig. 6 A – C). Pronotum with small tubercles arranged in lines parallel with posterior margin (Fig. 6 B – C). Mesonotum with many small tubercles along three carinae (Fig. 6 A). Tegmina about 3.5 × as long as widest portion (Fig. 6 F). Metatibiotarsal formula: 5 - 8 - 6 (Fig. 6 E). MALE GENITALIA. Anal tube trapezoidal in dorsal view, with midline length about 1.4 × as long as base width (excluding basal angles), apex relatively truncated, basal half with quadrate ventral opening, lateral margins relatively straight, elevated and infolded after middle (Fig. 7 B); in lateral view, basal third relatively straight, with two basal angles protruding ventrad and dorsal process protruding dorsocaudad before turning point, apical two thirds inclined ventrad and bifurcated apically, ventral lobe smaller than dorsal lobe, paraprocts extending beyond apex of anal tube (Fig. 7 A). Pygofer rectangular in ventral view, with medioventral process subtrapezoidal and relatively truncated, apex shorter than base (Fig. 7 C). Gonostyli subrectangular in dorsal view, with apical process round and extending inwards, lamina sclerotized and C-shaped (Fig. 7 E); in lateral view, with auricular process protruding outwards, blunt and hirsutiusculus at apex (Fig. 7 D); in caudal view, apical margin irregular, shallowly concave in ventral quarter, with semicircular apical process at middle, and small hook near dorsal angle (Fig. 8 E). Phallic complex robust and broad, in dorsal view, periandrium reniform, with left margin arched outwards in postmedian portion, right margin shallowly concave from base to subapical portion, apex constricted, five characteristic processes: 1) elongate and sinuous process (P 1) originating from mid-left margin, extending before longitudinal midline; 2) broad and curved process (P 2) originating from mid-left margin, following apical portion of left margin, with apex obliquely truncated and directed right-caudad, exceeding apex; 3) very short and spinous process (P 3) originating from subapical right margin, extending caudad, with apex acute; 4) elongate and triangular process (P 4) originating from apical dorsum, extending cephalad to middle, with apex straight and acute; 5) broad and flat process (P 5) adjacent to P 4 on its right dorsal side, also originating from apical dorsum, and extending cephalad to basal third, with apex constricted and slightly curved rightwards, in additional with a small thorn near apex (Fig. 7 G). In lateral view, P 1 broad at base, abruptly constricted cephalad into hook, tapered distad and curving dorsad, P 2 chickenclaw-shaped and extending caudad, P 3 short and extending before level of P 2 apex, P 4 broad at base and gradually tapered at apex, extending dorsocephalad, P 5 broad-foliar in main portion, with small thorn at subapical portion, apex spinous and extending cephalad to middle of P 1; endosoma small; aedeagus cylindrical and sclerotized at base (Fig. 7 F, H). Fine morphology (Figs 9 – 11) General structure of the mouthparts The mouthparts of M. dehongensis sp. nov. conform to the typical piercing-sucking type observed in the Derbidae, originating posterior to the cephalic capsule and comprising three main components: 1) a cone-shaped labrum (Lm), 2) a three-segmented tubular labium (Lb), and 3) a stylet fascicle (Sf). The labrum (Fig. 9 A – B, G) arises from the apex of the anteclypeus and extends along the median longitudinal groove of the second labial segment. It measures approximately 410 μm in length and 85 μm in basal width, overlapping about one-fifth to one-quarter of the groove. The labral surface is predominantly wrinkled, except for the smooth distal apex. The labium (rostrum) features a narrow longitudinal groove (Lg) along its anterior surface (Fig. 9 A). The first segment measures 400 μm in length, with basal and apical widths of 200 μm and 270 μm, respectively. It is tubular, slightly expanded distally in posterior view (Fig. 10 D), and obscured by the clypeus (Cl) in anterior view (Fig. 9 A – B). The lateral surface exhibits slight oblique striations (Fig. 10 A). A short membranous articulation connects the first and second segments. The second segment is the longest, measuring 1255 μm in length and expanding distally to a maximum width of 295 μm. The lateral surfaces bear horizontal striae and are densely covered with numerous small papillae (pa) (Fig. 9 B – C, F). The posterior surface presents an indistinct midline groove in its distal third and an extended apical margin that overlaps the base of the third segment (Fig. 10 B, E). The anterior surface displays a slightly convex medial apical margin (Fig. 9 D – E). The third segment, the shortest, is strongly expanded distally (350 μm in length; 420 μm in width) and has longitudinal striae on its apical surface (Figs 9 E, 10 B, E). The underside bears a crater-like protrusion surrounding the stylet fascicle, with a distinct honeycomb-like surface texture (Fig. 11 A – B). The stylet fascicle is needle-like, approximately 26 μm in diameter, and dorsoventrally compressed in cross-section (Fig. 10 H). The mandibular stylets are laterally compressed, semicircular, and symmetric, with lengths approximately 2.9 – 3.0 × their maximum width, and remain separated dorsally and ventrally. The maxillary stylets form an oval-shaped bundle, enclosing a large dorsal food canal and a smaller ventral salivary canal. The maxillary connection apparatus comprises a three-locking system: (1) The dorsal lock includes four processes: on the left maxilla, the upper angular (A) and lower auricular (B); on the right, the upper quadrate (A’) and lower angular (B’); A interlocks with B’, and A’ with B. (2) The median lock involves three processes: angular processes (C, D) on the left maxilla interlocking with an auricular process (C’) on the right. (3) The ventral lock consists of an angular process (E) on the left and a blunt process (E′) on the right. Sensilla Five main types of sensilla were observed: sensillum chaetica (CH 1, CH 2, CH 3), peg-in-pit uniporous sensillum (PPSU 1, PPSU 2), sensillum basiconica (BSN 1, BSN 2), multiporous dome-shaped sensillum (DSSM), and uniporous peg sensillum (PGSU). On the labrum, one or two CH 2 occur (s) along the anterior midline (Fig. 9 G). The first labial segment bears sparse CH 3 on the posterior surface, CH 1 and CH 2 in lateral rows, and BSN 1 along the lateral margins (Fig. 10 A, D). The second segment shows several rows of CH 2 and CH 3, and numerous PPSU 1 (clustered finger-like structures in epidermal fossae) along its anterior surface (Figs 9 B – D, F, 10 J), with lateral CH 1 and CH 2 (Figs 9 H – I, 10 C), and posteriorly with CH 2, CH 3, and PPSU 1 (Fig. 10 F – G, I). The third segment has dense CH 2, CH 3, and PPSU 1 around the labial groove (Figs 9 D, 11 G), two BSN 1 at the base on the anterior surface (Figs 9 E, 11 F), sparse CH 1 laterally (Fig. 10 B), and dense CH 2 and CH 3 posteriorly (Fig. 10 B, E). The sensilla distribution at the labial tip is comparable to other derbids. The sensory structures are organized into four sensory fields: the left and right dorsal (SF-D, SF-D′) and ventral fields (SF-V, SFV′) (Fig. 11 A – B), symmetrical about the labial groove. In the dorsal right field, sensilla 1 ′ – 11 ′ form a slightly curved arc: 1 ′ – 8 ′ and 11 ′ are PGSU; 9 ′ is DSSM; 10 ′ is PPSU 2 (a smooth, finger-like structure in an epidermal fossa); 5 ′ – 8 ′ encircle 9 ′, while 10 ′ lies externally to 6 ′ and 7 ′ (Fig. 11 B – D). In the ventral field, 12 ′ and 13 ′ are BSN 2, positioned along the margin of the crater-like protrusion (Fig. 11 E). Comparative morphology The mouthparts of M. dehongensis sp. nov. are generally similar to those of Shizuka fritillaris (Boheman, 1838), Proutista moesta, Diostrombus politus, and D. gangumis in structure and sensillar composition (Brożek et al. 2006; Brożek & Bourgoin 2013 a, 2013 b; Meng & Qin 2018), but differ in several respects: (1) considerably larger overall size and surface area; (2) higher density of PPSU 1; (3) presence of a crater-like protrusion with a honeycomb-like surface at the labial tip; (4) distinct arrangement of sensilla on the labial tip; (5) slight variation in the configuration of the maxillary connection apparatus.	en	Chen, Weiqiang, Wang, Yinglun, Zhang, Yalin (2026): Three new species of the newly recorded genus Monochorhynchus Muir, 1917 from China, with observations on the fine structure of the mouthparts (Hemiptera: Fulgoromorpha: Derbidae). European Journal of Taxonomy 1043: 62-86, DOI: 10.5852/ejt.2026.1043.3205, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3205/14227
