taxonID	type	description	language	source
038E878DB401FFABFF2AFB3DFA67FE88.taxon	type_taxon	Type species: Otiocerus stollii Kirby, 1821	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB402FFABFF2AFE35FC62F951.taxon	diagnosis	Diagnosis. Body fragile. Head strongly extended forward and highly compressed laterally, in lateral view, with dorsal margin straight, and junction between vertex and frons obtusely angular. Antennae elongate and nodose below eyes, with elongate, tortuous appendages at base. Tegmina very elongate, clavus open. Wings with nearly straight anterior margin.	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB402FFABFF2AFE35FC62F951.taxon	description	Description. Body oblong, small and fragile. Head large and elongate, in dorsal view, highly laterally compressed, width across eyes narrower than pronotum, lateral marginal carinae of vertex elevated and pustulate; in lateral view, strongly extended forward far beyond anterior margin of eyes, with dorsal margin straight and ventral margin curved, junction between vertex and frons obtusely angular. Postclypeus elevated centrally and compressed laterally. Rostrum inflexed, subclavate and triarticulate, with apical segment very short, reaching base of hind legs. Eyes reniform in lateral and posterior view. Ocelli small, obsolete and barely visible. Antennae located between eyes and postclypeus, subclavate, elongate and flexible, inarticulate and nodose, umbilicate at apex; with appendages emerging from base, single or double, almost as long as antenna flagellum, nodose, tortuous, and mucronate apically. Thorax subglobose. Pronotum very short at middle, posterior margin deeply concave, both lateral parts deflexed, somewhat expanded. Mesonotum subrhomboid, scutellum not clearly separated from scutum. Tegmina cuneiform and very elongate, basal cells linear, apical cells quadrate; vein MP arising from base of Sc + R fork near base; ScP + RA separating from RP near middle; CuA forked, then fused again to form a closed cell 5 (C 5); clavus open; Pcu connected with A 1 at basal third of clavus. Wings flabellate, shorter and wider than tegmina. Abdomen subtriangular, with a median longitudinal carina on dorsum. Male genitalia with phallic complex spiny on upper side and thickened at base; gonostyli forceps-like and foliar, oblong and concave, with an apical arc sinuated internally and a small sinus. Female genitalia with gonapophysis VIII notched above a large sinus; gonoplac oblong; gonapophysis IX triangular with a straight base internally.	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB402FFABFF2AFE35FC62F951.taxon	discussion	Remarks. This genus is the type genus of the tribe Otiocerini in Derbidae. It is similar to Apache Kirkaldy, 1901 and Shellenius Ball, 1928, which also have strongly compressed and produced anterad head, antenna with single or double large appendage, tegmina with ScP + RA separating from RP near middle, MP arising from base of ScP + R fork, CuA forked near middle then fused again near distal third, common stem CuA 1 + 2 reaching posterior margin, and with a subapical line. Otiocerus differs from the other two genera mainly by the straight dorsal margin of the anterior head process with a distinct angle at the junction between the vertex and frons in profile, whereas in Shellenius the head is rounded apically and in Apache the head dorsal margin is sinuate in profile (Kirby, 1821; Ball, 1928; Metcalf, 1938; Bartlett & O’Brien, 2014; Bahder et al., 2023).	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB402FFAEFF2AF941FDF6FD51.taxon	description	(Figures 1 – 25) Measurements. Body length: male (incl. tegmen): 8.5 mm (except tegmen: 4.6 mm); tegmina expanded: male: 12.8 mm. Color. Body generally brown (Figs 1, 4). Head brown, in dorsal view, lateral marginal carinae of vertex brownish, disc ivory (Fig. 2); in lateral view, with a red line below dorsal margin, and a brownish yellow band above ventral margin, rest part brown (Figs 1, 3); in ventral view, lateral marginal carinae of frons dark brown, with small light spots throughout (Fig. 4). Postclypeus pale, with median carina slightly darker (Fig. 4). Rostrum pale, with apical segment slightly darker. Eyes dark gray. Antennae with pedicel brown, with black tubercles, appendages rather lighter (Figs 1 – 4). Pronotum dark brown, with a light band at middle and another light one on each side behind dorsal margin of eyes (Figs 2, 3). Mesonotum ivory at middle and dark brown at lateral parts, with a longitudinal median carina and two lateral carinae light orange (Fig. 6). Tegmina pale grey, with brown to dark brown patches on each cell, stain-like, darker large one of which obviously on cubital cell, and darker ones on apical cells below subapical line and at apical margin of tegmina, anterior margin red in apical part, veins brown or darker (Figs 1, 7). Wings pale without obviously marks, veins brown (Figs 4, 8, 9). Legs generally white to brownish. Abdomen generally orange on dorsum and ivory on venter, with broad brown bands on dorsum excluding posterior margin of each segment, short brown bands around spiracles on venter, and somewhat orange in median of venter. Anal tube of male and gonostyli white, aedeagus white to dark brown (Figs 1, 4, 10, 12). Structure. Head large and elongate, in dorsal view, vertex widest at base, with lateral marginal carinae almost parallel, disc depressed without median carina, posterior margin slightly concave (Fig. 2); in lateral view, extremely extending forward, more than four times width of eye, with dorsal margin straight, ventral margin straight in basal half and curved dorsad in apical half, junction between vertex and frons sharply angular (Figs 1, 3); in ventral view, lateral marginal carinae distinctly developed and contiguous almost throughout, except for apical third part slightly separated (Fig. 4). Postclypeus significantly shorter than frons in length, nearly triangular, with a distinct longitudinal median carina (Figs 3, 4). Rostrum somewhat short and thick, about equal to postclypeus in length, extended slightly beyond coxae of hind legs, with apical segment short and slightly expanded (Figs 3, 4). Eyes large, with ventroposterior margin concave. Ocelli barely visible. Antennae very elongate, with scape slender, pedicel elongate and extending forward, about three fifths of frons in length, appendages double and U-shaped at base, each branch slightly shorter than pedicel in length (Figs 1 – 4). Thorax. Pronotum extremely short at middle, anterior margin roundly convex and posterior margin deeply concave (Fig. 2). Mesonotum large and subrhomboid, elevated on disc, depressed on lateral and posterior parts, with a feeble vertical median carina and two lateral ones (Fig. 6). Tegmina narrow and elongate, anterior margin slightly arched, posterior margin straight in basal half and arched in apical half, with an emargination near apex, apical margin round; vein Pc + CP relatively obvious about basal quarter and forming a narrow and long costal area with CA, then fused with CA in remaining part; ScP + RA separating from RP at basal third of tegmina, before CuA forking; ScP + RA two-branched at terminal, with anterior part of trunk and branches slightly thickening due to minutely vesicular sclerotization; RP three-branched at terminal; MP with MP 4 and MP 3 both single, MP 2 two-branched and MP 1 four-branched, altogether eight branches at terminal; CuA forked near basal third, and fused again near about apical third to form closed Cell 5 (C 5 = procubital cell); clavus open and extremely elongate, extremely narrow basally and expanded apically, spear-like; Cell 1 - 5 all elongate (Figs 7, 20). Wings flabellate, anterior margin nearly straight except for slightly convex near middle, posterior margin curved, apical margin narrowly round, with a stridulatory plate bearing a concave external margin on jugal margin; ScP + RA separating from RP at about middle, MP single, CuA three-branched (Figs 8, 9, 21). Metatibiotarsal formula: 5 - 4 - 2 (Fig. 5). Male genitalia. Anal tube elongate, about equal to gonostylus in length, in dorsal view, subrectangular, widest at base and constricted distad, lateral margin slightly incurved near middle, with anal stylus triangle at apex (Fig. 11); in lateral view, dorsal margin straight, ventral lateral margin arched ventrocaudad in most of central part, deeply roundly concave near apex and convex ventrad at apex, epiproct short and paraproct long (Figs 10, 13). Pygofer narrow, in lateral view, widest at ventral margin and narrow dorsally, anterior margin slightly concave in central part, with laterodorsal angles obtusely rounded, not produced (Figs 10, 13); in ventral view, anterior margin straight, posterior margin slightly convex at middle, without medioventral process. Gonostylus long and broad, in dorsal view, incurved apically, outer margin relatively smooth, inner margin sinuated with an obvious angular protrusion near middle, with basal lamina round and slightly emarginate at middle (Figs 11, 15, 22); in lateral view, nearly scoop-like, sharply constricted and upcurved apically, dorsal margin relatively straight and stout with narrow hirsute membrane, with a large internal arched process at dorsal apex, bearing a small spine at base, ventral margin somewhat sinuated; anterior part of gonostylus nearly straight in lateral view, about quarter of gonostylus in length (Figs 10, 12, 13, 16, 23). Phallic complex moderately broad and long, in lateral view, periandrium slightly constricted distad, dorsal margin with two slight protuberances bearing many small thorns at apex in right view, ventral margin with a median longitudinal membrane protruded from subapical portion (Figs 18, 19, 24); with two long processes, and two double-layered folding membranes (opening towards right) at apex, in right lateral view: 1) a folding membrane (M 1) at top with apical margin of dorsal layer protruding cephalad and finger-like, 2) a long needle-like process (P 1) extending cephalad, 3) a long cane-like process (P 2) extending cephalad, and curved downwards at apex, 4) a large folding membrane (M 2) strongly extended cephalad beneath three sclerotized processes, dorsal margin almost reaching base of periandrium (Figs 19, 24); in dorsal view: 1) P 1 broad and slightly directed towards right basally, pointed and curved cephalad apically, 2) M 2 very broad with dorsal layer extending further than ventral layer, 3) P 2 broad basally and constricted to needle-like apically, 4) M 1 with dorsal layer extending further than ventral layer, and dorsal margin protruded in finger-like at middle (Figs 17, 25).	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB402FFAEFF2AF941FDF6FD51.taxon	materials_examined	Type material. Holotype: ♂ (INHS), EI Yunque National Forest, Puerto Rico, 18.29421 ° N, 65.79121 ° W, 750 m, 17 – 29 October 2012, coll. CH Dietrich, BO Morris, Malaise trap.	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB402FFAEFF2AF941FDF6FD51.taxon	etymology	Etymology. The specific epithet refers to the red horizontal submarginal line on the frontal process of the head.	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB402FFAEFF2AF941FDF6FD51.taxon	discussion	Remarks. This species agrees well with the genus description, including the head shape (Figs 1 – 3) and tegminal venation (Figs 7, 20). It is significantly different from the previously known species of Otiocerus by its unique color pattern and by the male genitalia.	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB407FFAEFF2AFD41FD89FCE7.taxon	materials_examined	Type species: Shellenius ballii (McAtee, 1923)	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB407FFAEFF2AFC12FE6AFB6E.taxon	discussion	Remarks. Fennah (1952: 154) distinguished Otiocerus from Shellenius, characterizing the former by the “ head in profile angulate at apex ”, and the latter by the “ head in profile rounded at apex ”. Curiously, this species, described by Fennah (1952: 156) in the same publication, exhibits a “ head in profile broadly rounded at apex ”, which is more similar to Shellenius than to Otiocerus. Accordingly, Shellenius fontis comb. nov. (= Otiocerus fontis Fennah, 1952: 156) is proposed here.	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
038E878DB407FFAEFF2AFA9CFCE8F995.taxon	discussion	Remarks. This species was described by Fennah (1952: 156) also exhibits a “ head in profile broadly rounded at apex ”, which is more similar to Shellenius than to Otiocerus. Furthermore, Fennah (1952: 157) mentioned that this species resembled O. griseus Fowler in the shape of the head in profile, but the latter species has already been transferred to the genus Shellenius by Metcalf (1945: 185). Accordingly, Shellenius lyncaeste comb. nov. (= Otiocerus fontis Fennah, 1952: 156) is proposed here.	en	Chen, Weiqiang, Dietrich, Christopher H., Zhang, Yalin (2025): On the genus Otiocerus with a new species and two new combinations to Shellenius (Hemiptera: Fulgoromorpha: Derbidae). Zootaxa 5633 (3): 553-563, DOI: 10.11646/zootaxa.5633.3.8, URL: https://doi.org/10.11646/zootaxa.5633.3.8
