Dilacreon (Eluzalmon) biprocessus, Chen & Zhi, 2023

Chen, Xiang-Sheng & Zhi, Yan, 2023, Taxonomic study of the Eucarpiini (Hemiptera: Fulgoromorpha: Cixiidae) from China, Zootaxa 5347 (1), pp. 1-100 : 18-22

Dilacreon (Eluzalmon) biprocessus sp. nov.

( Figs 8‒10 )

Description. Body length: male 4.6‒4.8 mm (n = 4), female 5.0‒ 5.3 mm (n = 3).

Coloration. General color brown ( Fig. 8A–E ). Eyes dark brown, ocelli brown, semitransparent. Vertex generally brown with carinae yellowish brown. Face generally brown; rostrum light brown. Pronotum and mesonotum brown with yellowish white carinae. Forewing yellowish brown, translucent, the basal half with dorsal and ventral margins dark brown, an oblique dark brown stripe near basal cell and another arising from Y fork to middle of CuA 1, three small dark brown spots located on CuA fork, the middle of CuA 2 and M veins, the apical half of forewing with a broad V-shaped stripe light yellowish brown and other stripes along transverse veins, RP 1 and RP 2; stigma yellowish brown. Hind tibiae yellowish brown and abdominal sternites dark brown.

Head and thorax. Vertex ( Figs 8C , 9A ) broad, 2.1 times wider than long; anterior margin slightly convex, posterior margin archedly recessed. Frons ( Figs 8D , 9B ) widest slightly below the level of antennae, 1.2 times as wide as long; frontoclypeal suture nearly concave into an arch; middle carina complete; lateral carinae distinct and slightly elevated. Pronotum ( Figs 8C , 9A ) 2.0 times longer than vertex; median carina indistinct, posterior margin nearly at right angle. Mesonotum 1.7 times longer than pronotum and vertex combined. Forewing ( Fig. 9C ) 2.1 times longer than wide, with 9 apical and 5 subapical cells; fork Sc+RP slightly distad of fork CuA 1 +CuA 2, first crossvein r-m slightly basad of fork MP, RP two branches, MP with five terminals: MP 11, MP 12, MP 2, MP 3, and MP 4, fork MP 1 +MP 2 distad of fork MP 3 +MP 4. Metatibiotarsal formula: 6/7/8, second segment of hind tarsus with three platellae.

Male genitalia. Pygofer ( Fig. 9D, E ) symmetrical, dorsal margin concave and U-shaped, slightly concaved medially in ventral view; in lateral view, lateral lobes arched extended caudally, medioventral process round in ventral view. Anal segment ( Fig. 9D, F ) tubular, dorsal margin almost straight, apical 3/4 of ventral margin slightly convex, apical lobes finger-like in lateral view; 2.0 times longer than wide in dorsal view; anal style strap-shaped, slightly beyond anal segment. Gonostyli ( Fig. 9D, E, G ) symmetrical in ventral view; in inner lateral view, base of ventral margin nearly straight, dorsal margin bending inwards in an obtuse arc in the middle, apical part with a small spike dorsocaudally directed. Aedeagus ( Fig. 9H–K ) with total of five processes. Periandrium with a short spinous process positioning slightly to dorsal margin of its right side in the middle, slightly curved and right-dorsocephalically directed; apex with a long spinose process positioning slightly to dorsal margin of its left side, curved and ventrocephalically directed. Endosoma (=flagellum) moderately sclerotised, relatively long, generally dorsally curved. Dorsal margin with a long spinous process basally, slightly curved, apex dorsocephalically directed; apex with two long spinous processes, the upper one ventrocephalically directed and the lower one right-ventrocephalically directed.

Female genitalia. Posterior margin of pregenital sternite concave. Tergite IX ( Fig. 10A, D ) moderately sclerotised, with length almost equal to width in caudal view. Anal tube ( Fig. 10A, C ) short, nearly rectangular, 1.1 times longer than wide in dorsal view; dorsal and ventral margins nearly straight in lateral view, anal styles strap-shaped. Gonapophysis VIII ( Fig. 10E ) elongate, and slightly curved upwards. Gonapophysis IX ( Fig. 10F ) with one middle tooth, at a distance ratio, between middle tooth to apex and length of denticulate portion, of 2.4. Gonoplac ( Fig. 10G ) rod-like, 4.5 times longer than wide. Posterior vagina ( Fig. 10H, I ) elongate. The ventral wall of posterior vagina with a long sclerite in the middle area and a very small sclerite the left side basally.

Type material. Holotype: ♂, CHINA: Wuzhishan National Nature Reserve (18°54’N, 109°41’E), Wuzhishan City , Hainan Province, 18 May 1997, leg. Mao-Fa Yang ; 3♂♂ 3♀♀, Beibeng Township (29°14’N, 95°11’E), Motuo County, Tibet Autonomous Region, 15 August 2020, leg. Yong-Jin Sui.

Host plant. Unknown.

Distribution. China (Hainan, Tibet).

Remarks. Male genitalia of D. (E.) biprocessus sp. nov. are similar to those of D. (E.) chionomus Fennah, 1980 , but differ in: (1) the left side of periandrium without spinous process in the middle (in D. (E.) chionomus , the left side of periandrium with a spinous process in the middle); (2) dorsal margin of endosoma with a long spinous process basally (the latter with two spinous processes on the right side of periandrium basally); (3) endosoma without spinous process in the middle and with two spinous processes at apex (the latter with one spinous process in the middle and at apex).

Etymology. The specific name refers to the apex of endosoma with two spinous processes.

Figures

FIGURE 8. Dilacreon (Eluzalmon) biprocessus sp. nov., male. A. Habitus, dorsal view; B. Habitus, lateral view; C. Head and thorax, dorsal view; D. Face, ventral view; E. Head, lateral view. Scale bars: 0.5 mm.

FIGURE 9. Dilacreon (Eluzalmon) biprocessus sp. nov., male. A. Head and thorax, dorsal view; B. Face, ventral view; C. Forewing; D. Genitalia, lateral view; E. Pygofer and gonostyli, ventral view; F. Anal segment, dorsal view; G. Gonostyli, inner lateral view; H. Aedeagus, right side; I. Aedeagus, left side; J. Aedeagus, dorsal view; K. Aedeagus, ventral view. Scale bars: 0.5 mm (A, B, D–K); 1.0 mm (C).

FIGURE 10. Dilacreon (Eluzalmon) biprocessus sp. nov., female.A. Genitalia, lateral view; B. Genitalia, ventral view; C.Anal segment, dorsal view; D. Tergite IX, caudal view; E. Gonapophysis VIII and gonocoxa VIII, ventral view; F. Gonapophysis IX, lateral view; G. Gonoplac, lateral view; H. Posterior vagina, ventral view; I. Posterior vagina, dorsal view. Scale bars: 0.5 mm.