Dilacreon (Eluzalmon) parapentagonus, 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 : 37-43

Dilacreon (Eluzalmon) parapentagonus sp. nov.

( Figs 24‒26 )

Description. Body length: male 4.6‒5.0 mm (n = 4), female 4.9‒5.5 mm (n = 3).

Coloration. General color yellowish brown ( Fig. 24A–E ). Eyes dark brown, ocelli light yellow, semitransparent. Vertex generally yellowish brown with carinae light brown. Face generally brown; rostrum yellowish brown. Pronotum and mesonotum brown. Forewing brown, semi-translucent; stigma yellowish brown. Hind tibiae and abdominal sternites yellowish brown.

Head and thorax. Vertex ( Figs 24C , 25A ) broad, 2.2 times wider than long; anterior margin truncated, posterior margin archedly recessed. Frons ( Figs 24D , 25B ) widest slightly below the level of antennae, 1.2 times as long as wide; frontoclypeal suture nearly concave into an arch; middle carina complete; lateral carinae distinct and slightly elevated. Pronotum ( Figs 24C , 25A ) 2.5 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. 25C ) 2.4 times longer than wide, with 10 apical and 6 subapical cells; fork Sc+RP slightly basad of fork CuA 1 +CuA 2, first crossvein r-m at same level as 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 basad of fork MP 3 +MP 4. Metatibiotarsal formula: 6/7/8, second segment of hind tarsus with three platellae.

Male genitalia. Pygofer ( Fig. 25D, E ) symmetrical, dorsal margin concave and U-shaped, slightly widened towards apex in ventral view; in lateral view, lateral lobes arched extended caudally, medioventral process arched in ventral view. Anal segment ( Fig. 25D, F ) tubular, dorsal and ventral margins almost straight, apical lobes horny in lateral view; 1.7 times longer than wide in dorsal view; anal style strap-shaped, slightly beyond anal segment. Gonostyli ( Fig. 25D, E, G ) symmetrical in ventral view; in inner lateral view, base of ventral margin nearly straight, dorsal margin bending inwards at a nearly right angle in the middle, apical part extended, apical margin round. Aedeagus ( Fig. 25H–K ) with total of five processes. On right side, apex of periandrium with two curved spinous processes, the upper one medium-sized, cephalically directed, the lower one longer, apex left-ventrocephalically directed; apical half of ventral margin swollen triangularly, basal half of periandrium densely covered with fine denticles; left apex with a longest spinous process, sinuous, which basal half slightly curved downwards and apical half straight, ventrocephalically directed. Endosoma (=flagellum) moderately sclerotised, relatively short, generally dorsally curved. Base of left side with a medium-sized spinous process, slightly curved and left-cephalically directed; dorsal margin near apex with a short spinous process, straight, apex ventrocephalically directed.

Female genitalia. Posterior margin of pregenital sternite concave.Tergite IX( Fig. 26A, D ) moderately sclerotised, 1.2 times longer than wide in caudal view. Anal tube ( Fig. 26A, C ) short, nearly rectangular, slightly widened towards apex, 1.1 times wider than long in dorsal view; dorsal and ventral margins slightly convex in lateral view, anal styles strap-shaped. Gonapophysis VIII ( Fig. 26E ) elongate, and slightly curved upwards. Gonapophysis IX ( Fig. 26F ) with one middle tooth, at a distance ratio, between middle tooth to apex and length of denticulate portion, of 1.7. Gonoplac ( Fig. 26G ) rod-like, 3.8 times longer than wide. Posterior vagina ( Fig. 26H, I ) elongate. The ventral wall of posterior vagina with a longitudinal long and slender sclerite on left side. The base of dorsal wall with a large near-elliptical sclerite and a smaller sclerite on the left, the right side of the middle area with two longitudinal narrow sclerites.

Type material. Holotype: ♂, CHINA: Fenshuiling National Nature Reserve (22°46’N, 103°13’E), Jinping County, Yunnan Province, 5 August 2015, leg. Zhi-Min Chang; paratypes: 2♂♂ 1♀, Bakaxiaozhai (21°58’N, 101°13’E), Mengla County, Yunnan Province, 20‒30 July 2012, leg. Wei-Bin Zheng and Shi-Yan Xu; 1♂, Bakaxiaozhai , Mengla County, Yunnan Province, 14 June 2016, leg. Liang-Jing Yang; 2♀♀, Bakaxiaozhai , Mengla County, Yunnan Province, 11 March 2017, leg. Zheng-Xue Zhao.

Host plant. Unknown.

Distribution. China (Yunnan).

Remarks. Male genitalia of D. (E.) parapentagonus sp. nov. are similar to those of D. (E.) pentagonus Fennah, 1980 , but differ in: (1) left apex of periandrium with one spinous process (left apex of periandrium with two spinous processes in D. (E.) pentagonus ); (2) left side of endosoma with a medium-sized spinous process basally (left side of endosoma without process basally in D. (E.) pentagonus ); (3) vertex with middle carina, anterior margin transverse (vertex without middle carina, anterior margin angulate in D. (E.) pentagonus ); (4) forewing without crossvein CuA 1 -CuA 2 (Cu 1a -Cu 1b) (the latter with crossvein Cu A1 -Cu A2 (Cu 1a -Cu 1b )).

Etymology. The specific name refers to the number and location of aedeagal spinous processes of this new species which is similar to D. (E.) pentagonus Fennah, 1980 .

Figures

FIGURE 24. Dilacreon (Eluzalmon) parapentagonus 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 25. Dilacreon (Eluzalmon) parapentagonus 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 26. Dilacreon (Eluzalmon) parapentagonus 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.