Dilacreon (Eluzalmon) transversus, 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 : 43-47

Dilacreon (Eluzalmon) transversus sp. nov.

( Figs 27‒29 )

Description. Body length: male 5.2‒5.5 mm (n = 16), female 5.4‒5.8 mm (n = 27).

Coloration. General color yellowish brown ( Fig. 27A–F ). Eyes blackish brown, ocelli light yellow, semitransparent. Vertex generally yellow. Face and rostrum yellow. Pronotum yellowish brown, mesonotum with area between lateral carinae yellowish brown, lateral areas slightly darker. Forewing yellowish brown, semi-translucent; stigma yellowish brown. Hind tibiae and abdominal sternites yellowish brown.

Head and thorax. Vertex ( Figs 27C , 28A ) broad, 2.2 times wider than long; anterior margin truncated, posterior margin archedly recessed. Frons ( Figs 27D , 28B ) 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 27C , 28A ) 2.2 times longer than vertex; median carina indistinct, posterior margin nearly at right angle. Mesonotum 1.9 times longer than pronotum and vertex combined. Forewing ( Fig. 28C ) 2.7 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 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 basad of fork MP 3 +MP 4. Metatibiotarsal formula: 6/6/8, second segment of hind tarsus with two to three platellae.

Male genitalia. Pygofer ( Fig. 28D, E ) symmetrical, dorsal margin concave and U-shaped, slightly widened towards apex and concaved medially in ventral view; in lateral view, lateral lobes arched extended caudally, medioventral process round in ventral view. Anal segment ( Fig. 28D, F ), tubular, dorsal and ventral margin almost straight, apical lobes finger-like in lateral view; 1.5 times longer than wide in dorsal view; anal style strap-shaped, beyond anal segment. Gonostyli ( Fig. 28D, E, G ) symmetrical in ventral view; in inner lateral view, base of ventral margin slightly concave, dorsal margin bending inwards in an acute angle in the middle, apical part extended, apical margin round. Aedeagus ( Fig. 28H–K ) with total of five processes. The apex of ventral margin of periandrium with a large smooth laminal protrusion, nearly triangular; the right apex with a large spinous process, basal 2/3 parallel to the periandrium, apical 1/3 bent to the left through a strong arc over the dorsal margin of periandrium; the left basal 1/3 of periandrium with a short spinous process, slightly curved and left-dorsocaudally directed. Endosoma (=flagellum) moderately sclerotised, long, generally dorsally curved. Left side with a medium-sized spinous process basally, apex left-cephalically directed; left apex with a small spinous process, slightly curved and left-ventrocephalically directed.

Female genitalia. Posterior margin of pregenital sternite concave. Tergite IX ( Fig. 29A, D ) moderately sclerotised, 1.1 times wider than long in caudal view. Anal tube ( Fig. 29A, C ) short, nearly rectangular, 1.2 times longer than wide in dorsal view; dorsal and ventral margins nearly straight in lateral view, anal styles strap-shaped. Gonapophysis VIII ( Fig. 29E ) elongate, and slightly curved upwards. Gonapophysis IX ( Fig. 29F ) with one middle tooth, at a distance ratio, between middle tooth to apex and length of denticulate portion, of 1.8. Gonoplac ( Fig. 29G ) rod-like, 3.7 times longer than wide. Posterior vagina ( Fig. 29H, I ) elongate. The sclerites located only at the base. The left and right sides of ventral wall with one small long sclerite and the left side of dorsal wall with one small round sclerite.

Type material. Holotype: ♂, CHINA: Daweishan National Nature Reserve (22°35’N, 103°20’E), Pingbian County, Yunnan Province, 8 August 2014, leg. Ying-Jian Wang; paratypes: 1♂, same data as holotype; 2♂♂ 6♀♀, same collection area as holotype, 4‒5 June 2016, leg. Ying-Jian Wang and Qiang Luo; 10♂♂ 19♀♀, same collection area as holotype, 18‒20 August 2017, leg. Yan Zhi, Qiang Luo, Nian Gong and Yong-Jin Sui; 2♂♂ 2♀♀, Gulinqing Town (22°48’N, 103°57’E), Maguan County, Yunnan Province, 1 June 2016, leg. Ying-Jian Wang and Liang-Jing Yang.

Host plant. Unknown.

Distribution. China (Yunnan).

Remarks. Male genitalia of D. (E.) transversus sp. nov. are similar to those of D. (E.) pentagonus Fennah, 1980 , but differ in: (1) the right apex with a large spinous process, apical 1/3 bent to the left through a strong arc over the dorsal margin of periandrium (the spinous processes on the right apex not bent to the left in D. (E.) pentagonus ); (2) the left basal 1/3 of periandrium with a short spinous process (the left basal 1/3 of periandrium without short spinous process in D. (E.) pentagonus ); (3) left apex of periandrium without spinous process (the latter with two long spinous processes in the same position).

Etymology. The specific name refers to the right apex of periandrium with a large transverse spinous process which bent to the left.

Figures

FIGURE 27. Dilacreon (Eluzalmon) transversus 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. F. Hindwing. Scale bars: 0.5 mm.

FIGURE 28. Dilacreon (Eluzalmon) transversus 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 29. Dilacreon (Eluzalmon) transversus 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.