Dilacreon (Eluzalmon) erectus, 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 : 29

Dilacreon (Eluzalmon) erectus sp. nov.

( Figs 16‒18 )

Description. Body length: male 5.5 mm (n = 1), female 6.0 mm (n = 1).

Coloration. General color yellowish brown ( Fig. 16A–E ). Eyes brown, ocelli light yellow, semitransparent. Vertex generally yellowish brown with carinae lighter. Face generally yellowish brown; rostrum light brown. Pronotum with discal areas and mesonotum with area between lateral carinae yellowish brown, lateral areas brown. Forewing yellowish brown, semi-translucent, with the ventral margin yellowish white, outer margin dark brown, and small long light brown spots between the ends of longitudinal veins; stigma dark brown. Hind tibiae yellowish brown and abdominal sternites dark brown.

Head and thorax. Vertex ( Figs 16C , 17A ) broad, 2.3 times wider than long; anterior margin truncated, posterior margin archedly recessed. Frons ( Figs 16D , 17B ) widest slightly below the level of antennae, 1.1 times as long as wide; frontoclypeal suture nearly concave into an arch; middle carina complete; lateral carinae distinct and slightly elevated. Pronotum ( Figs 16C , 17A ) 2.6 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. 17C ) 2.4 times longer than wide, with 10 apical and 6 subapical cells; fork Sc+RP 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 three platellae.

Male genitalia. Pygofer ( Fig. 17D, E ) symmetrical, dorsal margin concave and U-shaped in ventral view; in lateral view, lateral lobes triangularly extended caudally, medioventral process triangular in ventral view. Anal segment ( Fig. 17D, F ) tubular, dorsal margin almost straight, apical half of ventral margin slightly convex, apical lobes finger-like in lateral view; 1.7 times longer than wide in dorsal view; anal style strap-shaped, not beyond anal segment. Gonostyli ( Fig. 17D, E, G ) symmetrical in ventral view; in inner lateral view, base of ventral margin slightly concave, dorsal margin bending inwards in a right-angle arc in the middle, apical part extended, apical margin round. Aedeagus ( Fig. 17H–K ) with total of four processes. On right side, base of periandrium with a longest spinous process, basal half straight and apical half slightly curved, apex ventrocephalically directed; basal half of ventral margin with 1 broad triangular spinous process, densely covered with denticles, apex ventrocaudally directed. Endosoma (=flagellum) moderately sclerotised, relatively long, generally curved dorsally. Base with a short spinous process, basal part slight broad, erect, apex dorsally directed; left side with a slender spinous process in the middle, slightly curved and ventrocephalically directed.

Female genitalia. Tergite IX ( Fig. 18A, D ) moderately sclerotised, with length almost equal to width in caudal view. Anal tube ( Fig. 18A, 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. 18E ) elongate, and slightly curved upwards. Gonapophysis IX ( Fig. 18F ) with one middle tooth, at a distance ratio, between middle tooth to apex and length of denticulate portion, of 1.8. Gonoplac ( Fig. 18G ) rod-like, 3.8 times longer than wide. Posterior vagina ( Fig. 18H, I ) elongate. The sclerites located only at the base. One nearly oval sclerite on the left and right sides of the ventral wall; two bean-shaped sclerites in the middle of the dorsal wall, and the larger one on the right; four small near-circular sclerites at the right base, arranged in an oblique row.

Type material. Holotype: ♂, CHINA: Gulinqing Town (22°48’N, 103°57’E), Maguan County, Yunnan Province, 1 June 2016, leg. Ying-Jian Wang; paratype: 1♀, same data as holotype.

Host plant. Unknown.

Distribution. China (Yunnan).

Remarks. Male genitalia of D. (E.) erectus sp. nov. are similar to those of D. (E.) salma Fennah, 1980 , but differ in: (1) the dorsal base of endosoma with an erect spinous process (the latter without erect spinous process in the same position); (2) dorsal margin of periandrium without spinous process (the latter with two small spinous processes on dorsal margin of periandrium); (3) the apex of endosoma without spinous process (the apex of endosoma with a spinous process in D. (E.) salma ).

Etymology. The specific name refers to the base of endosoma with a short erect spinous process.

Figures

FIGURE 16. Dilacreon (Eluzalmon) erectus 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 17. Dilacreon (Eluzalmon) erectus 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 18. Dilacreon (Eluzalmon) erectus 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.