Dilacreon (Eluzalmon) distentus, 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 : 26

Dilacreon (Eluzalmon) distentus sp. nov.

( Figs 14‒15 )

Description. Body length: male 4.8‒4.9 mm (n = 3).

Coloration. General color yellowish brown ( Fig. 14A–E ). Eyes brown, ocelli light yellow, semitransparent. Vertex generally yellowish brown, carinae brown (except median carina light yellow). Face generally yellowish brown; rostrum dark brown. Pronotum with discal areas and mesonotum with area between lateral carinae yellowish white, lateral areas brown. Forewing yellowish brown, semi-translucent, with a few small blackish brown spots along Y vein and brown spots on the ends of longitudinal veins; stigma yellowish brown. Hind tibiae and abdominal sternites yellowish brown.

Head and thorax. Vertex ( Figs 14C , 15A ) broad, 2.0 times wider than long; anterior margin truncated, posterior margin archedly recessed. Frons ( Figs 14D , 15B ) widest at 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 14C , 15A ) 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. 15C ) 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 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: 6/8/8, second segment of hind tarsus with three platellae.

Male genitalia. Pygofer ( Fig. 15D, E ) symmetrical, dorsal margin concave and U-shaped; in lateral view, lateral lobes arched extended caudally, medioventral process round in ventral view. Anal segment ( Fig. 15D, F ) relative broad, in lateral view, lateral lobes rather distented, nearly quadrate, dorsal margin almost straight, ventral margin convex, apical lobes nearly right-angled in lateral view; in dorsal view, triangular, 1.3 times longer than wide; anal style strap-shaped, beyond anal segment. Gonostyli ( Fig. 15D, E, G ) symmetrical in ventral view; in inner lateral view, base of ventral margin concave, dorsal margin bending inwards in an obtuse arc in the middle, apical part with a horny process, dorsally directed. Aedeagus ( Fig. 15H–K ) with total of four processes. Apex of periandrium with two spinous processes, one on right side and the other on ventral margin, both slightly curved and cephalically directed; left side of periandrium with a broad spinous process near basal 1/3, straight, apex dorsocaudally directed. Endosoma (=flagellum) moderately sclerotised, relatively long, generally dorsally curved. Apex of dorsal margin with a short straight spinous process, apex cephalically directed; the edge with a number of tiny spikes.

Type material. Holotype: ♂, CHINA: Menglun Town (21°55’N, 101°15’E), Mengla County, Yunnan Province, 27 August 2017, leg. Yan Zhi; paratypes: 2♂♂, same data as holotype.

Host plant. Unknown.

Distribution. China (Yunnan).

Remarks. This species can be distinguished from other species of the genus by the following characters: lateral lobes of anal segment rather distent in lateral view; apex of periandrium with two spinous processes, left side of periandrium with a broad spinous process near basal 1/3; dorsal margin of endosoma with a short straight spinous process at apex.

Etymology. The specific name refers to lateral lobes of anal segment rather distented in lateral view.

Figures

FIGURE 14. Dilacreon (Eluzalmon) distentus 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 15. Dilacreon (Eluzalmon) distentus 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).