Dilacreon (Eluzalmon) arcuatus, 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 : 15-18

Dilacreon (Eluzalmon) arcuatus sp. nov.

( Figs 6‒7 )

Description. Body length: male 4.8 mm (n = 1).

Coloration. General color brown ( Fig. 6A–E ). Eyes brown, ocelli light yellow, semitransparent. Vertex generally yellowish brown, carinae brown (except median carina light yellow). Face generally yellowish brown; rostrum light brown. Pronotum with discal areas and mesonotum with area between lateral carinae yellowish brown, lateral areas darker. Forewing light brown, semi-translucent; the basal half with several small brown spots, distal half with a wide V-shaped brown band and small brown spots on the ends of longitudinal veins, stigma yellowish brown. Hind tibiae yellowish brown and abdominal sternites dark brown.

Head and thorax. Vertex ( Figs 6C , 7A ) broad, 2.9 times wider than long; anterior margin truncated, posterior margin archedly recessed. Frons ( Figs 6D , 7B ) widest slightly below the level of antennae, 1.3 times as wide as long; frontoclypeal suture nearly concave into an arch; middle carina complete; lateral carinae distinct and slightly elevated. Pronotum ( Fig. 6C , 7A ) 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. 7C ) 2.6 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: 6/7/8, second segment of hind tarsus with two platellae.

Male genitalia. Pygofer ( Fig. 7D, E ) symmetrical, dorsal margin concave and U-shaped, slightly widened towards apex in ventral view; in lateral view, lateral lobes triangular, caudally extended, medioventral process round in ventral view. Anal segment ( Fig. 7D, F ) tubular, dorsal margin almost straight, ventral margin arched extended in the middle, apical lobes finger-like in lateral view; 1.5 times longer than wide in dorsal view; anal style strap-shaped, not beyond anal segment. Gonostyli ( Fig. 7D, E, G ) symmetrical in ventral view; in inner lateral view, dorsal margin bending inwards in a circular arc in the middle, apical part round. Aedeagus ( Fig. 7H–K ) with total of five processes. An arcuate spinous process on the right of periandrium near apex, ventrally directed; apical 1/2 of the ventral margin slightly bulged, basal 1/2 with a triangular short and wide process, densely covered with fine denticles, apex ventrocaudally directed; dorsal margin with a sinuous spinous process in the middle, apex dorsally directed. Endosoma (=flagellum) moderately sclerotised, relatively long, generally left-dorsally curved. Dorsal margin with a short slender process, nearly straight, apex right-dorsocephalically directed. Left apex with a medium-sized spinous process, straight, apex ventrocephalically directed.

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

Host plant. Unknown.

Distribution. China (Yunnan).

Remarks. Male genitalia of D. (E.) arcuatus sp. nov. are similar to those of D. (E.) erectus sp. nov., but differ in: (1) dorsal margin of periandrium with a sinuous process in the middle (the latter without sinuous process in the same position); (2) endosoma without spinous process basally (endosoma with a spinous process basally in D. (E.) erectus ); (3) apex of endosoma with a sinuous process (the latter without spinous process in the same position).

Etymology. The specific name refers to the right side of periandrium with an arcuate spinous process near apex.

Figures

FIGURE 6. Dilacreon (Eluzalmon) arcuatus 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 7. Dilacreon (Eluzalmon) arcuatus 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).