Dilacreon (Eluzalmon) apiculatus, 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 : 11-15

Dilacreon (Eluzalmon) apiculatus sp. nov.

( Figs 3‒5 )

Description. Body length: male 4.9‒5.0 mm (n = 2), female 5.1‒5.3 mm (n = 2).

Coloration. General color dark brown ( Fig. 3A–E ). Eyes brown, ocelli light yellow, semitransparent. Vertex generally yellow, 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 yellow, lateral areas brown to dark brown. Forewing semi-translucent; the color from the base to the end gradually darkening from brown to dark brown, with small yellowish white spots between the ends of longitudinal veins, several small dark spots scattered on the base half, stigma yellowish white. Hind tibiae yellowish brown and abdominal sternites dark brown.

Head and thorax. Vertex ( Figs 3C , 4A ) broad, 1.9 times wider than long; anterior margin slightly convex, posterior margin archedly recessed. Frons ( Figs 3D , 4B ) 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 3C , 4A ) 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. 4C ) 2.5 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: 6/9/8, second segment of hind tarsus with three platellae.

Male genitalia. Pygofer ( Fig. 4D, E ) symmetrical, dorsal margin concave and U-shaped, slightly widened towards apex in ventral view; in lateral view, lateral lobes arched caudally extended, medioventral process triangular in ventral view. Anal segment ( Fig. 4D, F ) short and wide, tubular, dorsal margin almost straight, ventral margin extremely extended, apical lobes round in lateral view; 1.6 times longer than wide in dorsal view; anal style strap-shaped, not beyond anal segment. Gonostyli ( Fig. 4D, E, G ) symmetrical in ventral view; in inner lateral view, dorsal margin bending inwards in an acute arc in the middle, apical part acute. Aedeagus ( Fig. 4H–K ) with total of five processes. The base of the ventral margin of periandrium with a medium-sized spinous process, parallel to the periandrium, and apex slightly ventrocaudally directed. Three spinous processes on the apex. The longest one on the ventral margin, slightly curved and ventrally directed; the shortest spinous processes next to the longest one, apex ventrocephalically directed; the other one on the left side, curved upwards and dorsally directed. Endosoma (=flagellum) moderately sclerotised, shorter, generally curved to the right. Apical 1/3 of dorsal margin with a long apiculate process, which curved and apex ventrocephalically directed; apex with many very thin spines.

Female genitalia. Posterior margin of pregenital sternite concave.Tergite IX ( Fig. 5A, D ) moderately sclerotised, with length almost equal to width in caudal view. Anal tube ( Fig. 5A, 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. 5E ) elongate, and slightly curved upwards. Gonapophysis IX ( Fig. 5F ) with one middle tooth, at a distance ratio, between middle tooth to apex and length of denticulate portion, of 2.4. Gonoplac ( Fig. 5G ) rod-like, 4.5 times longer than wide. Posterior vagina ( Fig. 5H, I ) elongate. The ventral wall of posterior vagina with three sclerites, which large in area and closely arranged, almost covering the entire ventral wall; two sclerites on the basal half, the left one nearly round and the right one much larger, semicircular; a nearly L-shaped sclerite on distal half of the left side. The dorsal wall with a long transverse large sclerite basally.

Type material. Holotype: ♂, CHINA: Menglun Town (21°55’N, 101°15’E), Mengla County, Yunnan Province, 27 August 2017, leg. Yan Zhi ; paratypes: 1♂ 2♀♀, same collection area as holotype, 15 June 2016, leg. Ying-Jian Wang and Qiang Luo .

Host plant. Unknown.

Distribution. China (Yunnan).

Remarks. Male genitalia of D. (E.) apiculatus sp. nov. are similar to those of D. (E.) distentus sp. nov., but differ in: (1) the base of the ventral margin of periandrium with a spinous process (the base of the ventral margin of periandrium without spinous process in D. (E.) distentus ); (2) apex of periandrium without spinous process on right side (apex of periandrium with a long spinous process on right side in D. (E.) distentus ); (3) apex of periandrium with a spinous process and base without spinous process on left side (apex of periandrium without spinous process and base with a spinous process on left side); (4) the spinous process on the apical of endosoma long and slender (the latter in the same position short and stout).

Etymology. The specific name refers to the dorsal margin of endosoma with a long apiculate process.

Figures

FIGURE 3. Dilacreon (Eluzalmon) apiculatus 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 4. Dilacreon (Eluzalmon) apiculatus 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 5. Dilacreon (Eluzalmon) apiculatus 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.