Dilacreon (Dilacreon) deltodontus, 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 : 8-11

Dilacreon (Dilacreon) deltodontus sp. nov.

( Figs 1‒2 )

Description. Body length: male 4.3‒4.8 mm (n = 4), female 5.5 mm (n = 2).

Coloration. General color dark brown ( Fig. 1A–E ). Eyes dark brown, ocelli light yellow, semitransparent. Vertex generally brown, carinae darker (except median carina light yellow). Face generally dark brown, densely covered with small light spots; rostrum light brown. Pronotum brown; mesonotum with area between lateral carinae brown, lateral areas darker. Forewing dark brown, semi-translucent; the basal half with several irregular brown spots and terminal with small yellowish white spots between the ends of longitudinal veins, stigma yellowish white. Hind tibiae light brown and abdominal sternites dark brown.

Head and thorax. Vertex ( Figs 1C , 2A ) broad, 2.0 times wider than long; anterior margin truncated, posterior margin archedly recessed. Frons ( Figs 1D , 2B ) widest at the level of antennae, 1.1 times as wide as long; frontoclypeal suture nearly concave into an arch; middle carina with basal half absent; lateral carinae distinct and slightly elevated. Pronotum ( Figs 1C , 2A ) 2.2 times longer than vertex; median carina indistinct, posterior margin nearly at right angle. Mesonotum 1.6 times longer than pronotum and vertex combined. Forewing ( Fig. 2C ) 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: 6/7/7‒8, second segment of hind tarsus with three platellae.

Male genitalia. Pygofer ( Fig. 2D, 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 nearly triangular in ventral view. Anal segment ( Fig. 2D, F ) broad, dorsal margin almost straight, ventral margin arched apically extended, apical lobes round in lateral view; 1.2 times longer than wide in dorsal view; anal style finger-like, not beyond anal segment. Gonostyli ( Fig. 2D, E, G ) symmetrical in ventral view; in inner lateral view, dorsal margin bending inwards in a circular arc in the middle, apical part with a small process. Aedeagus ( Fig. 2H–K ) with total of five processes. Right basal 1/3 of periandrium with a small triangular process; apex with a long straight spinous process, dorsocephalically directed. Ventral margin of periandrium with medium-sized spinous process, slightly curved and ventrocaudally directed. Left side with a long straight spinous process apically, apex dorsocephalically directed. Endosoma (=flagellum) moderately sclerotised, relatively long, generally dorsally curved. Dorsal margin with a long spinous process apically, slightly curved and ventrocephalically directed; the edge with a number of tiny spikes.

Type material. Holotype:♂, CHINA: Diaoluoshan National Forest Park (18°44’N, 109°50’E), Lingshui County, Hainan Province, 25 April 2014, leg. Jian-Kun Long ; paratypes: 3♂♂ 1♀, Houmiling Nature Reserve (18°56’N, 109°3’E), Dongfang City, Hainan Province, 9 May 2017, leg. Ying-Jian Wang ; 1♀, Wuzhishan National Nature Reserve , the second peak(18°54’N, 109°41’E), Wuzhishan City, Hainan Province, 20April 2017, leg. Ying-Jian Wang .

Host plant. Unknown.

Distribution. China (Hainan).

Remarks. Male genitalia of D. (D.) deltodontus sp. nov. are similar to those of D. (D.) orpheus (Fennah, 1956) , but differ in: (1) right apex of periandrium with one spinose process (the latter with two spinose processes); (2) ventral margin of periandrium with a curved spinous process (the latter without the same spinose process); (3) endosoma with a long spinous process and a number of tiny spikes apically (endosoma with a short slender spine on right side one-third from apex, and a small spine on left ventral margin one-quarter from apex in D. (D.) orpheus ).

Etymology. The specific name refers to the right side of periandrium with an extremely short triangular spinose process.

Figures

FIGURE 1. Dilacreon (Dilacreon) deltodontus 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 2. Dilacreon (Dilacreon) deltodontus 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).