Arcofacies longispinus, Li & Yang & Chen, 2019

Li, Hongxing, Yang, Lin & Chen, Xiangsheng, 2019, Two new species of the bamboo-feeding planthopper genus Arcofacies Muir (Hemiptera: Fulgoroidea: Delphacidae) from China, Zootaxa 4706 (2), pp. 384-390 : 387-388

Arcofacies longispinus sp. nov.

( Figs 1–12 )

Measurements. Body length including forewing: male 3.0– 3.1 mm (N = 2), forewing length: male 2.4–2.5 mm (N = 2).

Diagnosis. The salient features of the new species include the following: anal segment of male with lateroapical processes symmetrical ( Fig. 7 ); pygofer in posterior view with 4 spinous medioventral processes ( Fig. 7 ); aedeagus with long spinous process at base, apex acute, directed ventrad, middle ventral margin of aedeagus with small process ( Figs 9, 10 ); apex of genital style not forked ( Figs 11, 12 ).

Coloration. General color yellowish brown with green. Frons, vertex, pronotum and mesonotum with median carina white bordered with blackish brown ( Figs 3–5 ). Eyes yellowish to blackish brown; ocelli reddish brown. Antennae with apex of scape blackish brown, pedicel yellowish white ( Fig. 4 ). Lateral margins of gena, vertex and pronotum each with oblique white band bordered with brown or dark brown ( Figs 3, 4 ). Clypeus yellowish white ( Fig. 4 ). Forewings with pale brown over basal third, rest area hyaline, along transverse vein and apical veins with brown stripes as figured ( Fig. 6 ), in dark portion veins with white spots. Wings hyaline with brown veins. Legs yellowish brown.

Head and thorax. Vertex ( Fig. 3 ) wider at base than long submedially about 0.97: 1. Frons longer in middle line than wide at widest part about 1.25: 1, widest above ocelli. Antennae surpassing frontoclypeal suture, scape long equal to wide, shorter than pedicel about 0.38: 1 ( Fig. 4 ). Pronotum shorter than vertex about 0.50: 1. Mesonotum longer in middle line than vertex and pronotum combined about 1.55: 1 ( Fig. 3 ). Forewing longer in middle line than wide at widest part about 2.37: 1 ( Fig. 6 ).

Male genitalia. Anal segment of male short, lateroapical angles produced into stout spinous process respectively ( Fig. 7 ). Pygofer in posterior view ventral margin with four medioventral processes, finger-like ( Fig. 7 ), in lateral view ventral angles distinctly produced ( Fig. 8 ). Aedeagus with long spinous process at base, apex acute, directed ventrad, middle ventral margin of aedeagus with small process ( Figs 9, 10 ). Genital styles long, reaching ventral margin of anal segment, broad at base, narrowing to apex ( Figs 11, 12 ).

Type materials. Holotype ♂, China: Yunnan, Yingjiang County (24°´44N, 97°33´E), on bamboo, 18 Aug. 2015, Xiang-Sheng Chen; paratype, 1♂, same data as holotype, Lin Yang .

Remarks. This species is similar to A. varius sp. nov. but differs by: (1) anal segment of male with lateroapical processes symmetrical ( Fig. 7 ) (anal segment with lateroapical processes asymmetrical, left one distinctly longer than right one in A. varius sp. nov.); (2) middle ventral margin of aedeagus with small process ( Figs 9, 10 ) (middle ventral margin of aedeagus without process in A. varius sp. nov.); (3) genital styles in posterior view not distinct divergent ( Fig. 7 ) (genital styles in posterior view distinct divergent in A. varius sp. nov.).

Etymology. The specific name is a combination of the Latin words “ longus ” and “ spinus ”, referring to the aedeagus basally with a long spinous process.

Host plant. Bamboo.

Distribution. China (Yunnan).

Figures

FIGURES 1–12. Arcofacies longispinus sp. nov. 1. Male habitus, dorsal view; 2. Same, lateral view; 3. Head and thorax, dorsal view; 4. Face; 5. Frons, lateral view; 6. Forewing; 7. Male genitalia, ventral view; 8. Same, lateral view; 9. Aedeagus, left lateral view; 10. Same, right lateral view; 11. Genital style, ventral view; 12. Same, left lateral view. Scale bars: 0.5 mm (1, 2, 6); 0.2 mm (3–5, 7–12).