Isoscelipteron acuticaudatum, Li & Aspöck & Aspöck & Liu, 2018

Li, Di, Aspöck, Horst, Aspöck, Ulrike & Liu, Xingyue, 2018, A review of the beaded lacewings (Neuroptera: Berothidae) from China, Zootaxa 4500 (2), pp. 235-257 : 252-255

Isoscelipteron acuticaudatum sp. nov.

( Figs. 11 , 33–34 )

Diagnosis. The new species is characterized by the male tergum 9 + ectoprocts with posterodorsal portion nearly right-angled and with posteroventral portion slightly elongated and tapering, the fused gonocoxites 11 (= gonarcus) medially with a ring-shaped lobe, and the torulus broadly arched.

Description. Male. Body length 7.0– 7.5 mm; forewing length 9.0–10.0 mm, hindwing length 7.0–10.0 mm.

Head generally brownish yellow with yellowish setae, but setae on frons and clypeus dark brown. Compound

eyes blackish brown. Antennae yellow with yellowish setae; setae on scape longer and darker than those of pedicel and flagellum; scape thick, length-width ratio approximately 3:1.

Prothorax generally pale brown with yellowish setae but darker ventrally, pronotum pale brown, laterally with blackish brown spots. Meso- and metathorax pale brown, mesonotum with some blackish brown spots medially; metanotum immaculate. Legs pale yellow with pale brown setae; tibia and tarsus with dark brown spots, profemur with several pale brown spots; metafemur proximally with a dark brown spot. Forewing falcate on apex, slightly smoky brown but slightly darker along posterior margin, with brown spots on branching points of several longitudinal veins; pterostigma indistinct, brown. Longitudinal veins pale yellow, interrupted by many brownish spots; crossveins brown. Hindwing slightly paler than forewing, immaculate.

Abdomen generally yellow, tergum pale brown with some brown spots.

Male genitalia. Tergum 9 + ectoprocts with posterodorsal portion nearly right-angled, slightly elongated and tapering posteroventrad. Trichobothria reduced. Sternum 9 slightly shorter than sternum 8, slightly concaved posteriad. Hypomeres membranous, directed posteriorly and tapering distally. Gonocoxites 9 paired, with hooklike apex. Complex of fused gonocoxites, gonapophyses and gonostyli 10 (= paramere-mediuncus complex) with large spiral part composed of nearly 14 loops, anteriorly reaching to segment 7, posteriorly ending at segment 9. Fused gonocoxites 11 (= gonarcus) in lateral view nearly rod-shaped, in ventral view medially with a ring-shaped lobe. Torulus broadly arched. Hypandrium internum large.

Female. Unknown.

Materials examined. Holotype ♂, China: Guizhou, Mt. Yulongshan [27°73.054'N, 107°64.168'E], VIII.2017, Malaise trap, Mengqing Wang ( CAU) . Paratypes: 1♂, China: Guizhou, Mt. Yulongshan [27°73.054'N, 107°64.168'E], IX.2017, Malaise trap, Mengqing Wang ( CAU) ; 1♂, China: Guizhou, Tiancheng [27°78.845'N, 107°59.255'E], IX.2017, Malaise trap, Mengqing Wang ( CAU) .

Distribution. China (Guizhou).

Etymology. The species name refers to the shape of tergum 9 + ectoprocts (lat. acutus = acute, caudatus = tailed).

Remarks. This species appears to be closely related to I. dictyophilum from Zhejiang and Anhui in having generally similar male genitalia, but it can be distinguished from the latter species by the male tergum 9 + ectoprocts with posterodorsal portion nearly right-angled and with posteroventral portion elongated and tapering. In I. dictyophilum the male tergum 9 + ectoprocts is posteriorly convex.

Figures

FIGURE 11. Isoscelipteron acuticaudatum sp. nov., male, habitus photo. Scale bar: 5.0 mm.

FIGURES 33–34. Isoscelipteron acuticaudatum sp. nov. 33. Male genitalia, lateral view; 34. Male genitalia, ventral view. e: ectoproct; hi: hypandrium internum; hm: hypomere; gx9: gonocoxite 9; gx10: complex of fused gonocoxites, gonapophyses and gonostyli 10 (= paramere-mediuncus complex); gx11: gonocoxite 11 (= gonarcus); t: torulus; S7–9: sternum 7–9; T7–9: tergum 7–9. Scale bar: 0.5 mm.