Isoscelipteron dictyophilum Yang & Liu, 1995

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 : 246-248

Isoscelipteron dictyophilum Yang & Liu, 1995

( Figs. 8 , 27–28 )

Isoscelipteron dictyophilum Yang & Liu, 1995: 280 . Type locality: China (Zhejiang: Mt. Gutian ).

Diagnosis. This species is characterized by the male tergum 9 + ectoprocts in lateral view posteriorly arcuately convex, the fused gonocoxites 11 (= gonarcus) medially with a ring-shaped lobe, the torulus slightly 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 dark brown on frons and clypeus. Compound eyes blackish brown. Antennae yellow with yellowish setae; setae on scape longer and darker than those on pedicel and flagellum; scape thick, length-width ratio approximately 3:1.

Prothorax generally pale brown with setae yellowish dorsally, but darker ventrally; pronotum pale brown, laterally with blackish brown spots. Meso- and metanotum 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 one dark brown spot. Forewing falcate on apex, slightly smoky brown, slightly darker along posterior margin, with brown spots on branching points of several longitudinal veins; pterostigma indistinct, brown, but some individuals with some reddish brown spots. 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 slightly longer than tergum 8, in lateral view posteriorly arcuately convex. Trichobothria reduced. Sternum 9 slightly shorter than sternum 8, slightly concaved posteriad. Hypomeres membranous, sack-shaped, directed posteriorly and tapering distally. Gonocoxites 9 paired, with hook-like 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 with a ring-shaped sclerite medially. Torulus arched. Hypandrium internum large.

Female genitalia (description after Yang & Liu 1995). Tergum 9 + ectoprocts ventrally slightly tapering and bearing long setae. Gonocoxites 9 paired, club-shaped; hypocaudae almost twice as long as basal part of gonocoxites 9 in lateral view. Bursa-copulatrix-spermatheca complex comprising a small but strongly sclerotized globular element and a basal coil with varying lumen in width.

Materials examined. 1♂, China: Zhejiang, Mt. Tianmushan [30°31.635'N, 119°44.619'E], 14.IX.2012 ( CAU) ; 1♂, China: Anhui, Mt. Huangshan, Yungu Temple [30°11.966'N, 118°19.285'E], 890 m, 22.VII.1977, Chikun Yang ( CAU) ; 3♂, China: Zhejiang, 21.VII.1995, Malaise trap, Chikun Yang ( CAU) ; 11♂, China: Zhejiang, 2.IX.1995, Malaise trap, Chikun Yang ( CAU) .

Distribution. China (Zhejiang, Anhui).

Remarks. The primary types of this species cannot currently be found. The types were collected from Mt. Gutianshan, Zhejiang, on August 2, 1992. The specimens herein examined were collected from adjacent areas near the type locality of I. dictyophilum and show identical morphological characters to that in type specimens (see Yang & Liu 1995), which thereby confirmed our identification of this species as I. dictyophilum .

Yang & Liu (1995) noted that this species is usually attracted by the Malaise trap but the females are rarely collected. All specimens we examined were males and no female specimens were available for our study.

Figures

FIGURE 8. Isoscelipteron dictyophilum Yang & Liu, male, habitus photo. Scale bar: 5.0 mm.

FIGURES 27–28. Isoscelipteron dictyophilum Yang & Liu. 27. Male genitalia, lateral view; 28. 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.