Sisyra stenoloma, Yang & Zheng & Liu, 2024

Yang, Ying, Zheng, Yuchen & Liu, Xingyue, 2024, New species of spongillafly genus Sisyra Burmeister, 1839 (Neuroptera: Sisyridae) from China and Laos, Zoological Systematics 49 (2), pp. 129-142 : 136-139

Sisyra stenoloma sp. nov. ( Figs 6–7 )

Diagnosis. Scape, pedicel and basal two flagellomeres pale brown, following 24 flagellomeres dark brown, then remaining distal ones pale. Forewing costal space weakly broadened basally. Male sternum 9 well developed, strongly protruded postroventrally, shorter than gonocoxites 9, nearly four times as long as wide in lateral view, distally narrowed. Gonocoxites 9 long and protruded postroventrally; distal half narrowed, and twisted inward; inner margin medially with three conical tubercles, and each with a long stiff bristle.

Description. Male. Body length 2.4 mm; forewing length 3.3 mm and width 1.2 mm; hindwing length 2.9 mm and width 1.1 mm.

Body yellowish brown, but probably due to poor preservation. Head without distinct marking, covered with many long setae; compound eyes prominent. Scape pale brown, swollen medially, nearly twice as long as wide, covered with long, stout setae; pedicel pale brown, slightly longer than flagellum; flagellum with 33 segments, basal two flagellomeres pale brown, same color as scape and pedicel, following 24 flagellomeres dark brown, then remaining distal ones pale; each segment covered with many setae; apical flagellomere slightly narrow distally. Maxillary and labial palpi brown; distal segment of maxillary palpus triangular in lateral view.

Thorax covered with many long setae. Legs slender; tarsomere 1 as long as total length of tarsomeres 2–4; pretarsal claws simple.

Wings hyaline. Forewing ovoid, slightly curved along costal margin, distally rounded, costal space weakly broadened basally; trichosors present along distal margin; pterostigma indistinct, brownish, with crossveins; costal space with nine crossveins proximad pterostigma; two scp–ra corssveins present basally and distally; RA with three pectinate and simple branches distally; RP with three main branches; three ra–rp crossveins; MA dichotomously branched distally; one rp–ma crossvein present; MP branched into MP1 and MP2, both branches bifurcated; one ma–mp crossvein present; CuA with five pectinate and simple branches; three mp–cua crossveins; CuP, A1 and A3 simple; A2 distally bifurcated; one cua–cup, one cup–a1, one a1–a2 present. Hindwing ovoid, distally rounded; trichosors present along distal margin; pterostigma indistinct, brownish, with crossveins; costal space with six crossveins proximad pterostigma; two scp–ra corssveins present basally and distally; RP with three main branches; one ra–rp crossvein; MA dichotomously branched distally; MP branched into MP1 and MP2, both branches bifurcated; one ma–mp crossvein present, interrupted centrally by a rounded hyaline spot; CuA with six pectinate and simple branches; one mp–cua crossvein; CuP, A1 and A2 simple; one cua–cup, one cup–a1, one a1–a2 present.

Abdomen brown; pregenital segment with small tergum and larger sternum, covered with many long setae. Tergum 9 reduced. Sternum 9 well developed, strongly protruded postroventrally, shorter than gonocoxites 9, nearly four times as long as wide in lateral view, distally narrowed, covered with long setae. Gonocoxites 9 long and strongly protruded posteroventrad; broad basally; distal half narrowed, and twisted inward; inner margin medially with three conical tubercles, and each with a long stiff bristle. Gonocoxites 11 arched and slender, without any projection; gonostyli 11 paired, subtriangular in dorsal view, medially concaved in caudal view. Ectoprocts covered with many long setae, lateroventrally rounded; callus cerci with four trichobothria. Hypandrium internum not found.

Female. Unknown.

Type material. Holotype ♂, China: Guangxi, Chongzuo, Longzhou, Nonggang , 22°28′N, 106°57′E, 20 May 1984, Fasheng Li leg. ( CAU).

Distribution. China (Guangxi).

Etymology. The specific epithet “ stenoloma ” refers to the strongly narrowed costal space of the forewing in the new species.

Remarks. This new species has similar narrowed forewing costal space with S. yunana , but these two species can be distinguished by the antennal marking patterns and the male gonocoxites 9. In S. stenoloma sp. nov., the scape, pedicel and basal two flagellomeres are paler than the following 24 flagellomeres, and the male gonocoxites 9 have three conical tubercles on its inner margin medially. However, in S. yunana , the basal antennomeres are in same color, and the male gonocoxites 9 bear a rounded tubercle at middle.

Figures

Figure 6. Sisyra stenoloma sp. nov., holotype, male, China (Guangxi). A. Habitus, lateral view. B–C. Head, ventral view (left) and dorsal view (right). D–E. Fore- and hindwing. Scale bars=1.0mm.

Figure 7. Sisyra stenoloma sp. nov., holotype, male genitalia. A–B. lateral view. C–D. dorsal view; E–F. caudal view. Scale bars = 0.1 mm.