Sialis jianfengensis Yang, Yang & Hu

Liu, Xingyue & Yang, Ding, 2006, Revision of the genus Sialis from Oriental China (Megaloptera: Sialidae), Zootaxa 1108, pp. 23-35 : 27-29

Sialis jianfengensis Yang, Yang & Hu ( Figs. 2 & 10 )

Sialis jianfengensis Yang, Yang & Hu, 2002: 275 .

Diagnosis. Head orange with frons and clypeus black; pronotum yellowish brown with anterior margin dark; wings narrow, 1/3 of length.

Female. Forewing length about 14–18 mm, hindwing length 13–16 mm.

Head orange, vertex somewhat brown, frons and clypeus black. Compound eyes brown. Antenna black. Mouthparts black.

Thorax black; pronotum yellowish brown with anterior margin blackish brown. Legs black. Wings narrow, 1/3 of length, grayish brown, forewings proximally darkened; veins dark brown.

Abdomen black. Seventh sternite with posterior margin slightly elevated. Eighth sternite broad, subquadrate, moderately sclerotized except for a narrow median area. Ninth abdominal segement separated with a pair of membranous plates.

Male. Unknown.

Material examined. Holotype Ψ, CHINA: Hainan, Jianfengling, 1982. II.22/26, H.Q. Chen & K.Z. Yun. Paratypes: 2 ΨΨ, same data as holotype.

Distribution. China (Hainan).

Remarks. This species distinctly differs from all the other Sialis species by the body coloration and the narrow wings. It seems to be related to some Protosialis species. In Protosialis species, the costal regions of the forewings are weakly dilated, and R2+3 is only bifurcated. The lack of the male makes it difficult to determine the exact generic and specific status of this species. However, it is herein considered to be a true Sialis species by the distinctly dilated costal regions of the forewings and the four branched R2+3.

Figures

FIGURES 10. Female genitalia of Sialis jianfengensis Yang, Yang & Hu, ventral view. Scale line: 0.5 mm.

FIGURES 1 – 3. Habitus photos of the Sialis species from Oriental China. 1. S. elegans sp. nov. (Paratype). 2. S. jianfengensis Yang, Yang & Hu (Holotype). 3. S. kunmingensis sp. nov. (Holotype).