Sialis versicoloris, Liu, Xingyue & Yang, Ding, 2006

Liu, Xingyue & Yang, Ding, 2006, Revision of the genus Sialis from Oriental China (Megaloptera: Sialidae), Zootaxa 1108, pp. 23-35 : 32-34

Sialis versicoloris sp. nov. ( Figs. 5, 6 , & 17–20)

Diagnosis. Head mostly black in male but entirely orange in female; prothorax orange; ninth sternite broad and directed obliquely ventrad; terminal plate feebly sclerotized, extremely short; genital plate with median portion quadrately expanded; lateral plate, in lateral view with dorsoposterior corner produced.

Male. Forewing length about 11 mm, hindwing length about 9 mm.

Head black with postocular margins slightly tinged with orange; antenna and compound eyes blackish brown.

Prothorax orange, meso and metathorax black. Legs dark.. Wings pale grayish brown with forewings much darker in proximal half; veins dark.

Abdomen dark. Ninth sternite broad, directed obliquely ventrad, in caudal view subtriangular with round tip. Terminal plate feebly sclerotized, extremely small, in lateral view subquadrate. Genital plate strongly sclerotized; proximal portion in lateral view distinctly inflated, in caudal view divided medially, forming a pair of acutely pointed lobes; median portion quadrately expanded; distal half distinctly curved caudally with tip hook­like and divided into a pair of processes. Lateral plate broad in lateral view, much wider than long, dorsoposterior slightly produced.

Female. Forewing length 7.0–8.6 mm, hindwing length 13 mm.

Head and prothorax entirely orange, with compound eyes, mouthparts, and antenna black.

Seventh sternite truncate posteriorly. Eighth sternite subquadrate, moderately sclerotized except for an anterior, subtriangular, medial area; anterolateral corners distinctly produced; posterior margin with median U–shaped notch. Membranous plate of ninth abdominal segment with medial portion distinctly narrowed, and with lateral portions suboval.

Type materials. Holotype ɗ, CHINA: Zhejiang, Fuyang, Wanshi, 1984. IV.10, B. H. Zhang ( ZJU). Paratype: 1 Ψ, same data as holotype ( ZJU).

Distribution. China (Zhejiang).

Etymology. The specific epithet “ versicoloris ” refers to the different color patterns of the head between the male and the female.

Remarks. See the remarks on S. elegans sp. nov.

Figures

FIGURES 4 – 6. Habitus photos of the Sialis species from Oriental China. 4. S. sinensis Banks. 5. S. versicoloris sp. nov. (Holotype). 6. S. versicoloris sp. nov. (Paratype).