Indosialis bannaensis, Liu, Xingyue, Yang, Ding & Hayashi, Fumio, 2006

Liu, Xingyue, Yang, Ding & Hayashi, Fumio, 2006, Discovery of Indosialis from China, with description of one new species (Megaloptera: Sialidae), Zootaxa 1300, pp. 31-35 : 33

Indosialis bannaensis sp. nov.

( Figs. 1–7 )

Diagnosis. Head and prothorax orange; male ninth sternite with posterior margin strongly produced; male tenth sternite with apical half divided into a pair of small, straight lobes with a hooked tip.

Description

Male. Body length 6.5 mm; forewing length 9.0 mm, hindwing length 7.5 mm.

Head orange with post­ocular region somewhat brownish; clypeal area and mouthparts pale yellow. Compound eyes black. Antenna black except for scape and pedicel pale yellow.

Thorax orange laterally with pair of brown spots on metanotum. Fore and middle legs yellow, with tibiae and tarsi black; hind legs brown with tibiae and tarsi black. Wings pale grayish brown; veins pale brown. Forewing about thrice as long as wide; costal region with extreme base slightly narrower with five distinct basal costal crossveins and five indistinct distal costal crossveins, three crossveins between R 1 and Rs, R 2 + 3 bifurcate with branches widely apart, R 4 + 5 bifurcate with branches closed to each other, M 1 + 2 and M 3 + 4 simple, Cu 1 bifurcate, Cu 2 simple, 1 A simple, 2 A bifurcate. Hindwing much broader than forewing, about twice as long as wide, costal region narrow throughout; venation similar to forewing, except for costal region with only two distinct basal crossveins and Rs basally with additional one crossvein connected to R 1.

Abdomen reddish brown. Ninth sternite broad, posteriorly directed, with posterior margin strongly produced. Tenth tergite short, in lateral view subtriangular with blunt tip, in dorsal view slightly incurved with inner margin connected by membrane. Male ninth gonostylus robust, distal half curved dorsad with tip slightly curved outward. Tenth sternite strongly sclerotized, obliquely directed dorsad, with base expanded into large flattened plate; its distal half elongate, longitudinally divided into pair of straightly produced spinous lobes, with tip curved ventrad.

Female unknown.

Type materials. Holotype ɗ, CHINA: Yunnan Province, Xishuangbanna National Reserve, Mengla, Shangyong, Longmen, 650 m, 2005. V. 17, X.Y. Liu ( CAU).

Distribution. China (Yunnan).

Etymology. The specific epithet ‘bannaensis’ refers to the type locality of the new species.

Remarks. The new species differs from I. minora by the male ninth sternite with the posterior margin strongly produced and the male tenth sternite with the distal half straightly produced. In I. minora , the posterior margin of the ninth sternite is feebly produced, and the distal half of the male tenth sternite has each lobe curved outward ( Nel et al. 2002). The venation of the new species differs from the fossil Indosialis species, I. beskonakensis , by the hindwing having four crossveins between R 1 and Rs and a bifurcate Cu 1, while in the hindwing of I. beskonakensis , there are five crossveins between R 1 and Rs, and the Cu 1 is simple.

Figures

FIGURES 1 – 7. Indosialis bannaensis sp. nov. 1. Head and prothorax, dorsal view. 2. Venations of forewing. 3. Venations of hindwing. 4. Male genitalia, dorsal view. 5. Male genitalia, ventral view. 6. Male genitalia, lateral view. 7. Male genitalia, caudal view. Scale lines: 0.5 mm (for figs. 1 – 3) and 1.0 mm (for figs. 4 – 7).