Indosialis Lestage

Liu, Xingyue, Flint, Oliver S. & Yang, Ding, 2008, Revision of the alderfly genus Indosialis Lestage (Megaloptera: Sialidae), Zootaxa 1677, pp. 47-56 : 48

Genus Indosialis Lestage

Indosialis Lestage 1927: 118 . Type species: Protosialis minora Banks, 1920: 325 , by monotypy.

Diagnosis. Adults of Indosialis generally have brown body coloration with the head and prothorax orange or pale brown. The head is smooth without raised scars and has strongly prominent compound eyes. The labrum is suboval in both sexes, but slightly incised anteriorly in the male. Both wings are suboval, the forewing being about thrice as long as wide with the costal region feebly dilated. Both R2+3 and R4+5 are bifurcate, and M1+2 and M3+4 are simple. Male ninth terga are large, subtrapezoidal and short, with the anterior and posterior margins incised to varying depths, while the ninth sterna are broad and produced posteriorly to varying degrees. The male ninth gonostylus is much longer than wide and directed posteriad. The male tenth tergum consists of a pair of short, subtriangular processes, the inner portions of which are connected by a membrane. Male tenth sterna are strongly sclerotized, the proximal portions of which are expanded into large, flattened plates, and the distal half of which are produced as a pair of long spinous lobes bearing a few setae. The female seventh sternum is broad and posteriorly produced. The female eighth sterna are composed of a pair of strongly sclerotized, posteriorly directed lobes. Female ninth abdominal sterna possess a pair of lateral subuliform processes that terminate in a broad gonocoxite. The female tenth tergum is feebly sclerotized, small, and suboval.

Distribution. China; India; Malaysia; Singapore; Vietnam; Turkey (fossil).