Indosialis Lestage, 1927

Piraonapicha, Kanyakorn, Sangpradub, Narumon, Jaitrong, Weeyawat & Liu, Xingyue, 2020, The alderfly genus Indosialis Lestage, 1927 (Megaloptera: Sialidae) in Thailand and Laos, with a description of a new species, Zootaxa 4786 (2), pp. 233-253 : 235

Genus Indosialis Lestage, 1927

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

Diagnosis. Revised from Liu et al. (2008). Adults: Body brown, while head and prothorax orange or pale brown; head with strongly prominent compound eyes; labrum suboval in both sexes, but slightly incised anteriorly in male; fore and hind wings suboval, forewing about thrice as long as wide with costal region feebly dilated; RP and MA bifurcate respectively; both MP1 and MP2 simple. Male: Tergum 9 large, in dorsal view short, subtrapezoidal, with anterior and posterior margins more or less incised; sternum 9 broad and produced posteriorly; gonocoxite 9 much longer than wide, more or less produced posteriad; ectoprocts short and separated into a pair of subtriangular lobes, which medially are connected by a membrane; fused gonocoxites 11 strongly sclerotized as a large, flattened plate; gonostyli 11 present as a pair of long spinous projections. Female: Sternum 7 broad and posteriorly produced; gonocoxites 8 strongly sclerotized composed of a pair of posteriorly directed lobes; gonapophysis 8 setose and broadly plate-like; ectoprocts feebly sclerotized, small, and suboval. Larvae: Head subrectangular; labrum subtriangular, with anterior margin convex (not strongly pointed anteriorly); antenna with four segments; inner margin of mandible with large and acute apical tooth, followed by medium-sized preapical tooth and a small basal tooth.

Distribution. China, India, Laos, Malaysia, Singapore, Thailand and Vietnam.