Abstract
Darthus vadorus n. gen. n. sp. is described from larvae and eggs from Borneo, Indonesia. Larvae are differentiated from those of all other genera of Heptageniidae by the combination of the absence of lamellae on gills 1, sickle shaped lamellae on gills 2–6, a median ridge terminated with a sharp spine on abdominal terga 2–9, a slightly thickened anterior margin of the head capsule, two rows of long, fine setae on the mid and hindtibiae, and scattered simple setae on the ventral surface of galealaciniae. Darthus is included in the tribe Afronurini Webb & McCafferty n. trib. with Afronurus Lestage and Parafronurus Zhou & Braasch. Atopopini Wang & McCafferty is restricted to the genera Atopopus Eaton, Thalerosphyrus Eaton, and Asionurus Braasch & Soldán.References
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