Abstract
The dobsonfly genus Protohermes is the largest genus in Megaloptera, with the richest species diversity and the widest geographic distributions. In the present study, the Protohermes costalis species-group is recognised, including 18 species. Eight species are described herein as new: Protohermes acutatus, Protohermes basimaculatus, Protohermes disjunctus, Protohermes lii, Protohermes orientalis, Protohermes stigmosus, Protohermes triangulatus and Protohermes yangi spp. nov. The interspecific phylogeny within the P. costalis species-group is reconstructed by a cladistic analysis. Discussions on the phylogeny and the biogeography of the P. costalis species-group are also made.
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