New species P. longicornis and P. lui identified from Casearia membranacea, highlighting genetic features.
In this paper, we describe two new species of Philanthaxia Deyrolle, 1864, from Hainan, China, namely, P. longicornis Ni & Song, sp. nov., and P. lui Ni & Song, sp. nov., with the adult host plant Casearia membranacea Hance (Salicaceae). The characters of these new species are described with illustrations, comparisons are made with the most similar species, and the COI gene sequence of P. longicornis and its analysis are provided.
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