Abstract
HimalcercyonHebauer, 2002stat. nov.is elevated to genus rank based on the unique form of its mesoventral elevation. The genus is reviewed, redescribed, and illustrated in detail. Two species are recognized:Himalcercyon mirus(Hebauer, 2002)comb. nov.from Nepal andH. franzisp. nov.from Chinese Himalaya (Xizang Autonomous Region). Both species are illustrated and diagnosed. An updated key to the Asian genera of the tribe Megasternini (Coleoptera, Hydrophilidae, Sphaeridiinae) is provided, along with the SEM micrographs of ventral morphology of these genera. New replacement nameOreosternumnom. nov.is proposed forOreocyonHebauer, 2002 which is preoccupied byOreocyonMarsh, 1872 (Mammalia, Oxyenidae) andOreocyonKrumbiegel, 1949 (Mammalia, Canidae).
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