• Animal Systematics, Evolution and Diversity
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• v.22 no.2
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• pp.145-147
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• 2006

A new species of Baetidae (Ephemeroptera), Procloeon spinosum Nguyen and Bae, is described from Vietnam. The larva of P. spinosum can be distinguished from that of its congeners by the combination of the characters of the 7th gills, which bear spines on the posterobasal margin, and the terminal segment of maxillary palp, which is approximately 1/3 times length of the 2nd segment. The larvae inhabit pools or slow current margins of mountain streams in Northern Vietnam.