Description of a second south american species in the malagasy earwig genus mesodiplatys from a cave habitat, with notes on the definition of haplodiplatyidae (Insecta, dermaptera)

The genus Mesodiplatys (Dermaptera: Diplatyidae) comprises eight species from Madagascar and one species from Peru. Based on a sample collected from a cave in Brazil, a new species of this genus, Mesodiplatys falcifer Kamimura, sp. n., is described as the second species from South America. Based on a reexamina-tion of the holotype of Mesodiplatys insularis, a revised key to Mesodiplatys species is provided. The definitions of the genera Mesodiplatys and Haplodiplatys and the family Haplodiplatyidae are also reconsidered.