A New Species of the Bristletail Genus Pedetontus Silv. (Thysanura, Machilidae) from Thailand

摘要

A new bristletail species, Pedetontus phuketi sp. n., is described from Phuket Island, Thailand. It is most similar to P. hainanensis Yu, Zhang W.-W. et Zhang J.-Y., 2010 described from Hainan Island (China). The genus Pedetontus comprises 33 described species in two subgenera: Pedetontus s. str. (6 species) and Verhoeffilis (27 species). The subgenus Verhoeffilis has originated in the southeastern part of the Palaearctic Region. Its representatives migrated to North America in the Paleocene throughthe Bering Land Bridge which was sunken in the Eocene, so that the Nearctic centre of Pedetontus speciation became isolated and the subgenus Pedetontus s. str. has been formed. The Bering Land Bridge was formed at the end of the Miocene, and the backwardmigration of bristletails of the subgenus Pedetontus s. str. from the Nearctic to the Palaearctic occurred. Pedetontus palaearcti-cus was formed on Kamchatka. The southward migration of bristletails of the subgenus Verhoeffilis has led to formation of 10 Indo-Malayan species.