A new family Kazimierzidae for the genus Kazimierzus, earlier recorded to the composite Microchaetidae (Annelida, Oligochaeta)

A review of the genus Kazimierzus Plisko, 2006, based on available type material enriched by study of selected specimens from the earthworm collection gathered at the NMSA and literature, revealed that the species presently accredited to this genus are characterized by unique features and clearly differ from the species of the other genera endorsed to Microchaetidae. Basing on this discovery the genus Kazimierzus is separated from Microchaetidae and Kazimierzidae fam. n. is erected to accommodate the whole 21 species of this genus. Species accredited to the new family Kazimierzidae are listed, their peculiar characters and specific distribution discussed.