Creating a preliminary checklist for recent freshwater Japanese endemic diatom taxa

Abstract

A checklist of recent freshwater Japanese endemic diatom taxa was compiled. 427 recent freshwater diatom taxa have been described from Japan. 122 taxa are reported only from Japan and should be endemic. 29 taxa were reported from both Japan and other East Asian countries. 204 taxa have never been used since their first description and are regarded as ‘Practically Non-existent Species (PNS)’ and omitted from the analysis.