Abstract
An investigation of freshwater Ellerbeckia species in Japan was undertaken with three taxa, E. arenaria f. arenaria, E. arenaria f. teres and E. sp., reported herein. Recent E. arenaria f. arenaria was found at one site in Lake Yamanaka, recent E. arenaria f. teres was also found at one site in Lake Akan, fossil E. arenaria f. teres was found in Early Miocene to Pleistocene sediments from 12 localities and E. sp. was found in Early Miocene sediment. All three taxa are illustrated using LM and SEM images, with an additional stereomicroscope photograph for one taxon.
