DATE2026.08.07 #Press Releases

The True Identity of Pisidium habei, Long Considered a Rare Endemic Species of Yakushima Island, Has Been Uncovered

Disclaimer: machine translated by DeepL which may contain errors.

—A Taxonomic Revision Based on Morphology and DNA Analysis—

Summary

Naoto Sawada, Project Researcher at the School of Science, The University of Tokyo; Sukenobu Konishi and Aya Ueno of Yakushima Town; Assistant Professor Shun Ito of Shizuoka University; graduate student Yasuto Ishii of The Graduate University for Advanced Studies; Takumi Saito, Researcher at Masarik University;and Assistant Professor Osamu Kagawa of Tokai University, have revealed that Pisidium habei, previously believed to be endemic to Yakushima Island, is in fact the same species as Euglesa casertana, which is widely distributed throughout the world. By integrating morphological and DNA analyses, this study elucidated the true identity of this species, which had remained unclear for many years.
These research findings were published in the international journal on biology *Biologia* on July 31.

HabeMameshijimi

Journal

Journal Title	Biologia
Paper Title	Morphology and Habitat of Euglesa casertana Populations on Yakushima Island, Japan, with Implications for Its Taxonomic Status (Mollusca: Sphaeriidae)
Authors	Naoto Sawada, Sukenobu Konishi, Aya Ueno, Shun Ito, Yasuto Ishii, Takumi Saito, Osamu Kagawa
DOI	10.1007/s11756-026-02272-8