{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,9]],"date-time":"2026-05-09T12:15:57Z","timestamp":1778328957163,"version":"3.51.4"},"reference-count":26,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T00:00:00Z","timestamp":1759449600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T00:00:00Z","timestamp":1759449600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Sci Rep"],"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:p>Ishizaki\u2019s work is among the most significant taxonomic studies of recent Ostracods in Japan. However, limited access to scanning electron microscopes at that time led to several misidentifications, causing confusion in biogeographical interpretations, including the fossil record. In this study, we rephotographed Ishizaki\u2019s type specimens under an electron microscope and compared them with illustrations from papers published over the past 70\u00a0years since Ishizaki\u2019s work. This has enabled us to compile an updated synonym list and perform biogeographical assessments based on Titterton and Whatley\u2019s definitions. Of the 47 Ishizaki specimens examined, 24 species either have the oldest fossil record or are exclusively found around Japan in both fossil and modern records. Four species, originally recorded on the coast of South China, including Taiwan, are now only found around Japan: <jats:italic>Sinoleberis tosaensis, Aurila tosaensis, Loxoconcha zamia<\/jats:italic>, and <jats:italic>Loxoconcha viva<\/jats:italic>. Additionally, 15 species exhibit a wider biogeographical distribution, ranging from the South China Sea, the Indochina Peninsula, the Philippines, and Indonesia to around Japan.<\/jats:p>","DOI":"10.1038\/s41598-025-22250-5","type":"journal-article","created":{"date-parts":[[2025,10,3]],"date-time":"2025-10-03T13:45:16Z","timestamp":1759499116000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Revisiting recent Ostracod type material from Ishizaki with insights into species distribution and taxonomic reassessment"],"prefix":"10.1038","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2975-6675","authenticated-orcid":false,"given":"Gengo","family":"Tanaka","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7141-1072","authenticated-orcid":false,"given":"Sota","family":"Niiyama","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,10,3]]},"reference":[{"key":"22250_CR1","first-page":"1","volume":"40","author":"K Ishizaki","year":"1968","unstructured":"Ishizaki, K. Ostracodes from Uranouchi Bay, Kochi prefecture, Japan. Sci. Rep. Tohoku Univ. Sendai Second Ser. (Geol.) 40, 1\u201345 (1968).","journal-title":"Sci. Rep. Tohoku Univ. Sendai Second Ser. (Geol.)"},{"key":"22250_CR2","first-page":"197","volume":"41","author":"K Ishizaki","year":"1969","unstructured":"Ishizaki, K. Ostracodes from Shinjiko and Nakanoumi, Shimane prefecture, Western Honshu, Japan. Sci. Rep. Tohoku Univ., Sendai Second Ser. (Geol.) 41, 197\u2013224 (1969).","journal-title":"Sci. Rep. Tohoku Univ., Sendai Second Ser. (Geol.)"},{"key":"22250_CR3","first-page":"59","volume":"43","author":"K Ishizaki","year":"1971","unstructured":"Ishizaki, K. Ostracodes from Aomori Bay, Aomori prefecture, Northeast Honshu, Japan. Sci. Rep. Tohoku Univ., Sendai Second Ser. (Geol.) 43, 59\u201397 (1971).","journal-title":"Sci. Rep. Tohoku Univ., Sendai Second Ser. (Geol.)"},{"key":"22250_CR4","first-page":"759","volume-title":"Evolutionary biology of Ostracoda","author":"R Titterton","year":"1988","unstructured":"Titterton, R. & Whatley, R. C. The provincial distribution of shallow water Indo-Pacific marine Ostracoda: antiquity, dispersal routes and mechanisms. In Evolutionary biology of Ostracoda (eds Hanai, T. et al.) 759\u2013786 (Kodansha, 1988)."},{"key":"22250_CR5","first-page":"595","volume":"1","author":"C Bergmann","year":"1847","unstructured":"Bergmann, C. Ueber die Verh\u00e4ltnisse der W\u00e4rme\u00f6konomie der Thiere zu ihrer Gr\u00f6sse. G\u00f6ttinger Studien 1, 595\u2013708 (1847).","journal-title":"G\u00f6ttinger Studien"},{"key":"22250_CR6","first-page":"871","volume-title":"Evolutionary biology of Ostracoda","author":"TM Cronin","year":"1988","unstructured":"Cronin, T. M. Geographical isolation in marine species: Evolution and speciation in Ostracoda, I. 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Variation of Pistocythereis and Keijella species in Gamagyang Bay, south coast of Korea. In Evolutionary biology of Ostracoda (eds Hanai, T. et al.) 367\u2013373 (Kodansha, 1988)."},{"key":"22250_CR10","first-page":"319","volume-title":"Evolutionary biology of Ostracoda","author":"N Ikeya","year":"1988","unstructured":"Ikeya, N. & Ueda, H. Morphological variations of Cytheromorpha acupunctata (Brady) in continuous populations at Hamana-ko Bay, Japan. In Evolutionary biology of Ostracoda (eds Hanai, T. et al.) 319\u2013340 (Kodansha, UK, 1988)."},{"key":"22250_CR11","unstructured":"Kingma, J. T. Contributions to the knowledge of the Young-Caenozoic Ostracoda from the Malayan region. (Kemink, 1948)."},{"key":"22250_CR12","first-page":"37","volume":"51","author":"K Ishizaki","year":"1981","unstructured":"Ishizaki, K. Ostracoda from the East China Sea. Sci. Rep. Tohoku Univ. Second Ser. 51, 37\u201365 (1981).","journal-title":"Sci. Rep. Tohoku Univ. 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We declared that no animal ethical approval is required.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}}],"article-number":"34637"}}