{"title":"An Oldest Record of the Shark Cosmopolitodus planus (Lamnidae) from the Lower Miocene of the Sakhalin, Russia","authors":"T. P. Malyshkina, M. V. Nazarkin, A. V. Solovyow","doi":"10.1134/s0032945224010144","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An isolate tooth of a rare extinct hook-toothed mako <i>Cosmopolitodus planus</i> (Agassiz, 1856), discovered in the Lower Miocene deposits of the Chekhov Formation of Sakhalin Island is described. This extinct species was distributed exceptionally in the Pacific basin, and is known mainly from the deposits of the Middle and Upper Miocene. Thus, the described tooth is, probably, the oldest record of this species. The geographic and stratigraphic distribution of this species, as well as the validity of the genus <i>Cosmopolitodus</i> Glickman, 1964, are discussed.</p>","PeriodicalId":48537,"journal":{"name":"Journal of Ichthyology","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Ichthyology","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1134/s0032945224010144","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"FISHERIES","Score":null,"Total":0}
引用次数: 0
Abstract
An isolate tooth of a rare extinct hook-toothed mako Cosmopolitodus planus (Agassiz, 1856), discovered in the Lower Miocene deposits of the Chekhov Formation of Sakhalin Island is described. This extinct species was distributed exceptionally in the Pacific basin, and is known mainly from the deposits of the Middle and Upper Miocene. Thus, the described tooth is, probably, the oldest record of this species. The geographic and stratigraphic distribution of this species, as well as the validity of the genus Cosmopolitodus Glickman, 1964, are discussed.
期刊介绍：
Journal of Ichthyology is an international peer-reviewed journal published in collaboration with the Russian Academy of Sciences. It covers original studies in fish taxonomy, evolution, molecular biology, morphology, species diversity, zoological geography, genetics, physiology, ecology, behavior, reproduction, embryology, invasions, and protection. Some problems of applied ichthyology are also covered. The journal welcomes manuscripts from all countries in the English or Russian language.
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