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Cymatium (gastropod) : ウィキペディア英語版 | Cymatium (gastropod)
''Cymatium'' is a genus of small to large predatory sea snails, marine gastropod mollusks in the family Ranellidae, the tritons. 〔 WoRMS (2010). Cymatium Röding, 1798. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138426 on 2010-11-07 〕 This genus has numerous species, perhaps as many as 100, some of which have a worldwide distribution. The genus has been divided into at least 10 subgenera. Some authors have elevated those subgenera, giving them the full status of genera, but this is by no means universally accepted. ==Fossil records== This genus is known in the fossil records from the Eocene to the Quaternary (age range: from 55.8 to 0.012 million years ago).〔 ( Fossilworks )〕
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