The presumed hagfish Myxineidus gononorum from the Upper Carboniferous of Montceau-les-Mines (Sa么ne-et-Loire, France): New data obtained by means of Propagation Phase Contrast X-ray Synchrotron Microtomography

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• 作者：Damien Germain^a ; Sophie Sanchez^b ; ^c ; Philippe Janvier^a ; ^{janvier@mnhn.fr" class="auth_mail} ; Paul Tafforeau^c
• 关键词：Vertebrata ; Cyclostomi ; Myxiniformes ; Petromyzontiformes ; Carboniferous ; Montceau-les-Mines ; Palaeoenvironment
• 刊名：Annales de Paleontologie
• 出版年：April-June 2014
• 年：2014
• 卷：100
• 期：2
• 页码：131-135
• 全文大小：1626 K

文摘

The re-examination of the presumed hagfish Myxineidus gononorum from the Carboniferous of Montceau-les-Mines by means of propagation phase contrast X-ray synchrotron microtomography confirms the presence of two series of non-mineralized denticles arranged in chevrons in the oral region. It also indicates the presence of possible traces of post-mortem mineralized soft tissues. A peculiar zone of less X ray-absorbing matter around the animal suggests the presence of an enlarged, lamprey-like oral disc. Re-interpreting Myxineidus as a lamprey would be in better agreement with the reputedly fresh-water environment of the Montceau-les-Mines Lagerstätte.