Abstract
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.
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