A specimen of the unstalked Cretaceous crinoid Uintacrinus socialis Grinnell, 1876, has a theca with an anomalous appearance that may be attributed to either inaccurate regeneration or unusual ...
The proposition is presented that the large thecae of many Paleozoic crinoids housed gonads, unlike modern crinoids that have the gonads on the arms or pinnules. Early in their history, inadunate ...
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