Evolutionary and taphonomic implications of a new species of Amphoracrinus from the early Viséan of Kentucky

William Ausich, Steven Koenig, Alan Goldstein & Gretel Monreal
The youngest species of Amphoracrinus, A. tenax n. sp., is described from the Muldraugh Member of the Borden Formation (early Viséan) of north-central Kentucky. With this new occurrence, both the oldest and youngest named species of Amphoracrinus are from North America. Numerous Tournaisian and Viséan crinoid faunas are documented in the United States, but only four are known to contain Amphoracrinus. Morphological analysis indicates that A. tenax is more closely aligned with species from China...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
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