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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-08-22 and was most recently seen on 2026-08-22.
Allenypterus is an extinct genus of coelacanths. Fossils have been discovered in Bear Gulch Limestone, Montana, USA, which dates to the Serpukhovian stage of the late Early Carboniferous (Mississippian). Its caudal fin morphology is highly unusual among coelacanths, with the caudal (tail) fin rays being short and extending far forwards along the body which is suggested to be an adaptation to very slow undulatory movement, similar to living notopterid and gymnotid fish and that it probably lived in weedy, sheltered environments. Its small teeth and small gape suggesting that it consumed small, slow moving soft bodied prey. It lived alongside other coelacanths, including Caridosuctor, Polyosteorhynchus, Lochmocercus, and Hadronector.
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