Named By: W. G. Melton - 1969.
Classification: Chordata, Sarcopterygii, Hadronectoridae.
Species: A. montanus (type).
Size: Roughly about 15 centimetres long.
Known locations: USA, Montana.
Time period: Pennsylvanian to Mississippian of the Carboniferous.
Fossil representation: Almost complete specimens.
Allenypterus is a genus of lobe finned fish that is known to have lived in the waters of what would become Montana during the Carboniferous. Allenypterus had a very deep body and reduced limbs, strongly suggesting that this fish was a slow swimmer and focused more towards manoeuvring in slow flowing or even still waters.
- A new dorypterid fish from central Montana. Northwest Science 43:196-206. - W. G. Melton - 1969.