Ctenopetalus serratus
Ctenopetalus serratus is the name borne by certain isolated petalodont teeth from the Lower Carboniferous of the British Isles. These have not found in the Bear Gulch Limestone. These teeth differ from Petalodus in the lesser crown height/length ratio and by having stronger denticulations along the crown. Ctenopetalus serratus is the nominal Type Species of the genus Ctenopetalus Davis, 1881.
These specimens are from Armagh, Ireland. Two teeth are illustrated; the one on the left is a worn tooth in labial view. Another tooth is shown in labial (center) and lingual (right) views (after Davis, 1881).
Reference:
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Davis, J.W. 1881. "On the genera Ctenoptychius, Agassiz, Ctenopetalus, Agassiz, and Harpacodus, Agassiz." Annals and Magazine of Natural History (5) 8:424-427.
(The Agassiz reference in Davis is to an unpublished manuscript.)