Description
Original diagnose after Ebersole et al. (2019) p. 68 [27789]: This species can be differentiated from most other Claiborne Group chondrichthyans by the presence of compound and/or double serrations, which are absent on all taxa except Galeocerdo clarkensis White, 1956 and Otodus (Carcharocles) sp. Further separated from the carcharhiniforms Abdounia Cappetta, 1980, Galeorhinus, Hemipristis, Negaprion, Pachygaleus, and Physogaleus by the presence of fine mesial and distal serrations that extend to the apex of the main cusp. Differentiated from Galeocerdo clarkensis by the presence of erect and triangular upper anterior teeth, lower lateral teeth with a narrower and more erect crown, uniformly concave distal cutting edge with compound serrations medially, and lateral teeth have a more pronounced and ‘pinched’ lingual root protuberance. This species is separated from the following Paleogene Carcharhinus sensu stricto Underwood & Gunter (2012) species: the lower Lutetian Carcharhinus marçaisi from northern Africa (Arambourg 1952) by having serrated cutting edges; the middle Eocene Carcharhinus sp. from Jamaica (Underwood & Gunter 2012), the middle-to-late Eocene Carcharhinus sp. from Egypt (Underwood et al. 2011), and the middle-to-late Eocene Carcharhinus underwoodi and Carcharhinus sp. from Madagascar (Samonds et al. 2019) by having compound and/or double serrations and a more ‘pinched’ and pronounced lingual root boss; the Priabonian Carcharhinus balochensis from Pakistan Adnet et al. 2007 by having a less concave distal cutting edge, shorter and mesiodistally thinner crown in all anterior and lateral tooth positions, and pointed (as opposed to rounded) serrations on the lower two-thirds of the crown; and the Chattian Carcharhinus perseus Adnet et al., 2007 by having compound serrations and mesiodistally narrower crown in all tooth positions.

Remarks
shark-references Species-ID=15513;
valid after Ebersole et al. (2019) p. 67 [27789];

References