Ctenacanthus
Ctenacanthus is an extinct genus of ctenacanthiform chondrichthyan. Remains have been found in the Bloyd Formation of Arkansas and the Cleveland Shale of Ohio in the United States and in South America.
Ctenacanthus buttersi St. John & Worthen, 1883Ctenacanthus chemungensis Claypole, 1885 Ctenacanthus concinnus Newberry, 1875Ctenacanthus denticulatus McCoy, 1848Ctenacanthus formosus Newberry, 1873 Ctenacanthus harrissi Caster, 1930 Ctenacanthus lamborni Wells, 1944 Ctenacanthus major Agassiz, 1843 Ctenacanthus pellensis St. John & Worthen, 1883 Ctenacanthus sculptus St. John & Worthen, 1875 Ctenacanthus terrelli Newberry, 1889Ctenacanthus tumidus Newberry, 1889Ctenacanthus vetustus Eastman, 1902Ctenacanthus wrightii Newberry, 1884Ctenacanthus amblyxiphias Cope, 1891
Palaeoecology
Dental microwear texture analysis of C. concinnus teeth shows that the species was an opportunistic feeder that would have eaten a variety of animals, including other chondrichthyans and ectocochleate cephalopods.