Ctenacanthus

Ctenacanthus (from κτείς kteis, 'comb' and ἄκανθα akantha, 'spine') is an extinct genus of ctenacanthiform chondrichthyan. Remains have been found in the Bloyd Formation (Carboniferous Period) of Arkansas and the Cleveland Shale (Devonian Period) of Ohio in the United States and in South America.

Valid species

 * Ctenacanthus buttersi St. John & Worthen, 1883
 * Ctenacanthus chemungensis Claypole, 1885
 * Ctenacanthus concinnus Newberry, 1875
 * Ctenacanthus denticulatus McCoy, 1848
 * Ctenacanthus 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, 1889
 * Ctenacanthus tumidus Newberry, 1889
 * Ctenacanthus vetustus Eastman, 1902
 * Ctenacanthus wrightii Newberry, 1884
 * Ctenacanthus amblyxiphias Cope, 1891