Gli squali fossili
This genus is known from Europe, Africa and North America deposits, but only by isolated teeth and vertebral centra. Cappetta (1987) included as a western North Atlantic species, C. borodini (CAPPETTA & CASE 1975). Welton & Farish (1993) ascribe two others to the Cretaceous of Texas, C. crassidens (DIXON 1850) and C. semiplicatus (MUNSTER in AGASSIZ 1843).
The teeth have bilobate roots
with a U-shaped basal margin and lingual protuberance. Some teeth show
evidence of a very weak nutrient groove. The cusp is triangular & elongated
but never particularly broad. The cutting edge is complete, and in most
species the shoulders bear divergent triangular cusplets and the crown
bear folds (wrinkles). The teeth of C. borodini are small, have elongated
root lobes and bear strong wrinkles (folds) on the lingual and labial surface
of most teeth.
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