The following species are known: •
C. latissimus Agassiz, 1837 (
type species) - Late Triassic (
Rhaetian) of England (
Westbury Formation) •
C. eruciferus Cope, 1876 (
nomen dubium) •
C. robustus Knight, 1898 - Late Jurassic (
Kimmeridgian/
Tithonian) of Wyoming, US (
Morrison Formation) •
C. africanus Haug, 1905 •
C. avus W. H. Ferguson 1906 - Early Cretaceous (
Aptian) of Victoria, Australia (
Wonthaggi Formation) •
C. humei Priem, 1914 - Late Cretaceous (
Campanian) of Egypt (
Mut Formation) •
C. elegans Vollrath, 1923 •
C. frazieri Ostrom, 1970 - Early Cretaceous (
Aptian/
Albian) of Wyoming & Montana, US (Cloverly Formation), potentially
Campanian of New Jersey, US (
Mount Laurel Formation) •
C. gustasoni Kirkland, 1987 - Late Cretaceous (
Cenomanian) of Utah, US (
Naturita Formation) •
C. fossanovum Kirkland, 1998 •
C. stewarti Milner & Kirkland, 2006 - Early Jurassic (
Hettangian to
Sinemurian) of Utah, US (
Moenave and
Kayenta Formations) •
C. texanus Parris
et al., 2011 - Aptian/Albian of Texas, US (
Antlers and
Twin Mountains Formations) •
C. carteri Main
et al., 2014 - Cenomanian of Texas, US (
Woodbine Formation) •
C. kranzi Frederickson
et al., 2016 - Albian of Maryland, US (
Arundel Formation) •
C. kirklandi Frederickson & Cifelli, 2016 - Early Cretaceous (
Valanginian) of Utah, US (
Cedar Mountain Formation) •
C. shishkini Minikh, 2023 - Middle/Late Triassic (
Ladinian/
Carnian) of
Orenburg, Russia ==Palaeoecology==