TInfraclass Cladoselachimorpha

Cladodont-type tooth (tall central cusp and one or more pairs of lateral cusps on a broad base); claspers usually absent; no anal fin; paired fins in shape of triangular flaps; radials of fins unsegmented and extending almost to the edge of the fin.

Devonian to Pennsylvanian fossil groups, too poorly known to be properly classified but possibly belonging to the cladoselachimorphs (see Cappetta et al., 1993, for a provisional classification), including "Cladodus" (a series of unrelated species, placed in the family Cladodontidae), Coronodus, Symmoriidae (e.g., Cobelodus, Denaea, and Symmorium), Falcatidae (Damocles and Falcatus), and Stethacanthidae (e.g., Orestiacanthus and Stethacanthus) (e.g., Lund, 1990). Coates and Sequeira (2001) described new morphological features of Stethacanthus.

fOrder CLADOSELACHIFORMES. Two dorsal fins, at least a spine associated with the first. One family.

Family CLADOSELACHIDAE. Upper Devonian to Mississippian.

Cladoselachidae

Maximum length about 2 m. Includes the well-known Cladoselache.

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