Author: Smith, 1838
Diagnostic Features:
Body usually stout. Snout bluntly conical, rather short; nostrils lateral on snout, situated adjacent to head rim in ventral view; mouth broadly parabolic; teeth flat, tirangular, with broad, serrated, nearly straight cusps, and lateral cusplets only in juveniles below 2 m long (which may have at least some smooth-edged or partially smooth); intermediate teeth in upper jaw very large, over half height of upper anteriors. First dorsal origin usually over the pectoral inner margins; anal origin under or slightly posterior to second dorsal insertion; no secondary keels on base of caudal.
Remarks:
See White, Tucker and Marshall (1961), and the International Commission on Zoological Nomenclature (1965) for the nomenclatural history of this genus.