Author: Smith, 1913
Diagnostic Features:
Body rather slender. Head and snout not bell-shaped in dorsoventral view; preoral snout length subequal to about 2/3 of mouth width; anterior nasal flaps small, with rear edges well in front of mouth; internarial space 0.7 to 1.3 times in nostril width; inside of mouth and edges of gill bars with papillae. First dorsal origin varying from well anterior to slightly posterior to free rear tips of pectorals, base closer to pelvic bases than pectoral bases; anal origin slightly anterior, under or slightly posterior to seond dorsal origin; caudal fin very narrow, tapelike, and long, dorsal margin 25 to 30% of total length. No colour pattern, except vertical barring on caudal fin.
Remarks:
Treatment of this genus follows Compagno (1970, 1979). Members of this genus had been previously placed in four genera, Eridacnis (for E. radcliffei), Neotriakis (for E. sin ), Proscyllium (for P. alcocki, a synonym of E. radcliffei), and Triakis (for T. barbouri) by various writers.