SHARKS

Hexanchiformes: Hexanchidae 375
Key to the species of Hexanchidae occurring in the area
1a. Seven gill slits (Fig. 1). . . Heptranchias perlo
1b. Six gill slits . . . . . . . (Hexanchus) 2
7 gill slits
2a. Lower jaw with 6 rows of large comb-like teeth on each side; dorsal-fin base separated
from upper caudal-fin origin by a distance about equal to or slightly greater than its length;
size very large, up to 4.8 m (Fig. 2) . . . . . . . . . . . . . . . . . . . . . Hexanchus griseus
2b. Lower jaw with 5 rows of large comb-like teeth on each side; dorsal-fin base separated
from upper caudal-fin origin by a distance much greater that its length; size smaller, up to
1.8 m (Fig. 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hexanchus nakamurai
Fig. 2 Hexanchus griseus Fig. 3 Hexanchus nakamurai
List of species occurring in the area
The symbol is given when species accounts are included.
Heptranchias perlo (Bonnaterre, 1788).
Hexanchus griseus (Bonnaterre, 1788).
Hexanchus nakamurai Teng, 1962.
Fig. 1 Heptranchias perlo
References
Bigelow, H.B. and W.C. Schroeder. 1948. Sharks. In Fishes of the Western North Atlantic. Mem. Sears Found. Mar. Res.
(1)1:56-576.
Compagno, L.J.V. 1978. Hexanchidae. In FAO species identification sheets for fisheries purposes. Western Central
Atlantic (Fishing Area 31), Volume V, edited by W. Fischer. Rome, FAO (unpaginated).
Compagno, L.J.V.1984.FAO Species Catalogue.Vol.4.Sharks of the World.An annotated and illustrated catalogue of shark
species known to date. FAO Fish. Synop.,(125)Vol.4Pt.1:250 p.
Ebert, D.A. 1990.The taxonomy, biogeography and biology of cow and frilled sharks (Chondrichthyes: Hexanchiformes).
Unpub. Ph.D. thesis, Grahamstown, Rhodes University, 308 p.
McEachran, J.D. and J.D.Fechhelm.1998.Fishes of the Gulf of Mexico, vol. 1, Myxiniformes to Gasterosteiformes.Austin,
Texas, University of Texas Press, 1112 p.
Springer, S.and R.A.Waller.1969.Hexanchus vitulus, a new sixgill shark from the Bahamas.Bull. Mar. Sci., 19(1):159-174.