Order HETERODONTIFORMES
Introduction
The order Heterodontiformes contains a single family of sharks distinctive in having a spine at the beginning of each of the two dorsal fins (Compagno 2001).
General References
Compagno, L.J.V. 2001. Sharks of the World. An annotated and illustrated catalogue of shark species known to date. Bullhead, mackerel and carpet sharks (Heterodontiformes, Lamniformes and Orectolobiformes). Rome : FAO, FAO Species Catalogue for Fisheries Purposes No. 1 Vol. 2 269 pp.