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Order Summary for Heterodontiformes
Main Ref.:	Nelson, J.S., 1994
Order:	Heterodontiformes    bullhead and horn sharks
Class:	Elasmobranchii (sharks and rays)
Sister Order:	Orectolobiformes     170 M years
Ref.:	Shirai, S., 1996
First fossil record:	middle Jurassic
Occurs in:	Marine      Freshwater      Brackish
Remarks:	Two dorsal fins, each with a spine; anal fin present; five gill slits; eyes without nictitating fold; spiracle present but small; nostrils connected with mouth by deep grove.
Class etymology:	Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335.
Order etymology:	Greek, heteros = other + Greek, odous = teeth + Latin, forma = shape. Ref. 45335.
Families:	1 Heterodontidae

Identification keys | Tree of Life

Ref.:   ( e.g. 9948)
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Page created by: Eli, 17.10.00, last modified by Eli, 15.02.05.