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Heterodontidae
BULLHEAD
Bullhead, Horn, or Port Jackson Sharks; Horn; Port jackson sharks; Bullhead sharks

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Heterodontus francisci
© Copyright Ross Robertson, 2006 · 12
Heterodontus francisci
Heterodontus francisci
© Copyright Ross Robertson, 2006 · 12
Heterodontus francisci

Heterodontus
© Copyright Roger Steene, 2006 · 0
Heterodontus
Heterodontus mexicanus
© Copyright Photographer/SFTEP, 2002 · 0
Heterodontus mexicanus

Heterodontus francisci
© Copyright Photographer/SFTEP, 2002 · 0
Heterodontus francisci
Heterodontus mexicanus
© Copyright Photographer/SFTEP, 2002 · 0
Heterodontus mexicanus

Heterodontus mexicanus
© Copyright Photographer/SFTEP, 2002 · 0
Heterodontus mexicanus
Heterodontus quoyi
© Copyright Photographer/SFTEP, 2002 · 0
Heterodontus quoyi

Heterodontus mexicanus
www.fao.org Copyright Michel Lamboeuf · 0
Heterodontus mexicanus
Heterodontus quoyi
© Copyright Roger Steene, 2006 · 0
Heterodontus quoyi

Heterodontidae
© Copyright Roger Steene, 2006 · 0
Heterodontidae
español

Overview
Main identification features
  • head high, conical
  • both dorsals: front spine
  • c: asymmetric
  • 5 gill slits (3 over pectoral)
FAMILY HETERODONTIDAE

HORN SHARKS

This family contains a single genus (Heterodontus) with eight species that occur circumglobally, except for Central Pacific. Three species occur in the tropical eastern Pacific. Hornsharks are small, easily recognizable sharks distinguished by a squarish head and a stout, sharp spine at the beginning of each dorsal fin. They have five gill slits, the last three over the pectoral base. The tail is asymmetric.

These sharks are slow moving animals, often seen resting on the bottom amongst rocks or weeds. Horn sharks are oviparous. They lay unusual, large, spiral-flanged egg cases, usually among rocky crevices. The young are generally over 14 cm long at hatching. Hornsharks' diets consist mainly of benthic invertebrates including sea urchins, crabs, shrimps, abalone and other gastropods, oysters, polychaetes, and occasional small fishes. These sharks are generally harmless, but will pursue and bite if provoked by a diver.


References
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Acknowledgements

I thank Ashley MacDonald and John Pickering, University of Georgia, for technical support in building this page.


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