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Topic: Heterodontiformes

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	Shark Glossary - The World of Sharks
		Anal fins are paired fins near the tail end of some fish.
		Some sharks have an anal fin, including the following orders: Carcharhiniformes, Lamniformes, Orectolobiformes, Heterodontiformes, and Hexanchiformes.
		Squatina, also known as monkfish, are flat-bodied, bottom-dwelling sharks with a blunt snout.
	www.worldofsharks.net /glossary.htm (182 words)

	Heterodontiformes -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-24)
		The Heterodontiformes are a small ((biology) taxonomic group containing one or more families) order of very basal (primitive) modern (Any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales) sharks (Neoselachii) known colloquially as the "bullhead" sharks.
		Heterodontiforms have 2 dorsal fins, with fin spines, as well as an anal fin.
		The Heterodontiforms appear in the fossil record in the Early Jurassic, well before any of the other Galeomorphii, a group which includes all modern sharks except the dogfish and its relatives.
	www.absoluteastronomy.com /encyclopedia/h/he/heterodontiformes.htm (258 words)

	Shark - Wikipedia, the free encyclopedia
		Pristiophoriformes: These are the sawsharks, with an elongated, toothed snout that they use for slashing the fishes that they subsequently eat.
		Heterodontiformes: They are commonly referred to as the bullhead or horn sharks.
		Orectolobiformes: They are commonly referred to as the carpet sharks, including zebra sharks, nurse sharks, wobbegongs and the largest of all fishes, the whale shark.
	en.wikipedia.org /wiki/Shark (3372 words)

	fi org FAO Species Identification and Data Programme (SIDP), publications - Catalogues (33) (Site not responding. Last check: 2007-10-24)
		This is the second volume of an extensively rewritten, revised, and updated version of the original FAO Catalogue of Sharks of the World.
		The present volume reviews all 15 families 25 genera and 57 species of living bullhead, mackerel and carpet sharks (orders Heterodontiformes, Lamniformes and Orectolobiformes), that is, the non-carcharhinoid galeomorph sharks, including certain well-established but currently undescribed species mainly from Australia.
		Bullhead, mackerel and carpet sharks (Heterodontiformes, Lamniformes andOrectolobiformes).
	www.fao.org /figis/servlet/static?xml=sidp.xml&dom=org&xp_lang=en&xp_nav=3,3&xp_banner=fi (4201 words)

	Identification (Site not responding. Last check: 2007-10-24)
		Hexanchiformes - single dorsal and anal fin, 6-7 pairs of gill slits and a spiracle, no nictitating membrane in eye.
		Heterodontiformes - spine before two dorsal fins and a single anal fin, 5 pairs of gill slits and a spiracle, no nictitating membrane in eye.
		Squaliformes - two dorsal fins, 5 pairs of gill slits, either dorsal spines OR an anal fin may be present - never both.
	www2.cedarcrest.edu /academic/bio/jcigliano/Shark_Conservation/ID.htm (825 words)

	[No title] (Site not responding. Last check: 2007-10-24)
		This is an extensively rewritten, revised and updated version of the original FAO Catalogue of Sharks of the World.
		The present volume reviews all 15 families, 25 genera and 57 species of living bullhead, mackerel and carpet sharks (orders Heterodontiformes, Lamniformes and Orectolobiformes - the non-carcharhinoid galeomorph sharks), including certain well-established but currently undescribed species mainly from Australia.
		Accounts for all orders, families and genera are given and all keys to taxa are fully illustrated.
	www.fao.org /icatalog/search/dett.asp?aries_id=102488 (130 words)

	Heterodontiformes: Bullhead Sharks
		Dorsal fin skeleton of a Horn Shark (Heterodontus francisci) showing the stout fin spine and reduced fin skeleton - compare this illustration with that of the Spiny Dogfish fin skeleton).
		Fin spines were common in many ancient sharks, and have independantly evolved in two lineages of modern sharks, the bullheads (order Heterodontiformes) and the dogfishes (order Squaliformes).
		Heterodontoids are nocturnally active predators; juveniles feed on buried worms, adults on small fishes, crustaceans, and molluscs.
	www.elasmo-research.org /education/shark_profiles/heterodontiformes.htm (1135 words)

	Encyclopedia: Electricity
		Bioelectromagnetism (sometimes equated with bioelectricity) refers to the static voltage of biological cells and to the electric currents that flow in living tissues, such as nerves and muscles, as a result of action potentials.
		Orders Hexanchiformes Squaliformes Pristiophoriformes Squatiniformes Heterodontiformes Orectolobiformes Carcharhiniformes Lamniformes Sharks are a group (superorder Selachimorpha) of fish, with a full cartilaginous skeleton, a streamlined body plan, with normally 5, but up to 7 (depending on species) gill slits along the side of, or beginning slightly behind, the head (in some...
		Families Apteronotidae (ghost knifefishes) Eigenmanniidae (obsolete?) Gymnotidae (naked-back knifefishes and electric eels) Hypopomidae Rhamphichthyidae Sternopygidae The gymnotiforms are an order (Gymnotiformes) of knifefishes that have organs adapted to the exploitation of bioelectricity.
	www.nationmaster.com /encyclopedia/Electricity (5855 words)

	Palaeos Vertebrates: References M-Z
		Carcharhiniformes; Dallia, Esociformes, Esox, Galeomorphii; Heterodontiformes; Lamniformes; Neoselachii; Novumbra, Orectolobiformes, Umbra.
		Batomorphii, Carcharhiniformes, Galeomorphii, Heterodontiformes, Hypnosqualea, Lamniformes, Neoselachii, Neoselachii Overview, Orectolobiformes, Squalea, Synechodontiformes.
		Shishkin, MA, IV Novikov and YM Gubin (2000), Permian and Triassic temnospondyls from Russia in MJ Benton, MA Shishkin, DM Unwin and EN Kurochkin (eds.), The Age of Dinosaurs in Russia and Mongolia, Cambridge Univ. Press, pp.
	www.palaeos.com /Vertebrates/Lists/References/RefsMZ.html (6400 words)

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