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Topic: Chondrichthyes

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	Introduction to the Chondrichthyes
		Sharks, skates, rays, and even stranger fish make up the Chondrichthyes, or "cartilaginous fish." First appearing on Earth almost 450 million years ago, cartilaginous fish today include both fearsome predators and harmless mollusc-eaters (harmless, that is, unless you are a mollusc).
		Members of the Chondrichthyes all lack true bone and have a skeleton made of cartilage (the flexible material you can feel in your nose and ears).
		Only their teeth, and sometimes their vertebrae, are calcified; this calcified cartilage has a different structure from that of true bone.
	www.ucmp.berkeley.edu /vertebrates/basalfish/chondrintro.html (220 words)

	Palaeos Vertebrates 70.100 Chondrichthyes: Eugnathostomata
		Phylogeny: Eugnathostomata : Teleostomi + * : Squatinactida + Orodontida + (Eugeneodontida + Petalodontiformes) + Chondrichthyes (Crown).
		Phylogeny: Chondrichthyes : Orodontida + (Eugeneodontida + Petalodontiformes) + Chondrichthyes (Crown) + *.
		Phylogeny: Chondrichthyes : Squatinactida + (Eugeneodontida + Petalodontiformes) + Chondrichthyes (Crown) + *.
	www.palaeos.com /Vertebrates/Units/070Chondrichthyes/070.100.html (914 words)

	Devonian Times - More about Chondrichthyes
		Sharks, skates, rays and holocephalans belong to a group of fishes called the Chondrichthyes (=cartilaginous fishes).
		U.C. Museum of Paleontology's introduction to the Chondrichthyes:
		Zangerl, R. "Chondrichthys I. Paleozoic elasmobranchs." in: H.P. Schultze (ed.) Handbook of Paleoichthyology, Vol.
	www.devoniantimes.org /who/pages/sharks.html (943 words)

	Chondrichthyes Summary
		The class Chondrichthyes consists of the cartilaginous fishes, including sharks, batoids (rays, skates, guitarfish, and sawfishes), and chimaeras, or ratfishes.
		The earliest evidence of Chondrichthyes in the fossil record is from the Devonian, the so-called Age of Fishes, from 350 to 400 million years ago.
		The Chondrichthyes or cartilaginous fishes are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage.
	www.bookrags.com /Chondrichthyes (2614 words)

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