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Topic: Actinopterygii

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	Re: When did the Sarcopterygii separate from Actinopterygii?
		It is true that tetrapods (amphibians, reptiles, mammals, birds) descended from members of the Sarcopterygii, but accepted classification schemes do not put these highly derived descendants in with the fleshy-finned fish.
		The oldest known fish are Cambrian, but these are primitive forms not assigned to either Sarcopterygii or Actinopterygii.
		According to Romer (1966), the split probably occurred in the early Silurian or late Ordovician, though the oldest known fossils of these two groups are early Devonian.
	www.madsci.org /posts/archives/feb2001/982264608.Ev.r.html (294 words)

	McGraw-Hill AccessScience: Actinopterygii (Site not responding. Last check: )
		Actinopterygii include about 24,000 described living species and many yet undescribed species.
		While most species are herbivores (plant eaters) or piscivores (fish eaters), some are parasitic (Trichomycteridae), some are ram-filter feeders (Polyodon), and some live within the internal organs of other organisms (pearlfishes) in possibly symbiotic, parastic, or mutualistic relations.
		Actinopterygii are extremely diverse morphologically, and include the smallest known adult vertebrates (for example, the Indian gobie, Trimmatom, with mature females reaching only 8-10 mm or 0.3-0.4 in.
	www.accessscience.com /Encyclopedia/0/00/Est_009100_frameset.html?doi (368 words)

	Highbeam Encyclopedia - Search Results for Dorsal
		Chauliodontidae (viperfish; subclass Actinopterygii, order Salmoniformes) A small family of deep-sea fish that have an elongated body, tapering down toward the tail, and a small dorsal fin that is not larger than the adipose fin but has a very long first dorsal ray that can be used as a lure.
		Nototheniidae (cod icefish; subclass Actinopterygii, order Perciformes) A small family of marine fish, most species of which have an elongate body, a large head, a short first dorsal fin ; the second dorsal and anal fins are long.
		Plesiopidae (roundhead, devilfish; subclass Actinopterygii, order Perciformes) A small family of marine fish that have a fairly deep body, a large head with a large mouth, a single, continuous, dorsal fin, and a rounded tail fin.
	www.encyclopedia.com /SearchResults.aspx?Q=Dorsal&StartAt=41 (1044 words)

	Highbeam Encyclopedia - Search Results for brackish
		Gasterosteidae (stickleback; subclass Actinopterygii, order Gasterosteiformes) A small family of marine, brackish, and freshwater fish that tend to have torpedo-shaped bodies, a small mouth, small fins, and a series of separate sharp spines on the back preceding the dorsal fin.
		Harpadontidae (Bombay duck; subclass Actinopterygii, order Myctophiformes) A family of marine and brackish-water fish that have a torpedo-shaped body, a compressed head with small eyes and a large mouth, a single dorsal and an adipose fin, and a trilobed tail fin.
		Poeciliidae (live-bearer, guppy; subclass Actinopterygii, order Atheriniformes) A large family of small, freshwater and brackish-water fish that generally inhabit freshwater streams, although several species can be found in saline coastal marshes.
	www.encyclopedia.com /SearchResults.aspx?Q=brackish&StartAt=11 (713 words)

	Actinopterygii - Wikipédia
		Os Actinopterygii são os peixes com nadadeiras suportadas por "raios" ou lepidotríquias, esqueleto interno tipicamente calcificado e aberturas branquiais protegidas por um opérculo ósseo.
		Tradicionalmente o grupo dos Actinopterygii tem sido dividido em 3 outros grupos reconhecidos: os Chondrostei, Holostei, e Teleostei, no entanto, o segundo nome é parafilético e tende a ser abandonado.
		Tradicionalmente, foram reconhecidas 3 grupos de Actinopterygii: Chondrostei, Holostei e Teleostei.
	pt.wikipedia.org /wiki/Actinopterygii (186 words)

	Actinopterygii - Wikipedia, the free encyclopedia
		They are the dominant group of vertebrates, with over 27,000 species ubiquitous throughout fresh water and marine environments.
		Traditionally three grades of Actinopterygii have been recognized: the Chondrostei, Holostei, and Teleostei.
		The second is paraphyletic and tends to be abandoned, however, while the first is now restricted to those forms closer to extant Chondrostei than to the other groups.
	en.wikipedia.org /wiki/Actinopterygii (116 words)

	Actinopterygii - Biocrawler (Site not responding. Last check: )
		They are traditionally treated as a subclass of the Osteichthyes, or bony fish, but as that group is paraphyletic they may be treated as a full class.
		Traditionally three grades of Actinopterygii have been recognized: the Chondrostei, Holostei, and Teleostei.
		The second is paraphyletic and tends to be abandoned, however, while the first is now restricted to those forms closer to extant Chondrostei than to the other groups.
	www.biocrawler.com /encyclopedia/Actinopterygii (148 words)

	FISH LINKS
		Osteichthyes are the bony fish, a group paraphyletic to the land vertebrates and which sometimes includes them.
		Most fish within the old term osteichthyes belong to the Actinopterygii.
		The Osteichthyes were traditionally treated as a class of vertebrates, with subclasses Actinopterygii and Sarcopterygii, but newer schemes may divide them into several separate classes such that Actinopterygii and Sarcopterygii are now a class in themselves (what you are being taught).
	www.colorado.edu /eeb/courses/3770darmstrong/Fish.htm (241 words)

	Introduction to the Actinopterygii
		The name means "ray-finned," for unlike the Chondrichthyes, the fins of the Actinopterygii are webs of skin supported by bony or horny spines.
		Most actinopterygians have complex skeletons of true bone (sturgeons and paddlefishes are exceptions).
		For more information, try the Actinopterygii pages from the Tree of Life at the University of Arizona.
	www.ucmp.berkeley.edu /vertebrates/actinopterygii/actinintro.html (151 words)

	Definition of actinopterygii - Merriam-Webster Online Dictionary
		Learn more about "actinopterygii" and related topics at Britannica.com
		Find more about "actinopterygii" instantly with Live Search
		See a map of "actinopterygii" in the Visual Thesaurus
	www.m-w.com /dictionary/actinopterygii (38 words)

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