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Topic: Anaspida

	Palaeos Vertebrates 20.000 Craniata
		The Anaspida are all narrow-bodied jawless vertebrates characterized by triradiate postbranchial spines.
		The Anaspida occur mostly in Norway and Scotland, with some sparse records from eastern Canada, the Baltic area, and a single perhaps dubious record of a "birkeniid" from China.
		One of the possible phylogenies of the Anaspida suggests a tendency towards the reduction of the number of gill openings, enlargement of the median dorsal scutes, reduction of anal fin, but is neither corroborated nor refuted by stratigraphy, since most anaspid taxa are of the same age.
	www.palaeos.com /Vertebrates/Units/020Craniata/100.html (970 words)

	Anaspida
		The Anaspida, or anaspids, are a group of fossil, jawless vertebrates which lived in the Silurian (-430 to -410 million years ago).
		Although the latter two genera share with the Anaspida a strongly hypocercal tail, a characteristic which is unknown in other groups, they have no mineralized exoskeleton and, therefore show no tri-radiate postbranchial spine.
		Ritchie, A. New light on the morphology of the Norwegian Anaspida.
	tolweb.org /tree?group=Anaspida&contgroup=Vertebrata (1211 words)

	Anaspida
		"Anaspida" is a common misspelling or typo for: Amnesia, Antacid, Antipodal, Antipode, Inside, Insipid, Unsaid.
		"Anaspida" is generally used as a noun (proper) -- approximately 100.00% of the time.
		"Anaspida" is used about 2 times out of a sample of 100 million words spoken or written in English.
	www.websters-online-dictionary.org /An/Anaspida.html (279 words)

	Vertebrata
		In the beginning of the twentieth century, Kiaer (1924) and Stensiö (1927) showed that the Anaspida and Osteostraci share with lampreys a median, dorsally placed "nostril" (in fact a nasohypophysial opening) and suggested to include these three groups in a clade Cephalaspidomorphi.
		In the case of the Euconodonta, Anaspida and Pituriaspida, this uncertainty is largely due to the scarcity of the characters available from the material (in particular as to the internal anatomy).
		In the case of the Thelodonti, it is due to their controversial status, as they are likely to be a paraphyletic assemblage of stem Heterostraci and possibly stem forms of other "ostracoderm" groups, yet some authors regard them as a clade (see Thelodonti page).
	tolweb.org /tree?group=Vertebrata&contgroup=Craniata (1770 words)

	Palaeos Vertebrates 020.000 Craniata Overview
		In this view of these taxa, the Petromyzonida are the only surviving lineage of the ancient agnaths (jawless vertebrates), represented only by the parasitical lampreys, "living fossils" which first appeared (in only slightly different form) during the Carboniferous period.
		In this view, the Anaspida (in the broad sense) can be included under the Petromyzonida (or vice versa!).
		The Birkeniiformes correspond to the Anaspida in the narrow or strict sense.
	www.palaeos.com /Vertebrates/Units/020Craniata/000.html (2370 words)

	Sensible Election \| Fascist Corporate Pimp Bush AKA Anti-Christ
		The automatic assumption that he has some how been offensive with one word, a period and a two character smiley is insane.
		I have come to a conclusion, Anaspida is the next incarnation.
		I'd also like to see stats on how many times it denies that the new character is actually it and how many posts it takes before it breaks down and admits it.
	sensibleelection.com /entry.php/1283 (2359 words)

	Vertebrata
		Pteraspidomorpha: head armor composed of large, median ventral and dorsal dermal plates; tubercles on the dermal plates shaped like oak leafs.
		Anaspida: at least one, tri-radiate spine behind the gills.
		VIIB2: perichondral bone or calcification; externally open endolymphatic duct.
	homepage.mac.com /pfhreak/paleontology/clade/V/vertebrata.html (348 words)

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