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Topic: Osteostraci

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	Cephalaspidomorphi - Wikipedia, the free encyclopedia
		Some biologists no longer use the name Cephalaspidomorphi because relations among osteostraci and anaspida are unclear, and the affinities of the lampreys are also contested.
		Others have restricted the cephalaspidomorphs to include only groups more clearly related to the Osteostraci, such as Galeaspida and Pituriaspida, that were largely unknown in the 1920s.
		Many reference works still regard Cephalaspidomorphi as a Linnean class whose sole living representaties are the lampreys.
	en.wikipedia.org /wiki/Osteostraci (258 words)

	Palaeos Vertebrates 50.600 Thelodonti: Osteostraci
		The Osteostraci share a number of unique characteristics - synapomorphies - with the gnathostomes or jawed fish (true bone, epicercal tail, sclerotic ring, endolymphatic openings, dorsal jugular vein, concentrated paired fins) and were clearly closely related.
		The Osteostraci are biogeographically limited to the Euramerican Province (Laurentia and Baltica), and are useful biostratigraphic indicators.
		The brain turns out to be quite similar to the lamprey brain, which is also taken as a sign that the Osteostraci are but a fruit stand on the broad highway to the gnathostomes.
	www.palaeos.com /Vertebrates/Units/050Thelodonti/050.600.html (2730 words)

	New Page 5 (Site not responding. Last check: 2007-10-11)
		The Osteostraci or Cephalaspids as they were once known are the most ‘famous’ of all fossil agnathans.
		Most Osteostraci have a horseshoe-shaped headshield with sharp posterolateral cornual processes, to the inner margins of which the pectoral fins are attached.
		As with all Osteostraci, they also have a network of sensory fields made up of loose platelets of bone (not differentiated in ateleaspis) located along the mid-line and the lateral edges of the headshield.
	www.btinternet.com /~vendian/FOSSILWEB/new_page_5.htm (639 words)

	Pituriaspida - Wikipedia, the free encyclopedia
		They are known only by two genera, Pituriaspis and Neeyambaspis found in a single sandstone location in Queensland, Australia.
		The better studied genus - Pituriaspis, which resembles the Osteostraci, has an elongate headshield.
		It extends posteriorly to form a long abdominal division which probably reached the anal region.
	en.wikipedia.org /wiki/Pituriaspida (141 words)

	Osteostraci
		The Osteostraci include a major clade, the Cornuata, characterized by pointed lateral processes of the headshield, in front of the paired fins (homoplastic with the cornual processes of the Galeaspida and Pituriaspida), and a few primitive genera (Ateleaspis, Aceraspis, Hirella, Hemicyclaspis) which represent "basal" osteostracans.
		Among all "ostracoderms", osteostracans (possibly along with pituriaspids) share the largest number of uniquely derived characteristics with the gnathostomes: cellular bone, sclerotic ring in eyes, paired fins containing musculature, and epicercal caudal fin.
		Janvier, P. The relationships of the Osteostraci and Galeaspida.
	tolweb.org /tree?group=Osteostraci&contgroup=Vertebrata (1906 words)

	Vertebrata
		The "ostracoderms" are represented by five major groups, four of which are almost certainly clades: the Heterostraci, Osteostraci, Galeaspida, Anaspida, and Thelodonti (the monophyly of the latter being debated, Thelodonti page).
		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.
		Although there are variations as to the position of certain taxa, the Galeaspida and Osteostraci constantly group together with the Gnathostomes, whereas the Astraspida, Eriptychiida, Arandaspida, and Heterostraci form a clade, the Pteraspidomorphi, albeit poorly supported.
	tolweb.org /tree?group=Vertebrata&contgroup=Craniata (1770 words)

	Palaeos Vertebrates 50.700 Thelodonti: Cornuata
		Links: Osteostraci; Cephalaspis tenuicornis; Biology 356; Spittal Quarry; Le Dévonien (10/10); New Page 1 (some of these look almost too good to be true -- but interesting photos nonetheless); fossils.pdf; fish.doc; forelasning4.pdf (Swedish); Ken Mannion Fossil Gallery; Dineley.
		Links: Osteostraci; 309.htm; AGP, Volume 46, Number 3-4, 1996; 118.htm; PPT Slide; Home Page; New Page 1 (two gorgeous pictures of Zenaspis).
		Links: Osteostraci; 309.htm; 118.htm; PPT Slide; Early Devonian osteostracans from Severnaya Zemlya, Russia.
	www.palaeos.com /Vertebrates/Units/050Thelodonti/050.700.html (685 words)

	Palaeos Vertebrates 020.000 Craniata Overview
		The standard texts generally reflected craniates evolving sometime in the Ordovician, with vertebrates arising somewhat thereafter, perhaps during an apparent secondary "explosion" in the Silurian.
		Eventually, the Osteostraci emerged, and some Osteostracan or a closely related forms developed jaws and paired pectoral limbs -- all at about the same time -- resulting in another quick radiation of gnathostome forms during, perhaps, the Late Silurian.
		The Osteostraci have never been satisfactory gnathostome ancestors because they are very highly derived forms.
	www.palaeos.com /Vertebrates/Units/020Craniata/000.html (2370 words)

	Osteostraci
		"Osteostraci" is generally used as a noun (proper) -- approximately 100.00% of the time.
		"Osteostraci" is used about 2 times out of a sample of 100 million words spoken or written in English.
		Its rank is based on over 700,000 words used in the English language.
	www.websters-online-dictionary.org /Os/Osteostraci.html (317 words)

	InfoHub - View Single Post - Zenaspis fossil photograph
		As is mentioned in the taxonomy, Zenaspis is in the class Osteostraci.
		About 200 fossil species of Osteostraci have been identified.
		Most of them have a characteristic horseshoe-shaped head, which consists of a massive endoskeletal skull, covered with a shield of dermal bone.
	www.infohub.com /forums/showpost.php?p=9478&postcount=1 (371 words)

	Uncategorized (Site not responding. Last check: 2007-10-11)
		The nose lining mature into new those of modern jawless fish fish osteostraci.
		Olfactory neurons, which produce osteostraci the osteostraci, or.
		Each of these new osteostraci, or osteostracans, are clade (about.
	fishbaking.news05.info /category/Uncategorized (1224 words)

	VERTEBRATE PALEONTOLOGY
		Denison, R. Early Devonian Fishes from Utah: Part I. Osteostraci.
		Denison, R. Evolution and classification of the Osteostraci.
		Denison, R. The exoskeleton of the early Osteostraci.
	www.geo.utexas.edu /courses/389v/refs.htm (3330 words)

	Osteostraci
		The Osteostraci, or osteostracans, are a major clade (about 200 species) of fossil, armored jawless vertebrates which lived from the Early Silurian (about 430 million years) to the Late Devonian (about 370 million years).
		The Early Silurian Ateleaspis is regarded as the most generalized osteostracan.
		Tree of Life design and icons copyright © 1996 David Maddison and Wayne Maddison.
	www.caf.wvu.edu /~rwhitmor/wman224/Links/Osteostraci.htm (1320 words)

	List all Literature
		Adrain, J. M., and Wilson, M. Early Devonian cephalaspids (Vertebrata: Osteostraci: Cornuata) from the southern Mackenzie Mountains, N.W.T., Canada.
		GREEN, T. and G. Late Eocene otolith-based fishes from the Moodys Branch Formation in Louisiana and Mississippi and their paleoecological implications.
		Hanke, G. F., Davis, S. P., and Wilson, M. Description of a new Tetanopsyrus species and phylogenetic analysis of select Early Devonian Acanthodii.
	www.deepfin.org /listLiterature.php (14061 words)

	Home (Site not responding. Last check: 2007-10-11)
		Diagnosis: Both Thelodonti and Galeaspida display potntial synapomorphies with Gnathostomata and Osteostraci.
		Presence of scales with concentric layers of dentine and enamel surrounding a pulp cavity.
		Potential synapomorphies of Galeaspida, Osteostraci, and Gnathostomata include:
	www.geol.umd.edu /~jmerck/honr219d/cladogram/node/unnamed2.html (34 words)

	DeepFin.Org - Phylogeny of All Fishes
		On the dentition of Miroscyllium Shirai and Nakaya, 1990 (Chondrichthyes: Squaliformes, Etmopteridae) with comments on the fossil record of Lantern-sharks.
		Early Devonian cephalaspids (Vertebrata: Osteostraci: Cornuata) from the southern Mackenzie Mountains, N.W.T., Canada.
		paleontology, fossils, Heterostraci, Thelodonti, Osteostraci, Acanthodii, Teleostei, early vertebrat
	www.deepfin.org /listLiteratureTemplate.php (3802 words)

	Xenical Oil In Toilet - Cheap Generic Drugs (Site not responding. Last check: 2007-10-11)
		Procumbent Naiadales conglutinate the youngish fire department with uncompetitive
		xenical oil in toilet Protozoological Osteostraci strickle the Scots shire with debauched pennyweight.
		Oversubscribed extracurricular activity conn the rentable frequency-response curve with disqualified koto.
	www.techlocus.com /xenical/xenical-oil-in-toilet.html (2246 words)

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