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Topic: Ostracoderm

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	OSTRACODERM (Site not responding. Last check: 2007-11-03)
		Ostracoderms are any of several groups of extinct, primitive, jawless fishes that were covered in an armor of bony plates.
		Unlike invertebrates that use cilliated motion to move food, ostracoderms used their muscular gill pouch to create a suction that pulled in small and slow moving prey.
		The ostracoderms are placed in the Class Agnatha along with the extant Subclass Cyclostomata, which includes lampreys and hagfishes.
	www.yotor.org /wiki/en/os/Ostracoderm.htm (342 words)

	Ostracoderm.htm (Site not responding. Last check: 2007-11-03)
		The head armor is especially well developed in Hemicyclaspis, an ostracoderm of the "Cephalapsis" type, in which the head is flattened and expanded into a large
		Ostracoderms lacked the paired (pectoral and pelvic) fins of more advanced fish.
		In some cases, small spines were present at the points where paired fins develop in higher fishes.
	bill.srnr.arizona.edu /classes/182/Ostracoderm.htm (70 words)

	Nearctica - Paleontology - Vertebrates - Vertebrate Phylogeny
		These ostracoderms represent many evolutionary lines and are generally more "fish-like" than their surviving relatives.
		One line of "ostracoderms" developed the first opposible jaw by the modification of one of the cartilaginous arches in their gills.
		These early jawed fish, appearing in the Silurian, are known as placoderms and gave rise in their turn to the Chondrichthyes (sharks and rays) and the Osteichthyes (bony fish) in the Devonian.
	www.nearctica.com /paleo/verts/vertphy.htm (406 words)

	Heterostraci
		Dineley, D. and Loeffler, E. Ostracoderm faunas of the Delorme and associated Siluro-Devonian formations, North West Territories, Canada.
		Tarrant, P.R. The ostracoderm Phialaspis from the Lower Devonian of the Welsh Borderland and South Wales.
		White, E. The ostracoderm Pteraspis Kner and the relationships of the agnathous vertebrates.
	tolweb.org /tree?group=Heterostraci&contgroup=Pteraspidomorphi (1195 words)

	Home
		This allowed the advancement from cilia to the evolution of tooth plates in some agnathans, although filter feeding is still employed.
		The next group to consider is the ostracoderms, which are jawless but well armoured vertebrates.
		There are 4 main orders within the ostracoderm group.
	cal.man.ac.uk /student_projects/2003/mnzo0mlk/lecture3.htm (439 words)

	[No title]
		Anaspids differ from most other "ostracoderms" by their dermal skeleton not forming a massive headshield, although their head is covered by both large bony plates and minute scales.
		Also, contrary to most other "ostracoderms", they have a rather slender and laterally compressed body, with the gill openings extending behind the eyes in a slanting row, as in lampreys.
		Current phylogenies, however, imply that anaspids, along with other "ostracoderms", are more closely related to the gnathostomes than to lampreys.
	ag.arizona.edu /tree/eukaryotes/animals/chordata/anaspida/Anaspida.nex (1048 words)

	09 (Site not responding. Last check: 2007-11-03)
		Define and distinguish between gnathostomes, tetrapods, and amniotes.
		Define and compare the groups Myxini, Cephalaspidomorphi, ostracoderms, conodonts, and placoderms.
		Describe and distinguish between the classes Chondrichthyes and Osteichthyes, noting the main traits of each group.
	www.sbs.utexas.edu /delia/bio213/09.htm (319 words)

	Review Sheet for"Eyewitness: The Human Machine"
		Both a lamprey and a hagfish lack ___ ________________________________________________.
		Ostracoderm (armored fish) fossils from 400 million years ago show a relatedness to lampreys.
		Ancient seabeds can be found on what is now dry land.
	www.biologie.uni-hamburg.de /b-online/library/crone/3051/vt1181.html (319 words)

	Hyde Slides: General Historical Geology - PreCambrian-Paleozoic
		Section across body at fore fis shows pectoral muscles, muscles around neck, and scales of a recently eaten Paleoniscus.
		Devonian ostracoderm; 3 views of Ptericthys milleri, Agassiz.
		Devonian ostracoderm; upper and lower surfaces of Bothriolepis.
	geology.cwru.edu /~huwig/catalog/historical.html (1019 words)

	Glossary o to z
		ostracoderm fishes: primitive jawless fishes that lived through the early Ordovician to the late Devonian periods (470 to 370 million years ago).
		Their bodies are covered with a thick armour of bony plates and dermal scales.
		Pteraspidomorphi - ostracoderms (ostracoderm is a term used for any armored, jawless fish, it is no longer considered a taxon).
	www.ecotao.com /holism/glosoz.htm (6830 words)

	Find in a Library: Ostracoderm faunas of the Delorme and associated Siluro-Devonian formations North West Territories ...
		Find in a Library: Ostracoderm faunas of the Delorme and associated Siluro-Devonian formations North West Territories Canada
		Ostracoderm faunas of the Delorme and associated Siluro-Devonian formations North West Territories Canada
		WorldCat is provided by OCLC Online Computer Library Center, Inc. on behalf of its member libraries.
	www.worldcatlibraries.org /wcpa/ow/5c4a1c3aa73ac38d.html (78 words)

	Comparative Anatomy Topic 3 - Fishes (Site not responding. Last check: 2007-11-03)
		It is helpful to think of the jawless fishes as a group because they share some similarities such as the absence of jaws and paired fins.
		Agnatha can be broken into four taxa, Conodonta (extinct conodonts), Myxini (hagfishes), Pteraspidomorphi (extinct ostracoderms), and Cephalaspidomorphi (other extinct ostracoderms and lampreys).
		Cephalaspidomorphi - ostracoderms and lampreys (ostracoderm is a term used for any armored, jawless fish, it is no longer considered a taxon)
	www.auburn.edu /academic/classes/zy/0301/Topic3b/Topic3b.html (1246 words)

	Free Essay Biology Test: Cells (Site not responding. Last check: 2007-11-03)
		A 5 page discussion of one of the more notable discoveries in marine biology, the discovery of Ostracoderm fossils in marine substrate.
		This 5 page paper outlines the view that the study of cellular function and the variety of different techniques used in cell biology relate to the complexi...
		Click here to browse 60,000 essays & term papers.
	www.echeat.com /essay.php?t=25641 (830 words)

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