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	Asaphida - Wikipedia, the free encyclopedia
		Asaphida is a large, morphologically diverse order of trilobite found in strata dated from the Middle Cambrian boundary to the Silurian.
		The Asaphida generally have cephalon (head) and pygidium (tail) parts similar in size, and most species have a prominent median ventral suture.
		One Asaphida line, the superfamily Asaphoidea, shows a continuous evolution of eyestalks, from ones with mere eye stubs to Asaphus kowalewskii, a trilobite popular with collectors that sported long, eye-tipped stalks.
	en.wikipedia.org /wiki/Asaphida (303 words)

	TRILOBITE ORDER ASAPHIDA FACT SHEET
		The assumption is that the ventral median suture evolved only one time, thereby uniting all members bearing that feature as a monophyletic group.
		As a stem group composed of primitive asaphid families (such as Anomocaridae), the Anomocarioidea is paraphyletic, giving rise to the derived superfamilies, and presumably including the most primitive transitional taxa for each (such as some Auritamiidae).
		The ontogeny of the advanced members of the Asaphida (e.g., Asaphoidea, Trinucleioidea, Cyclopygoidea) are consistent, with an effaced, globular protaspis.
	www.trilobites.info /ordasaphida.htm (1354 words)

	Asaphida thyroid Asaphida (Site not responding. Last check: 2007-08-31)
		Shop and compare great deals on asaphida and millions of other related products at MonsterMarketplace.
		Asaphida is a large, morphologically diverse order of trilobite found in strata dated from the Middle Cambrian boundary to the Upper Ordovician.
		One Asaphida line, the superfamily Asaphoidea, shows a continuous evolution of eyestalks, from ones with mere eye stubs to Asaphus kowalewski, a trilobite popular with collectors that sported long, eye-tipped stalks.
	www.find-ask.com /Encyclopedia/Asaphida/Asaphida.html (380 words)

	High Level Trilobite Systematics
		The last four orders listed – Ptychopariida, Harpetida, Asaphida and Proetida – share (at least in primitive forms) a natant hypostomal condition, leading Fortey 1990 to propose a phylogenetic relationship between these forms and a new subclass, Libristoma, to group them.
		Higher Asaphida also have a distinctive inflated protaspis (Fortey 1990, p.
		Discussion: The superfamily Anomocaroidea represents the primitive morphology of the Asaphida, which includes a number of families retaining the natant hypostomal condition.
	www.peripatus.gen.nz /Taxa/Arthropoda/Trilobita/TriSys.html (2651 words)

	Trilobite systematics: The last 75 years Journal of Paleontology - Find Articles
		The coherence, or otherwise, of Proetida, Asaphida, Corynexochida and the lichid/odontopleurid groups will be resolved by such studies.
		One of the first cladograms ever published featuring fossils was used to illustrate inter-relationships between species of the Devonian genus Phacops (Eldridge, 1972).
		Possibly the first application to a wholly fossil group of the computer-based parsimony analysis known as PAUP-now used routinely on almost any laptop--was by Fortey and Chatterton (1988) to analysis relationship in Asaphida.
	www.findarticles.com /p/articles/mi_qa3790/is_200111/ai_n8958763/pg_29 (1022 words)

	In order to distinguish trilobites from one another
		The recognition of Asaphida, Proetida, and Harpetida as orders is relatively recent, as in the 1959 Treatise they were all included within the very large order Ptychopariida.The Ptychopariida and Harpetida maintained the natant state until their extinction at the end of the
		The great extinction event at the end of the Ordovician period greatly affected trilobites, as this caused the extinction of the Olenina order, Agnostida order, and the vast majority of the Asaphida order.
		The remainder of the Asaphida (superfamily Trinucleioidea) were extinct before the end of the
	www.k12.nf.ca /gc/Science/Geology03/trilobites/Orders.htm (564 words)

	Trilobite Page
		Most of the clades that became extinct were already in long-term decline, whereas most of the clades that survived suffered no sustained diversity reduction after the extinction.
		Today there are nine generally recognised orders of trilobites: the Agnostida, Redlichiida, Corynexochida, Lichida, Phacopida, Ptychopariida, Harpetida, Asaphida and Proetida.
		One piece of advice: if you are interested in buying Wolchow River Asaphida, it will almost certainly be less expensive to buy them directly from Russia – specifically from Arkadiy and his colleagues at the St Petersburg Paleontological Laboratory – than from anywhere in the US.
	www.peripatus.gen.nz /Taxa/Arthropoda/Trilobita/Trilobite.html (3079 words)

	British Trilobite Salterolithus caractaci - UK Trilobites
		Salterolithus caractaci (Order: Asaphida; Superfamily: Trinucleoidea; Family: Trinucleidae) is a classic British Ordivician trilobite from the North of England in Wales.
		The Trincleioid trilobites like Salterolithus are highly specialized, but fall within the Asaphida via their asaphoid protaspides and the presence of the ventral median suture in at least the more primitive representatives of the superfamily.
		The characteristic morpholgy has a broad Cephalic fringe, sloping outward, bilaminar, with numerous pits on external surfaces, extending posterolaterally somewhat behind rest of cephalon.
	www.fossilmuseum.net /Fossil_Galleries/Trilobites-UK/Paratrinucleus/Paratrinucleus.htm (137 words)

	Trilobite- EnchantedLearning.com
		Some could roll up into a ball, and some could burrow into the sea floor.
		Classification:Trilobites belonged to the Kingdom Animalia (animals), Phylum Arthropoda (arthropods), Superclass Trilobitomorpha, Class Trilobita, Orders (8): Agnostida, Asaphida, Corynexochida, Lichida, Phacopida, Proetida, Ptychopariida, Redlichiida.
		Just click on an animal's name to go to that information sheet.
	www.zoomschool.com /subjects/invertebrates/trilobite (308 words)

	Onnia superba Moroccan Trilobites
		Name: Onnia superba (Trilobites) Order Asaphida; Family Trinucleidae
		This is SUPERB death assemblage of a member of the Order Asaphida, Family Trinucleidae from the Ordovician deposits of Blekos, Morocco known as Onnia superba.
		Cointained within this 6.7 inch by 5.7 inch matrix plaque are TEN examples of the type 0.5 inch - 0.8 inch wide at the genal spines.
	www.fossilmall.com /Science/TrilobitesMorocco/Onnia_superba/Onnia_superba.htm (158 words)

	Isotelus gigas Trilobite
		Name: Isotelus gigas (Trilobites); (Order: Asaphida; Family: Asaphidae)
		Size (25.4mm=1 inch): 92 mm long by 53 mm wide on a 90 mm by 122 mm matrix
		Isotelus gigas is an Asaphid trilobite (Order: Asaphida; Family: Asaphidae) coming from the Ordovician Lindsay Formation strata of Bowmanville, Canada.
	www.fossilmall.com /EDCOPE_Enterprises/trilobites/Trilobite-19/Trilobite-19.htm (244 words)

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