
	Where results make sense

Topic: Harpetida

Related Topics

Nektaspida

Proetida

Ptychopariida

Corynexochida

Lichida

Phacopida

Redlichiida

Asaphida

Agnostida

In the News (Fri 11 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Harpetida - Wikipedia, the free encyclopedia
		The Harpetida are characterized among trilobites by bearing a semicircular brim around the cephalon (head) which is often perforated by small pores.
		The Harpetida were formerly included in the family Ptychopariida, but were recently given their own order (Ebach and McNamara 2002).
		However, this is in conflict with the use of the same name for a family of extant molluscs and that taxon had precedence.
	en.wikipedia.org /wiki/Harpetida (234 words)

	Harpetida Fact Sheet
		Harpetidae: Arraphus, Bohemoharpes (=Declivoharpes; =Unguloharpes), Bowmania, Brachyhipposiderus, Conococheaguea, Dolichoharpes, Dubhglasina (=Australoharpes; =Sinoharpes), Eoharpes (/Harpina), Eotrinucleus, Harpes (=Helioharpes; =Reticuloharpes), Heterocaryon, Hibbertia (/Platyharpes; =Harpesoides; =Metaharpes; =Paraharpes; =Thorslundops; =Wegelinia), Kathrynia, Kielania (=Lowtheria), Lioharpes (=Fritchaspis), Paleoharpes, Scotoharpes (=Aristoharpes; =Selenoharpes).
		As Proetida, Asaphida, and now Harpetida are distinguished from the old Ptychopariida clade, the subclass Librostoma serves to highlight the shared Ptychopariida ancestry.
		In 1987 Harpetidae Hawle and Corda 1847 and Harpididae Whittington 1950 were added to the official list "Names in Zoology" per Opinion 1436 of the ICZN.
	www.trilobites.info /ordharpetida.htm (354 words)

	Harpetida - One Language (Site not responding. Last check: 2007-10-09)
		Harpetida is one of the nine orders of the extinct arthropod class Trilobita.
		The Harpetida are characterized among trilobites by bearing a convex brim, often perforated by small pores.
		This brim was thought to serve as a filter-feeding chamber.
	www.onelang.com /encyclopedia/index.php/Harpetida (98 words)

	James Tarver - Abstracts (Site not responding. Last check: 2007-10-09)
		However, at genus level the fossil record is incomplete; at this level there is little variation in their completeness between different stratigraphic and taxonomic groupings although different geographic regions show marked differences due to collection effort.
		The most complete aspects of the trilobite fossil record are the North American, Ordovician and Harpetida subsets of data whilst the African, Carboniferous and Proetida are the least complete.
		The role of synonyms has had little effect on perceived levels of completeness; the rate of synonymy has varied little during the past 180 years, but has decreased through time from 23% in 1900 to 18% in 1975.
	eis.bris.ac.uk /~jt4014/Abstracts/Abstract1.html (285 words)

	orderharpetida
		Classification scheme of the order Harpetida (from Ebach and McNamara, 2002).
		Protaspid larvae of only 1 (yellow and bold) of the 3 families have been described so far.
		Geological Society of America and University of Kansas Press, Lawrence, 530 p.
	www.geocities.com /barracudaaa/orderharpetida.html (123 words)

	Scotoharpes (Aristoharpes) Moroccan Trilobite
		Size: (25.4mm=1 inch): 45 mm long by 29 mm wide on a 100 by 60 mm matrix.
		Description: Elegant example of a member of the newly erected (2002) Order Harpetida, with many fine details present.
		Previously, this one was known as Aristoharpes (taxonomy of trilobites seems to be perpetually in a state of flux).
	www.fossilmall.com /EDCOPE_Enterprises/trilobites/MT178/MT178.htm (172 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.
		A subclass-level organisation for the remaining orders has not emerged.
		Ebach, M.C.; McNamara, K.J. A Systematic Revision of the Family Harpetidae (Trilobita).
	www.peripatus.gen.nz /Taxa/Arthropoda/Trilobita/TriSys.html (2651 words)

	Among My Trilobites
		Yahoo Trilobite Club member Sam Gon III has done a great job of presenting the salient points of current trilobite classification according to his synthesis of the current, but incomplete Treatise on Invertebrate Paleontology,Part O with its 1959 predecessor, the original Treatise.
		Most orders did not exist throughout the entire Paleozoic, but several did have members extending through several periods.
		To see the Devonian Period Part 2: Phacopida.
	tyra-rex.com /trilobite/t.html (4896 words)

	Fossilien > Harpetida (Site not responding. Last check: 2007-10-09)
		Harpes (click on images for pictorial guide) Entomaspis.
		For more general information about the Order Lichida, visit Sam Gon's Lichida Summary page: AGNOSTIDA: HARPETIDA: PTYCHOPARIIDA: REDLICHIIDA: ASAPHIDA: PHACOPIDA: CORYNEXOCHIDA: PROETIDA
		TRILOBITEN - Fossilien erzaehlen die Geschichte des Lebens - Harpetida...
	www.fossilien.in /Fossilien/Harpetida.cgi (135 words)

Try your search on: Qwika (all wikis)