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Topic: Phacopida

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	Phacopida - Wikipedia, the free encyclopedia
		It is made up of a morphologically diverse group of related suborders.
		The origin of the Phacopida order is uncertain.
		Schizochroal eyes are compound eyes with up to around 700 separate lenses.
	en.wikipedia.org /wiki/Phacopida (265 words)

	Fossilien > Phacopida
		Trilobite Order Phacopida is large and diverse, comprising the related...
		Die Phacopida bilden eine groÃe, attraktive Gruppe, die vom Unteren...
		Class Trilobita is an extinct class of marine arthropods distinguished by an exoskeleton, which is divided into three lobes; hence the name tri-lobe-ite.
	www.fossilien.in /Fossilien/Phacopida.cgi (135 words)

	PHACOPIDA FACT SHEET
		This is consistent with the inclusion of Phacopida as one of the Librostoma (Fortey 1990).
		The unity of the suborders Calymenina, Cheirurina and Phacopina via similar ontogeny has been accepted by the vast majority of trilobite workers.
		Since ontogeny patterns define the Phacopida, the search for the sister group will likely require an assessment of the protaspides and meraspides of candidate taxa (such as Calymenidius).
	www.trilobites.info /ordphacopida.htm (942 words)

	orderphacopida
		Protaspides of representatives of nine of the sixteen families have been described and, within each suborder, larvae of at least fifty percent of the families are known.
		Considering this, the early ontogeny of the Phacopida is probably the best known of all trilobite orders.
		Protaspid larvae of 9 (yellow and bold) of the 16 families have been described so far.
	www.geocities.com /barracudaaa/orderphacopida.html (541 words)

	Ordovician (Whiterock) calymenid and encrinurid trilobites from the Precordillera of Argentina Journal of Paleontology ... (Site not responding. Last check: 2007-11-07)
		Most Phacopida treated herein occur in strata of the Lower Caradoc Nemagraptus gracilis Zone, which Brussa (1994, 1996) recognizes through 150 metres in the upper part of the Las Aguaditas Formation.
		A calymenid is documented from the Paraglossograptus tentaculatus Zone/Eoplacognathus suecicus Zone, of Llanvirn age.
		One of the few members of the Phacopida identified by Baldis and Pothe (1995), Platycalymene trapezoidalis, is revised on the basis of more complete material and its affinities are reevaluated.
	www.findarticles.com /p/articles/mi_qa3790/is_199807/ai_n8794099 (819 words)

	New Page 1 (Site not responding. Last check: 2007-11-07)
		This is a nice prone example of Phacops speculator (Order Phacopida, Suborder: Phacopina; Superfamily: Phacopoidea; Family: Phacopidae), a classic trilobite of the Devonian strata of Morocco (Hamar Laghdad Formation – near Erfoud, Morocco).
		It has a natural dark brown exoskeleton, nicely preserved, and contrasting beautifully with the light reddish-brown matrix.
		As a member of Order Phacopida, this trilobite shares the distinction of schizochroal eyes only with other members of the Order.
	www.housepainter.net /fossils/Phacops.htm (109 words)

	Karen's Komments November 2003
		This new specimen is dated to 395 MYA, belongs to the Order Phacopida and is named Erbenochile erbeni.
		Trilobites normally have two kinds of eyes – holochroal made up of many (up to a thousand) minute lenses, and schizochroal with fewer larger biconvex lenses often separated by sclera (includes the Phacopida).
		This fossil has eyes that are like twin towers with 560 lenses in vertical rows of 18 that are curved strongly from front to back.
	www.esconi.org /Karens_Komments_Nov_2003.htm (1069 words)

	In order to distinguish trilobites from one another (Site not responding. Last check: 2007-11-07)
		They share several characters with the Ptychopariida (including a few species with natant hypostomes), so although the hypostomal condition of the Phacopida is typically conterminant (and impendent in some advanced Phacopina), which implies that they may have origininated with the natant Ptychopariida, making the Phacopida another late addition to the Libristomate subclass.
		However, many people point out their hypostomal condition, which ended at the same time, and similarities in the exoskeleton tuberculation of the Phacopida and Lichida orders.
		Therefore, the sister group of the Phacopida remains unclear and debateable.
	www.k12.nf.ca /gc/Science/Geology03/trilobites/Orders.htm (564 words)

	paleolab9trilobites
		Trilobites rebounded slightly in Devonian time, and it is during this time that the Phacopida expanded.
		Only two orders survived the Late -Devonian extinction events, the Phacopida and the Proetida.
		These two orders continued through late Paleozoic time, although became only a rare component of the marine benthic fauna, and typically associated with reef environments.
	www.personal.kent.edu /~alisonjs/paleo/paleolab9trilobites.htm (854 words)

	Trilobite Order Phacopida
		Trilobite Order Phacopida is large and diverse, comprising the related suborders Calymenina, Cheirurina, and Phacopina.
		Their grouping mainly derives from a shared and differentiating form during the early protaspid larval form period.
		The Calymenina share hypostomal characteristics with Order Ptychopariida, and Phacopida exhibits similar tuberculation with Lichida, confounding the Phacopids closest sister group.
	www.fossilmuseum.net /Fossil_Galleries/TrilobitesPhacopida.htm (82 words)

	Waynesville Formation, Wooster Paleontological Study (Fall 2000)
		The abundance's were actually extremely abundant fragments, they were just all over the place, but it would have been nice to find a nice mold of a whole trilobite, they were found in other formations of the Ordovician.
		Overall we found abundant fragments of the Order Phacopida in the Waynesville formation.
		This is an unaltered hard part remain of trilobite, probably from the pygidium and merely demonstrates that trilobites did exist in this assemblage.
	www.wooster.edu /geology/Geo250/PaleoFTW.html (1818 words)

	Class Trilobita: Order Phacopida: Fossil Groups: SciComms 05-06: Earth Sciences
		Class Trilobita: Order Phacopida: Fossil Groups: SciComms 05-06: Earth Sciences
		The preglabellar field is often very short or absent.
		Websites produced by students on the MSc Palaeobiology programme in the Department of Earth Sciences at the University of Bristol for academic year 2005-6
	palaeo.gly.bris.ac.uk /Palaeofiles/Fossilgroups/TrilPhac/character.html (304 words)

	History Detectives . Do It Yourself . Very Old Objects . Case File \| PBS
		These little fellows had rolled up into defensive balls before they died - and eventually turned into fossils.
		I also learned that my little bugs have a very big name: Arthropoda, Trilobita, Phacopida, Flexicalymene meeki.
		Ranger Jordan said my fossils were probably found near the Great Lakes (it was actually Ohio).
	www.pbs.org /opb/historydetectives/diy/old_objects_case.html (461 words)

	NSDL Metadata Record -- Dipleura dekayi
		PRI 41463; Dipleura dekayi; Dipleura; CLASS - Trilobite; ORDER - Phacopida; FAMILY - Homalonotidae; GENUS/SPECIES - Dipleura dekayi; ROCK UNIT - Skaneateles Formation, Hamilton Group; AGE - Middle Devonian (380 million years old); LOCALITY - North Brook field, New York, USA
		This large trilobite occurs in many different rock layers of the Hamilton Group in central New York, representing a span of several million years.
		Maybe they ate the sea worms and other creatures that preferred burrowing through these sediments
	nsdl.org /mr/80623 (125 words)

	High Level Trilobite Systematics
		This page reviews the Trilobita at the ordinal level.
		Keywords: Trilobite orders, Agnostida, Redlichiida, Lichida, Corynexochida, Phacopida, Ptychopariida, Harpetida, Asaphida, Proetida
		Discussion: The Phacopida comprises three suborders which share a distinctive protaspis type.
	www.peripatus.gen.nz /Taxa/Arthropoda/Trilobita/TriSys.html (2651 words)

	Class Trilobita: Order Phacopida: Fossil Groups: SciComms 05-06: Earth Sciences (Site not responding. Last check: 2007-11-07)
		They appeared in the Early Cambrian, diversified, declined rapidly in the Late Palaeozoic, before finally going extinct by the end of the Permian.
		The order Phacopida arose in the Ordovician and went extinct in the Devonian.
		This order is subdivided into three morphologically diverse
	palaeo.gly.bris.ac.uk /Palaeofiles/Fossilgroups/TrilPhac/index.html (139 words)

	Among My Trilobites
		To see the Ordovician Period Part 1 Asaphida
		To see the Ordovician Period Part 2 Lichida, Phacopida, Corynexochida, Ptychoparidia and Proetida
		To see the Devonian Period Part 1 : Lichida, Corynexochida, Proetida and Harpetida
	tyra-rex.com /trilobite/DevB/td2.html (257 words)

	Palaeontographica A
		Proetida (3), Phacopida (2), Lichida (Lichoidea, Odontopleuroidea) und ergänzende Daten.
		Proetida (3), Phacopida (2), Lichida (Lichoidea, Odontopleuroidea) and and additional data].
		keywords: trilobites, Devonian; Devonian, trilobites; Rhenohercynian; Phacopida; Lichida; Lichoidea; Odontopleuroidea;
	www.schweizerbart.de /j/palaeontographica/pal-a/palA-250-S.html (691 words)

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