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Topic: Eurypterida

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Xiphosura

	Lab 4 – Ecdysozoa - Arthropoda (Site not responding. Last check: 2007-10-12)
		Xiphosura), the sea scorpions (Eurypterida), the Arachnida (spiders, scorpions, mites, and others), and the sea-spiders (Pycnogonida).
		Eurypterida were marine predators that reached 2 meters in length!
		The Xiphosura, Pycnogonida, and Eurypterida are all marine in distribution, however, the Arachnida are almost entirely terrestrial.
	userwww.sfsu.edu /~efc/classes/biol170/lab/Laboratory4.htm (1259 words)

	Systematics of the Eurypterida
		He recognized two suborders, the Pterygotina with greatly enlarged pincer-like chelicerae and simple walking legs, and the Eurypterina in which the chelicerae are small and the forward legs are usually spiny.
		Unfortunately, there are no published cladistic studies on the Eurypterida, and only a single unpublished thesis attempting to produce a phylogeny of all the taxa.
		It is now believed that the Eurypterida is the sister group to the Arachnida, making the sea scorpions closer relatives of the scorpions and spiders than to horseshoe crabs.
	www.ucmp.berkeley.edu /arthropoda/chelicerata/eurypteridsy.html (312 words)

	Early history and phylogeny of chelicerates
		Chelicerata is monophyletic, diagnosed as above, and is restricted to Lemoneites, Xiphosura, Chasmataspida, Eurypterida and Arachnida.
		Chasmataspids are not xiphosurans and are placed as the sister group of Eurypterida + Arachnida, with which they share the synapomorphy of 12 opisthosomal segments.
		Xiphosura, Eurypterida, Chasmataspida and Scorpiones all possess autapomorphies and thus none is ancestral to any other chelicerate group.
	members.tripod.com /~DrJasonDunlop/cp4.html (367 words)

	Langs Fossils: Learn About Fossils
		Eurypterids belong to the subphylum Chelicerata, of the class Merostomata (Dana 1852), Subclass Eurypterida (Burmeister 1843),Superfamily Eurypteracea (Burmeister 1845), and Superfamily Stylonuracea (Diener 1924).
		Their bodies are divided into three segments: the prosoma, the preabdomen or mesosoma and the postabdomen or metasoma.
		This is the case of many of the exposures of the Silurian dolostones of the Niagara escarpment; but a few localities where the habitat of the eurypterida is preserved in the Bertie waterlime some of the most spectacularly preserved specimens can be found.
	www.langsfossils.com /pages/edu-2.htm (1317 words)

	Sea Scorpions (The Eurypterids)
		The sea scorpions were members of the phylum Arthropoda, the same group that our modern insects, spiders, centipedes, millipedes, crabs, lobsters, crayfish and horseshoe crabs belong to.
		Within the arthropod phylum, sea scorpions are further assigned to the class Merostomata, of which the horseshoe crabs are the only extant (still living) members, and the order Eurypterida.
		The Eurypterids have been commonly called the "sea scorpions" due to their resemblance to our modern, land-living scorpions.
	www.suite101.com /article.cfm/paleontology/82437 (510 words)

	Downtonian (Silurian) Eurypterida from Perton, near Stoke Edith, Herefordshire -- Kjellesvig-Waering 88 (1): 1 -- ...
		Downtonian (Silurian) Eurypterida from Perton, near Stoke Edith, Herefordshire
		"In this review of the Downtonian Eurypterida of Perton, Herefordshire [England], a new genus Salteropterus and a new family Hughmilleriidae are proposed, and the family Pterygotidae accordingly emended.
		Hitherto unknown morphological details of the Perton Eurypterida are described and discussed."
	geolmag.geoscienceworld.org /cgi/content/abstract/88/1/1 (129 words)

	Merostomata - Wikipedia, the free encyclopedia
		The class Merostomata is slowly being abandoned in favour of splitting it into two classes, Xiphosura and Eurypterida.
		This is because Merostomata is thought to be paraphyletic, with the Eurypterida more closely related to the Arachnida, forming the group Cryptopneustida (Boudreaux, 1979).
		Inertia, however, has prevented this change from being incorporated in textbooks, which continue to use the traditional "Merostomata".
	en.wikipedia.org /wiki/Merostomata (160 words)

	Palaeos Metazoa: Arthropoda: Chelicerata: Eurypterida: Eurypterida
		The Eurypterida are an extinct Paleozoic group of chelicerate arthropods of which 200 fossil species are known.
		Eurypterida - cladogram and genus list, by Mikko K. Haaramo
		Dr Simon J. Braddy - research on Eurypterids, and on Paleozoic arthropod trackways as documenting the diversity and palaeoenvironmental distribution of the early terrestrial arthropods.
	www.palaeos.com /Invertebrates/Arthropods/Chelicerata/Eurypterida/Eurypterida.html (1698 words)

	Michael's Biodiversiy Project
		Chelicerates diverged from the trilobites and continued to exist after the extinction of the trilobites.
		The most primitive form of chelicerates was Class Eurypterida or water scorpions.
		These organisms eventually began to colonize and evolve on land, which lead to Class Arachnida, making them the closest known relatives to Class Arachnida.
	www.personal.psu.edu /users/m/d/mdk225/evolution.html (207 words)

	On gill-like structures in the Eurypterida -- Moore 78 (1): 62 -- Geological Magazine
		On gill-like structures in the Eurypterida -- Moore 78 (1): 62 -- Geological Magazine
		A specimen of Slimonia showing the structure and segmental arrangement of the gills is described and in a figure the gills are partly restored.
		Evidence is presented in confirmation of the apparent homology of the six mesosomatic segments in the Xiphosura, Eurypterida, and Scorpionida.
	geolmag.geoscienceworld.org /cgi/content/abstract/78/1/62 (82 words)

	The significance of Palaeozoic arachnids (Site not responding. Last check: 2007-10-12)
		Chelicerata originated from among the Arachnomorpha, though their relationships to other arachnomorph taxa remain uncertain.
		Arachnida are currently recognized as monophyletic, though Scorpiones and Eurypterida may represent sister taxa and a number of arachnid characters, e.g.
		Some of the Gilboa trigonotarbids may, in fact, be early representatives of extant orders.
	members.tripod.com /~DrJasonDunlop/cp3.html (208 words)

	PalaeoecologyA gigantic fossil arthropod trackway : Nature
		A unique, complex trackway has been discovered in Scotland: it was made roughly 330 million years ago by a huge, six-legged water scorpion that was about 1.6 m long and a metre wide.
		To my knowledge, this is not only the largest terrestrial trackway of a walking arthropod to be found so far, but is also the first record of locomotion on land for a species of Hibbertopterus (Eurypterida).
		This evidence of lumbering movement indicates that these giant arthropods, now extinct, could survive out of water at a time when the earliest tetrapods were making their transition to the land.
	www.nature.com /nature/journal/v438/n7068/abs/438576a.html (173 words)

	Arthropoda
		Euchelicerata Weygoldt 1986 = Xiphosura + Eurypterida + Arachnida
		The trilobites and "merostomes" (Xiphosura + Eurypterida) he included within the Arachnida.
		The group is herein considered to include the sub-taxa Trilobitoidea, Arachnomorpha, and Mandibulata, wherein lie the great diversity of familiar spiders, scorpions, crustaceans, myriapods and insects, as well as many of the famously problematic stem group arthropods known only from fossils: the marrellomorphs, Burgessia, and so on.
	www.peripatus.gen.nz /Taxa/Arthropoda/Index.html (4878 words)

	Eurypterid - Wikipedia, the free encyclopedia
		The eurypterids were the largest known arthropods that ever lived (with the possible exception of Anomalocarids).
		They are members of the extinct class Eurypterida (Arachnomorpha, Chelicerata) and predate the earliest fishes.
		Clarke, John M. and Rudolf R. The Eurypterida of New York.
	en.wikipedia.org /wiki/Eurypterid (647 words)

	Horseshoe Crabs Class Merostomata
		Now they are a very small group consisting of only 4 species in 3 genera and one order (or subclass) Xiphosura.
		In the past the class contained a second order (or subclass) known as Eurypterida, these were large aquatic animals that looked more like scorpions than their immediate relatives the horseshoe crabs.
		The have been called Sea Scorpions though they often lived in freshwater or brackish habitats.
	www.earthlife.net /chelicerata/merostomata.html (1046 words)

	A taxonomic review of some late Paleozoic Eurypterida -- Kjellesvig-Waering 33 (2): 251 -- Journal of Paleontology (Site not responding. Last check: 2007-10-12)
		A taxonomic review of some late Paleozoic Eurypterida
		The type species of Mycterops Cope, 1886, (M. ordinatus Cope) is redescribed and refigured inasmuch as as the original description and figures were inaccurate.
		Campylocephalus scouleri (Hibbert), hitherto mainly included in the family Stylonuridae Diener, 1924, is made the type species of a new genus, Hibbertopterus, which is included along with the genus Campylocephalus Eichwald, 1860, in a new family, Hibbertopteridae, and referred to the superfamily Stylonuracea Diener, 1924.
	jpaleontol.geoscienceworld.org /cgi/content/abstract/33/2/251 (166 words)

	Paleontology and Geology Glossary: E
		Euryapsids were a group of marine reptiles (now extinct) that had a single skull opening behind the eye socket, a subgroup of the diapsids.
		Eurypterida (meaning "wide wing") are extinct carnivorous marine arthropods (segmented invertebrates with a chitinous exoskeleton and jointed legs), also called "sea scorpions." These hunters had a scorpion-like stinger which may have contained poison, 3 pairs of jointed legs, 2 clawed arms, and strong jaws.
		Eurypterids include Eurypterus, Onychopterella, Pterygotus, Mixopterus, Slimonia, Palmichnium (an ichnogenus, i.e., known from fossilized trackways), etc. Eurypterids date from the early Paleozoic Era, arising during the Ordovician period, over 400 million years ago.
	www.enchantedlearning.com /subjects/dinosaurs/glossary/indexe.shtml (4966 words)

	Fossil chelicerates and evolution of Chelicerata
		Eurypterids are a diverse group that lived from the Ordovician to the Permian (approximately 450 to 250 million years ago).
		They are characterised by a differentiation of the opisthosoma into pre- and post-abdomen (meso- and metasoma), and the presence of genital appendages [although these are not defining characteristics of Eurypterida - Dunlop, 2002].
		Eurypterids could reach over 2 m in length and therefore represent some of the biggest arthropods ever known.
	palaeo.gly.bris.ac.uk /Palaeofiles/Fossilgroups/Chelicerata/fossils.html (620 words)

	Subphylum Chelicerata (Spiders and their kin)
		The Chelicerata, which I have called a subphylum here for convenience, but which is just as well called a phylum in some texts, is an extremely ancient group of arthropods, including the extinct Eurypterida.
		The first ancestral chelicerates probably evolved about 600 million years ago.
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	www.earthlife.net /chelicerata/chelicerata.html (433 words)

	Eurypterida - French-English Dictionary WordReference.com
		We found no French translation for 'Eurypterida' in our English to French Dictionary.
		Or did you want to translate 'Eurypterida' from French to English?
		Forum discussions with the word(s) 'Eurypterida' in the title:
	www.wordreference.com /enfr/Eurypterida (49 words)

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	car-new-wash-york.linksopen.com (975 words)

	arthopod2
		The prosoma also have up to five pairs of walking legs behind the chelicerae.
		Two orders you should know are the Eurypterida and Xiphosurida
		The eurypterids include small to large-sized merostomes with a scorpion-like exoskeleton (see
	paleo.cortland.edu /tutorial/Arthropods/arthopod2.htm (626 words)

	†Eurypterida
		<==o †Eurypterida Burmeister, 1943 (meriskorpionit; sea scorpions) ?- †Glyptoscorpius perornatus Peach, 1882 ?- †Belinuropsis wigodensis Matthew, 1909 --o †Stylonuroidea Diener, 1924 [Stylonauraceae Diener, 1924]
		mathieui (Pruvost, 1923) [Glaucodes mathieui Pruvost, 1923] `--o †Eurypteroidea Burmeister, 1943 [Eurypteraceae Burmeister, 1943] --o †Eurypteridae Burmeister, 1943
		Kazlev, M. A., 2000: Eurypterida – All about “Sea scorpions”.
	www.fmnh.helsinki.fi /users/haaramo/Metazoa/Protostoma/Arthropoda/Eurypterida/Eurypterida_1.htm (370 words)

	CiteULike: THE EURYPTERID ADELOPHTHALMUS SIEVERTSI (CHELICERATA: EURYPTERIDA) FROM THE LOWER DEVONIAN (EMSIAN) KLERF ... (Site not responding. Last check: 2007-10-12)
		CiteULike: THE EURYPTERID ADELOPHTHALMUS SIEVERTSI (CHELICERATA: EURYPTERIDA) FROM THE LOWER DEVONIAN (EMSIAN) KLERF FORMATION OF WILLWERATH, GERMANY
		THE EURYPTERID ADELOPHTHALMUS SIEVERTSI (CHELICERATA: EURYPTERIDA) FROM THE LOWER DEVONIAN (EMSIAN) KLERF FORMATION OF WILLWERATH, GERMANY
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	www.citeulike.org /article/447918 (68 words)

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