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Topic: Trilobitomorpha

	A CLADISTIC ANALYSIS OF TRILOBITOMORPHA TO CHELICERATA AND CRUSTACEA (Site not responding. Last check: 2007-10-13)
		The Chelicerata, Crustacea, and Trilobitomorpha were analyzed cladistically in order to determine whether the Trilobites are more closely related to the Chelicerates or to the Crustaceans.
		The results observed from the phylogram show that the Trilobitomorpha are more closely related to the Crustacea than the Chelicerata, which supports Margulis and Schwartz’s (1998) classification.
		The Trilobites, the Crustaceans, and the Chelicerates are all grouped in the phylum Arthropoda, which are believed to have evolved from annelid ancestors.
	www.susqu.edu /students/b/bradleyl/Trilobites.htm (1521 words)

	Palaeos Invertebrates: Arthropoda: Arachnomorpha
		As such, "Arachnomorpha" or "Arachnata" constitutes a broad taxon that includes the Trilobites, the Chelicerata and a number of primitive Cambrian to Devonian forms that are usually included in the Trilobitomorpha or the Xiphosura.
		Included around the base of the "Crown Group" Chelicerata are a number of primitive forms called "Merostomoidea" - which seem to be transitional between Trilobites and Chelicerates proper.
		"Trilobitomorpha with eurypterid or xiphosurid type of body, trilobation more or less distinct; tergites of trunk free or ankylosed into continuous shield, telson mostly styliform; 1st and last pair of trilobite appendages may be modified and others partly reduced"
	www.palaeos.com /Invertebrates/Arthropods/Arachnomorpha.html (884 words)

	Trilobitomorpha Information
		The Trilobitomorpha is a subphylum of the phylum Arthropoda that includes the trilobites.
		Originally a variety of peculiar forms, mostly from the lower Cambrian, were included as the Class Trilobitoidea.
		View a list of authors or edit this article.
	www.bookrags.com /wiki/Trilobitomorpha (75 words)

	Systematics of the Trilobites and their Allies
		Many other Cambrian arthropods, especially those from the world-famous Burgess Shale, were once considered probable trilobite relatives, or "trilobitomorphs." While many of these problematic arthropods are no longer thought to be related to the true trilobites, recent studies have shown that a number of them are closer to the trilobites than to any other arthropods.
		The term "Trilobitomorpha" is used here in this more restricted sense.
		Exactly how these arthropods are related to the trilobites is not yet perfectly clear, but the non-trilobite "trilobitomorphs" probably compose several clades.
	www.ucmp.berkeley.edu /arthropoda/trilobita/trilobitasy.html (357 words)

	Encyclopedia: Trilobitomorpha (Site not responding. Last check: 2007-10-13)
		Originally a variety of peculiar forms, mostly from the lower Cambrian, were included as the Class Trilobitoidea.
		However, the many speciesâ”known only from fossilsâ”do not appear to be closely related to the trilobites or, in many cases, to each other either, and are now generally placed in separate subphyla when classified at all.
		Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc....
	www.nationmaster.com /encyclopedia/Trilobitomorpha (198 words)

	Trilobite (Site not responding. Last check: 2007-10-13)
		Arthropoda, by far the largest and most diverse animal taxon, includes chelicerates, insects, myriapods, and crustaceans as well as many extinct taxa such as Trilobitomorpha.
		The segmented body primitively bears a pair of jointed appendages on each segment.
		The lenses of trilobite compound eyes are mineral, being composed of calcite, rather than being organic as are those of all other arthropods.
	www.lander.edu /rsfox/310TrilobiteLab.html (2310 words)

	Superclass Trilobitomorpha (Site not responding. Last check: 2007-10-13)
		Superclass Trilobitomorpha is broken into two classes: Trilobita and Trilobitoidea; the latter of which warrants discussion due to its uncertainty.
		Robison (1987) notes that the unusual genera of this class appear to have diverse, if not uncertain phyletic relationships.
		Therefore, the only widely accepted class is the Trilobita, whose character states are nearly identical with those of Superclass Trilobitomorpha.
	www.cox-internet.com /coop/tbites.html (1525 words)

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