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Topic: Nautilida

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Chambered Nautilus

Nautiloidea

Cephalopoda

Cephalopod

Sepiida

Sepiolida

Teuthida

Coleoidea

Spirulida

Octopoda

Argonauta

Mollusk

Vampyromorphida

Chiroteuthidae

Mastigoteuthidae

	Nautilida - Wikipedia, the free encyclopedia
		Today the group is represented only by the six species of the genera Nautilus and Allonautilus.
		In 1942 Otto Schindewolf proposed that the Nautilida evolved from straight-shelled ("Orthoceras") nautiloids, which gradually developed a curved shell through transitional forms like the Ordovician Lituites.
		It is now widely agreed that they evolved from Oncocerids.
	en.wikipedia.org /wiki/Nautilida (629 words)

	Palaeos Metazoa: Mollusca: Cyrtosoma: Nautiloidea: Nautilida
		The Nautilida exhibit an infinite variety in degrees of coiling (with no deviations from the planispiral model), whorl cross sections, and surface ornamentations, but no overall trends in any of these features.
		Although the ancestors of the Nautilida have previously been considered among straight-shelled ("Orthoceras") cephalopods which became gradually coiled nautilids (Schindewolt; 1942), or from coiled Silurian forms of the Barrandeocerine Tarphycerids (Barrandeoceratidae Flower and Kummel 1950 or Lechritrochoceratidae Dzik 1984, it is now generally accepted that the Oncocerida gave rise to the order Nautilida.
		Teichert 1988 suggests that the best candidates would be the Acleistoceratidae and the Brevicoceratidae, both of whom have exogastrically curved or coiled shells and cyrtochoanitic septal necks, characteristic of early rutoceratids and ptenoceratids nautilida.
	www.palaeos.com /Invertebrates/Molluscs/Cyrtosoma/Nautiloidea/Nautilida.html (737 words)

	Nautilida (Fossil Nautiloidea Page) (Site not responding. Last check: 2007-10-13)
		However, later in the "Osnovy" and "Treatise" (and from that date on) the order or superorder Nautilida was accepted almost unequivocally.
		(Tainocerataceae and Trigonocerataceae derived directly or indirectly from Oncocerida; origin of Clydonautilaceae and Aipocerataceae uncertain, Nautilidae stem from Syringonautilidae.) Comment: This is simply not a diagnosis for a monophyletic grouping; reduced to the mentioned characters it says: curved to coiled conchs.
		It represents three grade-groups of the Nautilida: the Rutocerina (perhaps monophyletic, looking from the Silurian/Devonian boundary upward in time; according to my data and opinion restricted to the Devonian), the Lirocerina (monophyletic (?) from a Carboniferous point of view; stratigraphic range: Carboniferous to the Triassic), and the "Post-Triassic" Nautilina (monophyletic?; Jurassic to Recent).
	userpage.fu-berlin.de /~palaeont/fossilnautiloidea/fossnautnautilida.htm (615 words)

	Amazon.com: Nautilida (Site not responding. Last check: 2007-10-13)
		Ammonoidea chambered nautilus Nautilida Mississippian Oncoceroida Devonian Actinoceroida Silurian...
		TAXONOMY 171 Sepioida Octopoida Tertiary Nautilida Belemnoida Cret.
		Hercoglossa ulrichi (White, 1882) (Cephalopoda: Nautilida) from the Cannonball Formation (Paleocene)...
	www.amazon.com /s?ie=UTF8&keywords=Nautilida&tag=tabularasa0f&index=blended&link_code=qs&page=1 (784 words)

	CiteULike: Shell microstructure and morphogenesis of the ornamentation in Cymatoceras Hyatt, 1883, Cretaceous ... (Site not responding. Last check: 2007-10-13)
		CiteULike: Shell microstructure and morphogenesis of the ornamentation in Cymatoceras Hyatt, 1883, Cretaceous Nautilida.
		Shell microstructure and morphogenesis of the ornamentation in Cymatoceras Hyatt, 1883, Cretaceous Nautilida.
		CiteULike will not help you view an online article which you aren't authorized to view.
	www.citeulike.org /article/608802 (124 words)

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