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Topic: Belemnoidea


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  Mollusca Belemnoidea - Forces of Nature   (Site not responding. Last check: 2007-09-11)
The mollusca belemnoidea, just like the other members of the mollusca family has to hide and run from their predators and that is why in the evlolution of mollusca, these soft creatures was able to generate a shield for their bodies.
The guard of the mollusca belemnoidea is called phragmocone and pro-ostracum were all internal to the living creature, forming a skeleton which was enclosed entirely by soft muscular tissue.
In the researches done for the mollusca belemnoidea, it was found out that the guard of the mollusca belemnoidea which was found in Europe and Asia, measures fifty to sixty centimetres in length, thus, giving the living animal an estimated length of three meters.
www.forces-of-nature.net /topics/molluscum/Mollusca_Belemnoidea.htm   (798 words)

  
  Fossil Coleoidea - Belemnoidea   (Site not responding. Last check: 2007-09-11)
The Belemnoidea are characterized by the development of typical belemnoid hooks arranged in up to 40 pairs at all ten subequal arms and the development of a closing membrane.
The character "four-layered conotheca" given in Berthold and Engeser (1987) and Engeser (1990) as a further apomorphy of the Belemnoidea was based on a miscomprehension of the early mineralization of the embryonic conch.
The typical belemnoid wall structure (post-embryonic) consists of an inner prismatic, a nacreous layer, an outer prismatic mayer and the rostrum (or rostral layers).
userpage.fu-berlin.de /~palaeont/fossilcoleoidea/belemnoidea.html   (368 words)

  
 Coleoidea
One, the Belemnoidea, had members that were common inhabitants of neritic waters during the Cretaceous but became extinct and the end of this Period.
The Belemnoidea represent the primitive condition with 10 equal arms.
Their sister group, the Belemnoidea, is characterized by the presence of hooks that are derived, perhaps, from muscular papillae, the homologues of trabeculae or cirri that lie lateral to the suckers in living coleoids (e.g.
tolweb.org /tree?group=Coleoidea&contgroup=Cephalopoda   (1563 words)

  
 Cephalopods in Action--Young, Vecchione and Donovan, 1998   (Site not responding. Last check: 2007-09-11)
The sister-group relationship between the Neocoleoidea and the Belemnoidea has been established, but requires further confirmation; 3.
The dates of origin of the Belemnoidea, Neocoleoidea, Sepioidea and fossil teuthoids have been extended to considerably earlier times.
The major unsolved phylogenetic problems in need of immediate attention are the position of the Myopsida, relationships within the Sepioidea, the identification of basal nodes with the Oegopsida, and the relationships of most "fossil teuthoids."
www.mnh.si.edu /cephs/yvd98/yvd98.html   (344 words)

  
 Cephalopod Family Index
It is a very diverse class, with 600 living species and more than 7500 fossil species.
In the evolution of cephalopods, three common fossil groups, the Orthocerida (Orthoceras species), Ammonoidea, and Belemnoidea are particularly interesting.
Although not forming a monophyletic line, they indicate progressive evolutionary steps from slow moving shelled forms to high-speed shell-less forms like present-day squid and octopus.
shells.tricity.wsu.edu /ArcherdShellCollection/Cephalopods.html   (602 words)

  
 Amazon.com: belemnoidea
Ammonoidea ---   Aptychus Belemnoidea -  Tentaculitida - -...
The extinct Belemnoidea also belongs to this group.
Paleotemperature analyses of Meso- zoic Belemnoidea from Australia and New Guinea.
www.amazon.com /s?ie=UTF8&keywords=belemnoidea&index=blended&page=1   (918 words)

  
 [No title]
Diagrams of the arm crown modified from Vecchione, et al., 1999.
One result of this is that cephalopod fisheries typically fluctuate wildly in annual catch rates.'; TEXTNOTE ID=1001 TITLE=Discussion_of_Phylogenetic_Relationships TEXT='Extant coleoids form a monophyletic group, the Neocoleoidea, as evidenced by the uniform presence of suckers.
The diagramatic illustrations on the right show the arm-crown modifications found in the major groups of coleoid cephalopods.
ag.arizona.edu /ENTO/tree/eukaryotes/animals/mollusca/cephalopoda/coleoidea/Coleoidea   (1410 words)

  
 Definition of belemnoidea - Merriam-Webster Online Dictionary
Learn more about "belemnoidea " and related topics at Britannica.com
Find more about "belemnoidea " instantly with Live Search
See a map of "belemnoidea " in the Visual Thesaurus
m-w.com /dictionary/belemnoidea   (41 words)

  
 Cephalopoda
Aside from the ammonoids and nautiloids, all modern cephalopods belong to the Coleoidea, most remarkable for their internalised shell.
This clade includes the Belemnoidea (which retain a well-developped internal shell) and the Neocoleoidea (whose shells are reduced or absent).
Belemnoids are a group of cephalopods superficially similar to squids.
www.unet.univie.ac.at /~a0000265/Spec/Cephalopoda.html   (1274 words)

  
 Belemnites: A Quick Look
However, the coleoids and ammonoids diverged long ago, probably during the Silurian Period, with the ammonoids being the dominant group until their extinction at the end of the Cretaceous.
The Belemnoidea were a large group and currently contain about 2000 described species although it is possible that only half of these are actually valid.
Perhaps somewhat surprisingly, much more information is known about the physiology of the belemnite than the ammonite.
www.tonmo.com /science/public/belemnites.php   (2632 words)

  
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wah-ching-gang.linksopen.com   (929 words)

  
 Belemnoidea - Dictionnaire Français-Anglais WordReference.com
We found no English translation for 'Belemnoidea' in our French to English Dictionary.
Or did you want to translate 'Belemnoidea' from English to French?
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www.wordreference.com /fren/Belemnoidea   (57 words)

  
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online-casino-poker.linksopen.com   (882 words)

  
 Belemniten
Belemniten (Belemnoidea), auch Donnerkeile oder Teufelsfinger, sind eine ausgestorbene Gruppe von Kopffüßern.
Sie ähnelten im Aussehen den heutigen Kalmaren, hatten 10 Fangarme und einen Tintenbeutel, besaßen jedoch keine Saugnäpfe an den Fangarmen, sondern Haken.
Donnerkeile galten schon seit langer Zeit in verschiedenen Kulturen als Heilmittel gegen eine Vielzahl von Krankheiten und wurden als Amulett am Körper getragen oder zermahlen als Medizin verwendet.
www.mistelzweig24.de /contents/de/d617.html   (113 words)

  
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 BELEMNOIDEA Articles
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