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Topic: Discosorida


  
  Palaeos Metazoa: Mollusca: Cyrtosoma: Cephalopoda: Discosorida
Cyrtochoanitic cyrtoceracones, the siphuncles broadly expanded from an earlier stage, in contrast to the oncoceroids which are primitively suborthochoanitic in early stages.
Discosorida shell forms vary generally within relatively narrow limits, being mostly breviconic cyrtocones, either endogastrically or exogastrically curved, with only a few deviations from this model, such as the faintly torticonic Endoplectoceras.
The Discosorida formed a very distinctive and well-defined characters, but there no clear evolutionary trends are discernible in their history.
www.palaeos.com /Invertebrates/Molluscs/Cyrtosoma/Cephalopoda/Discosorida.html   (645 words)

  
 Discosorida   (Site not responding. Last check: 2007-10-17)
The class Discosorida is a class that is mostly filled by nautiloids.
The marine animals in Discosorida are mainly soft shelled and rise and fall in the water by pumping gas into seperate chambers in their shell.
They have the ability to go without food for up to a month and their cousins, the octopus are now their enimies after a long period of evolution.
www.homestayfinder.com /Dictionary.aspx?q=Discosorida   (140 words)

  
 Septa (biology) - Biocrawler   (Site not responding. Last check: 2007-10-17)
In some nautiloids, such as the Orthoceratidae, the septa tend to be widely spaced, resulting in large, long camarae.
In others such as the Ellesmerocerida, Oncocerida and Discosorida the septa are crowded closely together.
In some straight-shelled forms like Actinoceras, calcium carbonate deposits extend from the camera (mural deposits) to the septa (episeptal deposits).
www.biocrawler.com /encyclopedia/Septa_%28biology%29   (235 words)

  
 Palaeos Metazoa: References
Ascocerida, Barrandeocerina, Discosorida, Ellesmerocerida, Nautilida, Oncocerida, Orthocerida, Plectronocerida, Tarphycerida, Tarphycerina.
Actinocerida, Ascocerida, Barrandeocerina, Discosorida, Ellesmerocerida, Endocerida, Nautilida, Oncocerida, Orthocerida, Pseudorthocerida, Tarphycerina.
Actinocerida, Ascocerida, Barrandeocerina, Discosorida, Ellesmerocerida, Nautilida, Plectronocerida, Tarphycerina.
www.palaeos.com /Invertebrates/Lists/References.html   (3267 words)

  
 Cincinnatian Fossils ----- Generic Index
Clarkesvillia Flower, 1946 -----> Mollusca, Cephalopoda, Nautiloidea, Discosorida
Faberoceras Flower, 1946 -----> Mollusca, Cephalopoda, Nautiloidea, Discosorida
Westonoceras Foerste, 1924 -----> Mollusca: Cephalopoda: Nautiloidea: Discosorida
inside.msj.edu /academics/faculty/davisr/cintian/alphtaxa.htm   (1056 words)

  
 The Ultimate Septa (biology) - American History Information Guide and Reference
In some nautiloids, such as the Orthoceratidae, the septa tend to be widely spaced, resulting in large long camarae.
In others such as the Ellesmerocerida, Oncocerida and Discosorida the septa are crowded closely together.
In some straight-shelled forms like Actinoceras, calcium carbonate deposits extend from the camera (mural deposits) to the septa (episeptal deposits).
www.historymania.com /american_history/Septa_%28biology%29   (212 words)

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