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ORTHOCONIC CEPHALOPOD [1 record]

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Alphabetical list of terms

Record 1 2006-11-15

English

Subject field(s)
  • Paleontology
CONT

Most Silurian cephalopods had straight shells, called orthocones which were separated inside by walls which formed chambers within the shell. They were free-swimming, carrying their shells in a horizontal position. They moved at great speeds by taking in water and squirting it out, jet-propelling themselves along. Orthoceras was a Silurian orthocone cephalopod which was probably the ancestor to all other cephalopods.

CONT

Orthoceracone cephalopods and crinoid orientations were studied in middle Silurian Waukeshaw beds in a quarry 1/2 mi. N. of Lemont, Illinois, and between the Sanitary and Ship Canal and the Des Plaines River.

OBS

The orthocones derive their name from their essentially straight shell; some from the Ordovician and Silurian reached lengths of 3 meters.

OBS

orthocone cephalopod: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Paléontologie
CONT

Les céphalopodes orthoconiques de l'Ordovicien de la Formation Katkoyeh à Banestan, Province de Kerman, Iran, comprennent une seule espèce [...]

OBS

L'ancêtre des Céphalopodes est le Monoplacophore. L'évolution s'est faite dans le sens où la coquille s'est refermée et les cloisons sont apparues. À l'origine, il existe trois types de coquille : droites (orthocône), arquées (cystocône) ou enroulées (nautilocône, origine des Nautiloïdes).

OBS

orthocône: Qualifie la coquille allongée de certains gastéropodes.

OBS

céphalopode orthocéracône : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Key term(s)
  • céphalopode orthocéraconique

Spanish

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