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About: Discoceras     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:Mollusk, within Data Space : dbpedia.org associated with source document(s)

Type: yago:WikicatOrdovicianAnimalsyago:Animal100015388yago:LivingThing100004258yago:Object100002684yago:Organism100004475yago:PhysicalEntity100001930yago:Whole100003553yago:WikicatExtinctAnimalsOfIndiayago:WikicatPrehistoricAnimalsOfAsiayago:WikicatPrehistoricAnimalsOfEuropeyago:WikicatPrehistoricAnimalsOfNorthAmericaumbel-rc:Mollusk New Facet based on Instances of this Class

Discoceras is an extinct marine cephalopod mollusk, a member of the Trocholitidae in the Tarphycerida. It is distinct from Discosorus, It is characterized by closely coiled, gradually expanding shells with a subquadrate cross section, that may be ribbed or smooth. The sides are broadly rounded; the venter is wide and slightly rounded. The maximum width is slightly dorsal of the middle. The dorsum has a slight to moderate impression. The siphuncle starts off central for the first half whorl then becomes in the succeeding two whorls, then at maturity. As with Trocholites, the dorsal siphuncle in Discoceras probably indicates an orientation during life that places the back of the living chamber high in the shell.