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About: Aspidoceratinae     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatJurassicAmmonites, within Data Space : dbpedia.org associated with source document(s)

Type: yago:Ammonite109195958yago:Fossil109284589yago:Object100002684yago:PhysicalEntity100001930yago:Remains109407346yago:WikicatJurassicAmmonites New Facet based on Instances of this Class

The Aspidoceratinae is a subfamily in the perisphictacean ammonite family, Aspidoceratidae found world wide in middle and upper Jurassic sediments. Aspidoceratinae differ from Peltoceratinae in that the early biplicate ribbed stage is lacking, or greatly reduced, and no forms with lappets are known. Aptycus are bivalved and very durable, and in the "lower Kimmeridgian form Aptychus beds, containing few or no ammonites". (Kimmeridgian is middle Upper Jurassic, follows the Oxfordian and predates the Tithonian).