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About: Proplacenticeras     Goto   Sponge   NotDistinct   Permalink

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

Type: ThingEukaryoteAnimalMolluscaanimaleukaryotemolluscaspecies New Facet based on Instances of this Class

Proplacenticeras is a discoidal ammonite from the lower part of the Upper Cretaceous and precursor of the overall similar Placenticeras. The shell is compressed, with flat or slightly convex sides and narrow flat venter, with or without slightly conical umbilical tubercles, ventrolateral clavi and crescentic ribs on outer part of sides. Sutures are with fewer auxiliary elements than on latter Placenticeras. Species in sequential order, starting with the oldest, include P. sutherlandbrowni, P. stantoni, P. pseudoplacenta, P. fritschi and P. kaffrarium; sometimes identified as Placenticeras.