Placenticeras

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Subclass: Ammonoidea (or Superorder)
Order: Ammonitida
Superfamily: Hoplitaceae
Family: Placenticeratidae
Genus: Placenticeras

Medium to large, compressed, involute ammonites (s.s.) with slightly convex sides and a very narrow venter. Smooth or with faint falcoid ribs. Early whorls have umbilical tubercles which later shift to a mid side location. The suture line is fairly straight. Sutures are ammonitic with many auxiliaries.

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