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Assemblage of Barremian heteromorph ammonites from southeastern France. Ancyloceratida varied widely in size, ranging from diminutive Ptychoceras, which was barely 3 cm (1.2 in) long, to Baculites and Diplomoceras, which could grow to 1–2 m (3.3–6.6 ft) in length.
They are known as heteromorph shaped, with a partly uncoiled shell and the aperture directed toward the coiled part. Most ammonites are homomorph, as they maintain the same shape throughout the growth, while the ammonites in this genus have uncoiled shells ( heteromorph or different-shaped ammonites), that would have precluded fast swimming.
Heteroceras is a genus of Lower Cretaceous heteromorph ammonites belonging to the ancyloceratoidean family, Heteroceratidae. [1] Description
The name "ammonite", ... Heteromorph ammonite Didymoceras stevensoni Life restoration of the heteromorph ammonite Diplomoceras with the plesiosaur Aristonectes Life ...
Polyptychoceras is a heteromorph ammonite, meaning that its shell does not curl up into the tight spiral shape which shells of ammonites from the subclass Ammonoidea typically do. Polyptychoceras shells have an abrupt weight increase after formation of the initial shaft, which represents the shell's automatic balance condition. [4]
Ancyloceratidae is a family of heteromorphic ammonites that lived during the Early Cretaceous.Their shells begin as a loose spiral with whorls not touching which then turns into a straight shaft that ends in a J-shape hook or bend at end.
A rare heteromorph ammonite fossil from the south of France. The species is Crioceratites nolani and the spines have been partially restored to show how it might have appeared in life. Crioceratites is an ammonite genus from the Early Cretaceous belonging to the Ancyloceratoidea.
Nostoceratidae is a diverse family of heteromorph ammonites found throughout the oceans of the world during the Late Cretaceous. The nostoceratids are famous for the bizarre coiling of their shells. The nostoceratids are famous for the bizarre coiling of their shells.