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Ancyloceratidae

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Kingdom  Animalia
Phylum  Mollusca
Order  Ammonitida
Superfamily  â€ Ancyloceratoidea
Rank  Family
Subclass  Ammonites
Ancyloceratidae
Similar  Ammonites, Ancyloceras, Scaphitidae, Tropaeum, Ancyloceratina

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. Coarse ribbing and spines are common.

Ancyloceratidae is the type family for the Ancyloceratoidea and of the suborder Ancyloceratina. They are found in Lower Cretaceous, Upper Hauterivian to perhaps Lower Albian sediments.

Genera include:

  • Acanthoptychoceras
  • Ancyloceras - type genus
  • Acrioceras
  • Aspinoceras
  • Epancyloceras
  • Hoheneggericeras
  • Lytocrioceras
  • Megacrioceras
  • Pseudocrioceras
  • Rugacrioceras
  • Uhligia
  • Ancyloceratidae are derived from the Crioceratidae, a family of Lower Cretaceous ammonites with loosely wound, open planispiral shells, probably originating from within the suborder Lytoceratina.

    References

    Ancyloceratidae Wikipedia


    Similar Topics
    Ancyloceras
    Ancyloceratina
    Scaphitidae
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