Australiceras

Australiceras is an extinct ammonite genus from the upper part of the Early Cretaceous, Aptian stage, included in the family Ancyloceratidae.

Australiceras
Temporal range: Aptian[1]
Australiceras species
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
โ€ Ammonitida
Family:
โ€ Ancyloceratidae
Genus:
Australiceras

Whitehouse
Species [2]
  • A. gracile
  • A. hirtzi
  • A. irregulare
  • A. jacki
  • A. lampros
  • A. robustum
  • A. transiente

Description

Australiceras has an evolute shell, coiled with all whorls showing in keeping with its inclusion in the Ancyloceratida. The inner, early, whorls bear ribs that alternate between those that are smooth and those the bear stout blunt or conical tubercles. Ribs on the outer whorls become free of tubercles and end up all smooth.

Australiceras bears some resemblance to Tropaeum and Balearites, both related genera.

The type species is Australiceras jacki.

References
Notes
  1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. Paleobiology Database - Australiceras. 2014-05-29.
Bibliography
  • W. J. Arkell et al. 1957. Mesozoic Ammonoidea, Treatise on Invewrtebrate Paleontology, Part L. Geological Society of America, R.C.Moore, (ed)
  • F. W. Whitehouse. 1926. "The Cretaceous Ammonoidea of Eastern Australia", Memoirs of the Queensland Museum 8(3):195-242.


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