Arcticoceras

Arcticoceras
Temporal range: Bathonian[1]
↓
Arcticoceras cranocephaloides fossils at the Geological Museum in Copenhagen
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Ammonitida
Superfamily:
Stephanoceratoidea
Family:
Cardioceratidae
Subfamily:
Arctocephalitinae[2]
Genus:
Arcticoceras

Spath, 1924

Arcticoceras is an extinct ammonoid cephalopod genus from the late Middle Jurassic belonging to the ammonite family Cardioceratidae, more commonly found to high northern latitudes.

The Arcticoceras shell is involute, inner whorls sharply ribbed, outer ones becoming smooth.[3] The suture, following the description of the Stephanoceratoidea, is complex, ammonitic, with a dominant 1st lateral lobe and well-developed umbilical lobe. May be derived from Arctocephalites.

Arcticoceras is found in northern Alaska, arctic Canada, Greenland, northern and central Russia, as well as in Wyoming, North Dakota, and Utah.[3] Part of the fauna that lived in high latitude (arctic and subarctic) marine waters during the second half of the Middle Jurassic.

Arcticoceras kochi and A ishmanae have been found in the boreal Bathonian stage of central East Greenland. Arcticoceras and Arctocephalites are found the Volga River Basin, Sartov Region, and Arctocephalites in the Pechora River Basin indicating an earlier and deeper penetration of arctic water into European Russia than previously thought.[4]

References

  1. ^ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. ^ "Paleobiology Database - Arcticoceras". Retrieved 2017-10-19.
  3. ^ a b Arkell et al,1957, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Mollusca 4, R.C. Moore, ed. p.L301 -L303
  4. ^ Meledina, S. V.; Nal'Nyaeva, T. I.; Shurygin, B. N. (2009). "Correlation of upper Bajocian-Bathonian zones in Siberia with the stage standard". Stratigraphy and Geological Correlation. 17 (3): 291–297. Bibcode:2009SGC....17..291M. doi:10.1134/S0869593809030058.


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