''Arcticoceras'' is an extinct

ammonoid Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

cephalopod genus from the late

Middle Jurassic The Middle Jurassic is the second epoch of the Jurassic Period. It lasted from about 174.1 to 163.5 million years ago. Fossils of land-dwelling animals, such as dinosaurs, from the Middle Jurassic are relatively rare, but geological formations co ...

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.Arkell et al,1957, Mesozoic Ammonoidea,

Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...

, Part L, Mollusca 4, R.C. Moore, ed. p.L301 -L303 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 ''Arctocephalites'' is an extinct ammonitic cephalopod genus from the Middle Jurassic with a wide northern distribution belonging to the stephanoceratacean family, Cardioceratidae.Arkell et at, 1957, Mesozoic Ammonoidea , Treatise on Invertebra ...

''. ''Arcticoceras'' is found in

northern Alaska Arctic Alaska or Far North Alaska is a region of the U.S. state of Alaska generally referring to the northern areas on or close to the Arctic Ocean. It commonly includes North Slope Borough, Northwest Arctic Borough, Nome Census Area, and is ...

arctic Canada Northern Canada, colloquially the North or the Territories, is the vast northernmost region of Canada variously defined by geography and politics. Politically, the term refers to the three territories of Canada: Yukon, Northwest Territories and ...

, Greenland, northern and central Russia, as well as in Wyoming, North Dakota, and Utah. 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.

References

Jurassic ammonites Fossils of Greenland {{Ammonite-stub