''Valhalloceras'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

nautiloid Nautiloids are a group of cephalopods (Mollusca) which originated in the Late Cambrian and are represented today by the living ''Nautilus'' and ''Allonautilus''. Fossil nautiloids are diverse and species rich, with over 2,500 recorded species. Th ...

cephalopods found only in upper Lower Ordovician, Arenigian,

carbonates A carbonate is a salt of carbonic acid, (), characterized by the presence of the carbonate ion, a polyatomic ion with the formula . The word "carbonate" may also refer to a carbonate ester, an organic compound containing the carbonate group . ...

on Svalbard Island and

Jan Mayen Island Jan Mayen () is a Norwegian volcanic island in the Arctic Ocean with no permanent population. It is long (southwest-northeast) and in area, partly covered by glaciers (an area of around the Beerenberg volcano). It has two parts: larger no ...

. The type and only species so far named is ''Valhalloceras floweri'' Evans and King 1990. ''Valhalloceras'' is assigned to the

Oncocerida The Oncocerida comprise a diverse group of generally small nautiloid cephalopods known from the Middle Ordovician to the Mississippian (early Carboniferous; one possible member is known from the Early Permian), in which the connecting rings are t ...

, it and the related genus '' Phthanoncoceras'' are united in the family Phthanoncoceratidae.

References

''Valhalloceras floweri''
in Fossilworks, 16 Oct 2014 *Jack Sepkoski, 2000
List of cephalopod genera
Prehistoric nautiloid genera Ordovician cephalopods of Europe Fossils of Svalbard {{Paleo-nautiloid-stub