Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Cephalopoda
Subclassis: † Ammonoidea
Ordo: † Ammonitida
Subordo: † Ancyloceratina
Superfamilia: † Turrilitoidea
Familia: † Nostoceratidae
Genus: † Nostoceras
Subgenus: N. (Nostoceras)
Name
Nostoceras Hyatt, 1894
References
Kennedy, W. J., Landman, N. H., Cobban, W. A., & Johnson, R. O., (2000). "Additions to the Ammonite Fauna of the Upper Cretaceous Navesink Formation of New Jersey" American Museum Novitates 3306(1):1–30
Nostoceras is an extinct genus of ammonites. The etymology of the name Nostoceras comes from the Greek words "nostos" meaning return and "ceros" meaning horn, named as such by Alpheus Hyatt because it bends back on itself.
Taxonomy
Nostoceras is the type genus for the ammonite family Nostoceratidae which is included in the Turrilitoidea. The Turrilitoidea, with Nostoceras and the Nostoceratidae, are commonly included in the suborder Ancyloceratina but may instead belong in the Turrilitina, a proposed order of heteromorphs thought to have a separate derivation, though this separation does not have wide support.
Fossil record
Fossils of Nostoceras are found in marine strata from the Campanian stage of the Upper Cretaceous, in the USA, England, central Europe, west Africa, Australia and Madagascar (Angola, Australia, Austria, Belgium, Denmark, England, France, Germany, Iraq, Italy, Madagascar, the Netherlands, Nigeria, Oman, Spain, United States).[2]
Description
Nostoceras is typified by a tightly coiled helical spire on a large U shaped body chamber with the aperture, in mature individuals, nearly touching and lying underneath the spire. The initial helical whorls are covered with fine ribs and may have small spines. The U shaped body chamber has coarser ribbing and large tubercles. Periodic constrictions may be present on the phragmocone. Species may coil either to the left or to the right. Nostoceras is like Bostrychoceras in general form, except that its ribs may be flared and the constrictions may or may not be present.
Sources
Notes
Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Archived from the original on 2016-02-25. Retrieved 2014-05-28.
"Paleobiology Database - Pectinatites". Retrieved 17 December 2021.
Bibliography
Arkell et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L. Geol Soc. of Amer. and Univ. Kans. press.
Larson, Neal L. 2012. The Late Campanian (Upper Cretaceous) Cephalopod Fauna of the Coon Creek Formation at the Type Locality. The Journal of Paleontological Sciences: JPS.H.2012.01. [1]
A Pictorial Guide to Fossils by Gerard Ramon Case
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