''Rineceras'' is an extinct genus from the
nautilid family
Trigonoceratidae
The Trigonoceratidae is a family of coiled nautiloid cephalopods that lived during the period from the Early Carboniferous ( Mississippian) to the Early Permian.
Diagnosis
Trigonoceratidae comprise members of the order Nautilida characterized ...
which is part of the
Trigonocerataceae
The Trigonoceratoidea are a superfamily within the Nautilida that ranged from the Devonian to the Triassic, thought to have contained the source for the Nautilaceae in which ''Nautilus'' is found.
Trigonoceratoidea are characterized by open-spir ...
, that lived during the
Mississippian Period in the late Paleozoic.
''Rineceras'' is described in the
Treatise
A treatise is a formal and systematic written discourse on some subject, generally longer and treating it in greater depth than an essay, and more concerned with investigating or exposing the principles of the subject and its conclusions."Treat ...
, in Kummel, 1964, as being evolute with volutions in contact but not deeply impressed at maturity and the whorl section elliptical and depressed; the conch (shell) bearing prominent longitudinal ridges, which may be spinose. ''Rinceras'' is illustrated, fig. 311-4 p. K429, as a closely coiled gyrocone of about two volutions, whorls not in contact. Longitudinal ridges (ribs) are shown. The illustration is designated as ''R. propinquum'' (DeKoninck), the type.
''Rineceras'' is similar to ''
Pararineceras'', ''
Thrincoceras'', ''
Discitoceras
''Discitoceras'' is an extinct genus of nautiloids from the Lower Carboniferous
Lower may refer to:
*Lower (surname)
*Lower Township, New Jersey
*Lower Receiver (firearms)
*Lower Wick
Lower Wick is a small hamlet located in the county of Glo ...
'', and ''
Chouteauoceras
''Chouteauoceras'' is an openly coiled, gyroconic, nautiloid cephalopod from the Mississippian of North America belonging to the Nautilid family Trigonoceratidae, and superfamily Trigonocerataceae
The Trigonoceratoidea are a superfamily with ...
'' in that all are covered by numerous longitudinal ridges.
''Rineceras'' was named by Hyatt in 1893. It is based on ''Gyroceras propinquum'' DeKoninck, 1880, found in the Lower Carboniferous of Belgium.
References
* Kummel, B, 1964; Nautiloidea- Nautilida; Treatise on Invertebrate Paleontology Part K Nautiloidea; Geological Society of America and University of Kansas Press.
{{Taxonbar, from=Q16989283
Nautiloids