''Gleviceras'' is an
ammonite
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...
genus (order
Ammonitida
Ammonitida, or true ammonites, are an order of Ammonoidea, ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures.
Ammonitida is divided into four suborders, the Phylloceratina ...
) that lived during the Early
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...
Period, found in Canada, Hungary, Mexico and the United Kingdom.
''Glevumites'' Buckman 1924, ''Guibaliceras'' Buckman 1918, ''Riparioceras'' Schindewolf 1962, ''Tutchericeras'' Buckman 1919, and ''Victoriceras'' Buckman 1918 are considered synonyms.
Description
''Gleviceras'' produced laterally compressed involute shells with a small umbilicus, close spaced sinuous ribbing, and a sharp keel along venter. The suture is ammonitic with deep narrow complex lobes. It is similar to ''Oxynoticeras'' except for being less narrow and having a more rounded venter. ''Fastigiceras'' differs primarily in having an occluded umbilicus.
Taxonomy
''Gleviceras'' was described by Buckman in 1918 and is included in the Family
Oxynoticeratidae
Oxynoticeratidae is a family of true ammonites (order Ammonitida) included in the superfamily Psiloceratoidea.
Oxynoticeratids have a broad, worldwide distribution but a narrow stratigraphic one, being known only from the Upper Sinemurian and L ...
and superfamily
Psiloceratoidea
Psiloceratoidea is a superfamily of Early Jurassic Ammonoidea, ammonoid cephalopods proposed by Alpheus Hyatt, Hyatt in 1867, assigned to the order Ammonitida. They were very successful during Hettangian and Sinemurian. Last of them, family Cym ...
.
Species include:
* ''Gleviceras doris''
Reynes, 1879
* ''Gleviceras guibalianum''
D'orbigny, 1844
* ''Gleviceras iridescens''
Tutcher and Trueman, 1925
* ''Gleviceras lotharingius''
Reynes, 1879
* ''Gleviceras palomense''
Erben, 1956
''Gleviceras'' is closely related to the genera ''
Cheltonia'', ''
Hypoxynoticeras'', ''
Oxynoticeras'', ''
Paracymbites'', ''
Paroxynoticeras'', ''
Radstockiceras'' and ''
Slatterites''.
References
* W.J. Arkell ''et al.'', 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Geological Society of America and University of Kansas Press. (L240 -243)
* Joachim Blau. et al. A new fossiliferous site of Lower Liassic (Upper Sinemurian) marine sediments from the southern Sierra Madre Oriental (Puebla, Mexico): ''
Revista Mexicana de Ciencias Geológicas
The ''Revista Mexicana de Ciencias Geológicas'' is a triannual peer-reviewed open-access scientific journal published by the National Autonomous University of Mexico, Sociedad Geológica Mexicana, Instituto Nacional de Geoquímica, and Socieda ...
, v. 25, núm. 3, 2008, p. 402-407'
Oxynoticeratidae
Ammonitida genera
Jurassic ammonites
Ammonites of Europe
{{Ammonitina-stub