Kosmoceras

''Kosmoceras'' is a moderately evolute ammonite genus from the upper Callovian (Middle Jurassic) of Europe with a simple apterure and irregular ribbing interrupted by an irregular row of lateral tubercles. Strong ventral tubercles are separated by a smooth depression running along the rim.

''Kosmoceras'' belongs to the Stephanoceratoidea and is the type genus for the Family Kosmoceratidae and for the subfamily Kosmoceratinae. ''Kosmoceras spinosum'' Waagen is the type species.

'' Lobokosmoceras'' and '' Gulielmiceras'' have been regarded as subgenera of ''Kosmoceras''. ''Gulielmites'' is a fine-ribbed variety of ''Kosmoceras jason''

Species

This genus includes more than 100 species, including:
* ''K. aculeatum''
* ''K. balticum''
* ''K. cromptoni''
* ''K. bizeti''
* ''K. fibuliferum''
* ''K. geminatum''
* ''K. gemmatum''
* ''K. grossouvrei''
* ''K. interpositum''
* ''K. jason''
* ''K. lithuanicum''
* ''K. medea''
* ''K. obductum''
* ''K. ornatum''
* ''K. phaeinum''
* ''K. proniae''
* ''K. rowlstonese''
* ''K. spinosum''
* ''K. subnodatum''
* ''K. weigelti''

Gallery

File:Kosmoceras cromptoni, Chippenham, England, Late Jurassic - Royal Ontario Museum - DSC09941.JPG, ''Kosmoceras cromptoni''
File: Kosmoceratidae - Kosmoceras jason-001.JPG, ''Kosmoceras jason''
File:Kosmoceratidae - Kosmoceras medea.JPG, ''Kosmoceras medea''
File:Ammoniten Kosmoceras ornatum.jpg, ''Kosmoceras ornatum''

References

* Arkell ''et al.'', 1957. Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geological Soc. of America and Univ. Kansas Press.
* ''Fossils'' (Smithsonian Handbooks) by David Ward

''Kosmoceras''
in the Paleobiology Database
* Mikko's Phylogeny Archiv
Ammonoidea

Sepkoski Online Results
* Philippe C. Courville, Catherine Crônier
Diversity or disparity in the Jurassic (Upper Callovian) genus Kosmoceras (Ammonitina): a morphometric approach

Middle Jurassic ammonites of Europe
Middle Jurassic genus first appearances
Ammonitida genera
Stephanoceratoidea

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