Kosmoceras

Kosmoceras is a moderately evolute ammonite genus from the upper Callovian (Middle Jurassic) of Europe with a simple aperture 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 Temporal range:
Kosmoceras pronaie
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	†Ammonoidea
Order:	†Ammonitida
Family:	†Kosmoceratidae
Genus:	†Kosmoceras Waagen, 1869
Synonyms
Ammonitus Waagen, 1869

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

• 
  Kosmoceras cromptoni
• 
  Kosmoceras jason
• 
  Kosmoceras medea
• 
  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
• "Ammonitida – Ammonitid ammonites". Mikko's Phylogeny Archive. Archived from the original on August 13, 2022.
• "Cephalopoda". Sepkoski Online Results. Archived from the original on October 24, 2023.
• Philippe C. Courville, Catherine Crônier. Diversity or disparity in the Jurassic (Upper Callovian) genus Kosmoceras (Ammonitina): a morphometric approach