Lytoceras

Lytoceras is an ammonite genus that was extant during most of the Jurassic and Cretaceous periods, and is the type genus for the family Lytoceratidae. These cephalopods were fast-moving nektonic carnivores.

Lytoceras
Temporal range: Sinemurian–Cenomanian[1]
Lytoceras fimbriatum
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Lytoceratida
Family:
Lytoceratidae
Genus:
Lytoceras

Suess, 1865
Species [2]
  • Lytoceras aulaeum Anderson, 1938
  • Lytoceras baconicum Vadasz, 1910
  • Lytoceras batesi Whiteaves, 1884
  • Lytoceras belliseptatiforme Collignon, 1962
  • Lytoceras cornucopia Young and Bird, 1822
  • Lytoceras crenatum Buckman, 1926
  • Lytoceras eudesianum (Orbigny, 1845)
  • Lytoceras fimbriatoides Gemmellaro, 1884
  • Lytoceras fimbriatum Sowerby, 1817
  • Lytoceras fraasi Dacqué, 1910
  • Lytoceras francisci Oppel, 1865
  • Lytoceras fuggeri Geyer, 1893
  • Lytoceras furcicrenatum Buckman, 1928
  • Lytoceras juillieti (Orbigny, 1841)
  • Lytoceras ovimontanum Geyer, 1893
  • Lytoceras polycyclum Neumayr, 1873
  • Lytoceras polyanchomenum (Gemellaro, 1872)
  • Lytoceras praesublineatum Fucini, 1899
  • Lytoceras richei Sayn, 1901
  • Lytoceras saturnale Anderson, 1938
  • Lytoceras sepositum Meneghini, 1875
  • Lytoceras subfimbriatoides Hoedemaeker in Hoedemaeker et al., 2016
  • Lytoceras subfimbriatum (Orbigny, 1841)
  • Lytoceras sutile Oppel, 1868
  • Lytoceras trompianum Hauer, 1861
  • Lytoceras villae Meneghini, 1874

Description

Shells of Lytoceras are evolute, round or quadrate in section, covered with crinkled growth lines or riblets, and may have slight constrictions on internal molds. Some have fine striations, (parallel grooves running longitudinally along the flanks).

Distribution

Fossils of species within this genus have been found in the Jurassic and Cretaceous rocks all over the world, particularly in Western Europe, in Madagascar, South Africa and United States.[2]

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References
  1. Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2008-05-07. Retrieved 2017-10-18.
  2. Paleobiology Database - Lytoceras. 2017-10-19.
  • Systematic descriptions, Mesozoic Ammonoidea, by W.J Arkell, Bernhard Kummel, and C.W. Wright. 1957. Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas press.


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