Lithacoceras is an extinct ammonite cephalopod genus included in the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Jurassic period, from the Oxfordian age to the Tithonian age.
Distribution Fossils of species within this genus have been found in the Jurassic sediments of Antarctica, Argentina, Canada, Cuba, France, Germany, Madagascar, Somalia, Spain, United States and Yemen.Paleobiology Database - Lithacoceras. 2017-10-19.
References
Wojciech Brochwicz-Lewiński Middle Oxfordian representatives of the genera Lithacoceras Hyatt, 1900, and Liosphinctes Buckman, 1925, from the Polish Jura Chain