Litoceras

Litoceras is a trocholitid (Tarphycerida) genus that has been found in the Lower and Middle Ordovician of Newfoundland. Whorls in Litoceras have a broadly rounded cross section with its width greater than its height. Litoceras somewhat resembles the tarphyceratid Pionoceras from the same time, except for the siphuncle being dorsal and in the center.

Litoceras Temporal range: Early Ordovician–Middle Ordovician PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Tarphycerida
Family:	Trocholitidae
Genus:	Litoceras Billings, 1865

Species

Species within the genera Litoceras include:[1]

• Litoceras calciferum Billings, 1865[2]
• Litoceras versutum Billings, 1865[3]
• Litoceras whiteavsi Hyatt, 1894[4]

References

1. "Paleobiology Database: Litoceras". Paleodb.org. Retrieved 20 August 2013.
2. "Paleobiology Database: Litoceras calciferum". Paleodb.org. Retrieved 20 August 2013.
3. "Paleobiology Database: Litoceras versutum". Paleodb.org. Retrieved 20 August 2013.
4. "Paleobiology Database: Litoceras whiteavsi". Paleodb.org. Retrieved 20 August 2013.

• Furnish, W.M and Glenister, Brian F (1964); Nautiloidea -Tarphycerida in the Treatise on Invertebrate Paleontology, Part L, Nautiloidea, Geological Society of America and Univ of Kansas press.