Litoceras
Introduction '''''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.
Species Species within the genera ''Litoceras'' include:* ''Litoceras calciferum'' (Billings, 1865)* ''Litoceras versutum'' (Billings, 1865)* ''Litoceras whiteavsi'' Hyatt, 1894
References *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.