''Sosioceras'' is an

Upper Permian The Permian ( ) is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last period of the Paleoz ...

shouchangoceratin pseudohaloritid characterized by a subdiscoidal shell, about 2 cm in diameter, marked by growth lines, as with ''

Neoaganides ''Neoaganides'' is a small, 1–2 cm diameter subdiscoidal to subglobular goniatitid belonging to the family Pseudohaloritidae that lived from the Late Pennsylvanian to the Late Permian Late may refer to: * LATE, an acronym which could st ...

'', and having a mature peristome with a double constriction near the periphery. The suture also closely resembles that of ''Neoaganides''. ''Sosioceras'' is found in the Upper Permian Sosio limestone of Sosio valley, in Sicily, first described by Gemmellaro, 1880, as ''Brancoceras pygmaeum'', thought be a rare element of the Sosio fauna. Miller and Furnish, 1957, redefined it as ''Neoaganides pygmaeum'' (Gemmellero) on the basis of close similarity of size, form, and suture to ''Neoaganides grahamensis''. Based on features of the peristome and recognition of a wrinkle layer, unique in this family, Frest ''et al.'', 1981, renamed the genus ''Sosioceras'', in reference to its location, arguing for its separation. The type and only species is ''Sosioceras pygmaeum'' (Gemmellero, 1880).

References

*Frest, T.J, B.F Glenister and W.M Furnish; 1981. Pennsylvanian-Permian Cheiloceratacean Ammonoid Families Maximitidae and Pseudohaloritidae. Memoir 11, the Paleontological Society; Jour Paleo V 55, May 1981, supplement. *Miller, A.K. and W.M Furnish, 1957. Permian Ammonoids from Southern Arabia. Journal of Paleontology V.31, no. 6, p 1043 _, Nov 1957. Shouchangoceratinae Permian cephalopods Permian animals of Europe Goniatitida genera {{Goniatitida-stub