Systematic Paleontology
Order: Tarphycerida, (Nautiloidea, Cephalopoda)
Family: Estonioceratidae
Genus: Estonioceras
Estonioceras is a genus in the Estonioceratidae with whorls in contact but without a dorsal impression. The siphuncle, the tube connecting the chambers, is ventral, sub-marginal; whorl section moderately depressed.
Estonioceras is known from the lower Ordovician, Arnigian of the Balto-Scandinavian region of Europe.
References[]
W.M Furnish and Brian F. Glenister, 1964. Nautiloidea - Tarphycerida. Treatise on Invertebrate Paleontology, Part K, (K357 -K358)