Suecoceras is an endoceratid (a kind of nautiloid cephalopod) that lived during the Middle Ordovician. It is characterised by a long, straight, slender shell with a slightly expanded tip that curves slightly downwards. The shell is compressed from side to side in the humped apical portion, but circular in the rest. The siphuncle is proportionally large, 1/3 to 1/2 the shell diameter; ventral at the beginning, becoming subventral in the adult portion. Septal necks are holochoanitic to slightly maxichaonitic, extending back to the previous septum and sometimes beyond. Endocones are long and slender, with a narrow tube running down the middle. The siphuncle takes up the entire apex, but is not swollen as in Chazyoceras or Nanno. A typical species, S. barrande (Dewitz), whose failure remains are known from Sweden (hence the name, Sueco- means "Scandinavian"), has a shell about long. Distribution Fossils of the genius have been found in: Karmberg Formation, Tasmania, Australia Kandle Formation, Estonia Vaidlenai Formation, Lithuania Segerstad and Seby Limestones, Sweden Rochdale Formation, New York state References Further reading Teichert, C. 1964. Endoceratoidea; Treatise on Invertebrate Paleontology, Part K, Geological Society of America and Univ. Kansas Press Moore, Raymond C., Lalicker, Cecil G., & Fischer, Alfred G. 1952. Invertebrate Fossils. McGraw-Hill, New York. Page 355 R. Ruedemann. 1906. Cephalopoda of the Beekmantown and Chazy formations of the Champlain Basin. Bulletin of the New York State Museum, Paleontology 14:389-611 Nautiloids Ordovician cephalopods Tremadocian Floian Dapingian Darriwilian Ordovician Australia Fossils of Australia Paleontology in Tasmania Ordovician cephalopods of Europe Paleozoic Estonia Fossils of Estonia Paleozoic Lithuania Fossils of Lithuania Ordovician Sweden Ordovician cephalopods of North America Ordovician geology of New York (state) Paleontology in New York (state) Fossil taxa described in 1896