Lobendoceras is a proterocameraceratid with a rather large, moderately expanded, straight shell with a large marginal siphuncle in which sutures have a broad, deep, ventral lobe and septal necks are subholochoanitic to holochoanitic. Lobendoceras has been found in Lower Ordovician marine strata in NW Australia and Siberia. See also List of nautiloids References Curt Teichert, 1964. Endoceratoidea. Treatise on Invertebrate Paleontology, Part K. Geol Soc. of America and Univ of Kansas press. Teichert and Moore (eds) Teichert and Glenister 1954 . Early Ordovician cephalopod fauna from northwestern Australia. Bulletins of American Paleontology 35 (150): 7–112. Prehistoric nautiloid genera Fossils of Russia Nautiloids Ordovician cephalopods Prehistoric invertebrates of Australia