Cephalopoda

Apsidoceratidae Hyatt, 1884

Selection of related publications
Frye, M. W. 1982. Upper Ordovician (Harjuan) nautiloid cephalopods from the Boda Limestone of Sweden. Journal of Paleontology 56, 5, 1274-1295.
Stumbur, H. 1955. Eesti NSV ülem-ordoviitsiumi nautiloididest. Diplomitöö; 16 fototahvlit, materjali nimekiri Stumburi tööde kaustas, pp. 1-159.
Balashov, Z. G. 1953. Svernutye i polusvernutye nautiloidei ordovika Pribaltiki. Trudy Vsesoûznogo Naučno-Issledovatel'skogo Geologo-Razvedočnogo Instituta (VNIGRI) , 217-300. Stratigraphy and fauna of the Ordovician and Silurian West Russian Platform, pp. 217-300.
Strand, T. 1933. The Upper Ordovician Cephalopods of the Oslo Area. Norsk Geologisk Tidsskrift 14, 1-143.
Öpik, A. 1933. Uus kivistis Saaremõisa lademest. Eesti Loodus , 4, 94-94.