English Sphaerorthoceratidae Cited by user Cephal-odd on 14 Oct 2009 Sphaeorthoceratidae is an extinct family of orthocone cephalopods that lived in the Paleozoic Era.
English Bactritida Cited by user Cephal-odd on 14 Oct 2009 The Bactritida form a small order of more or less straight-shelled (orthoconic) cephalopods that first appeared during the Emsian stage of the Devonian period (390…
English Bactroceras Cited by user Cephal-odd on 14 Oct 2009 Bactroceras was named by Holm (1898). Its type is Bactroceras avus. It was assigned to the Baltoceratidae by Furnish and Glenister(1964) and retained there by Evans (2005…