 Bitaunioceras

Bitaunioceras is a genus of Permian orthocerids with a gradually expanding, straight, orthoconic shell with straight transverse sutures and a small, subcentral siphuncle with straight tubular orthochoamitic necks.The shell surface of "Bitaunioceras" has a few, shallow, rounded constrictions and numerous, unequal, prominent transverse wire-like lirae.