†Sornayceras Matsumoto 1965

Matsumoto 1965. A monograph of the Collignoniceratidae from Hokkaido Part II. (Studies of the Cretaceous ammonites from Hokkaido and Saghalien-XV). Memoirs of the Faculty of Science Kyushu University Ser D Geol, 16(3) 1965: 209-243