Tetragonoceras is an extinct prehistoric nautiloid genus from the nautilid family Tetragonoceratidae that lived during the Middle Devonian, found in Canada...

The siphuncle is near the ventral margin. Nassauoceras differs from Tetragonoceras in that the latter is gyroconic with a subquadrate whorl section and...

†Taxyceras †Teichertia †Teichertoceras †Temnocheilus †Temperoceras †Tetragonoceras †Tetrameroceras †Tetranodoceras †Tetrapleuroceras †Thaymastoceras †Therioceras...

contains three genera (as of 1964), all confined to the Middle Devonian: Tetragonoceras, Nassauoceras, and Wellsoceras. Bernhard Kummel, 1964. Nautiloidea -Nautilida...