Domatoceras parallelum

Domatoceras parallelum (Abich, 1878) Nautilus parallelus Abich, 1878: 17, pl. 2 fig. 2. Remarks “ Nautilus parallelus, nov. form.” was described and illustrated by Abich (1878: 17, pl. 2 fig. 2). This illustration shows a fragment of less than half a volution of a specimen with a conch diameter of about 120 mm. Only the last whorl is preserved and this appears to be deformed or corroded on one side. Therefore, the conch shape cannot be precisely described. However, it can be seen that the umbilicus is rather wide (uw/dm ~0.45) and that the flanks are almost parallel. Specimens with this morphology have not been collected from NW Iran.