The main difference between Boletzkya and Naefiteuthis is the length of the phragmocone at which time the living chamber becomes gladius - like and dominates the shell .
They are the Boletzkyidae based on the genus Boletzkya and the Naefiteuthidae based on the genus Naefiteuthis .
The main difference between Boletzkya and Naefiteuthis is the length of the phragmocone at which time the living chamber becomes gladius - like and dominates the shell .
They are the Boletzkyidae based on the genus Boletzkya and the Naefiteuthidae based on the genus Naefiteuthis .