Characteristics
- Arms
- Arms IV flattened ventrally with broad lateral margins extending onto head.
- Left arm IV hectocotylized.
- Tentacles
- Tentacles, including clubs, completely retractile into pockets occupying ventral region of head.
- Tentacles, including clubs, completely retractile into pockets occupying ventral region of head.
- Head
- Eye pore inside of ventral eyelid.
- Eye pore inside of ventral eyelid.
- Funnel
- Funnel locking-apparatus short, oval to ear-shaped.
- Funnel locking-apparatus short, oval to ear-shaped.
- Mantle
- Dorsal mantle margin free from head.
- Mantle adductor absent.
- Fins
- Fins narrow (length ca. 4 or more times individual fin width), extend almost full length of mantle.
- Attachment of posterior fin-lobes adjacent.
- Shell
- Shell a cuttlebone.
