
Promachoteuthis sulcus is known from a single, small (25 mm ML, sex unknown) but distinctive individual from great depths in the south Atlantic Ocean.
Brief diagnosis: A promachoteuthid…
- with nuchal fusion between head and mantle.
- with arm suckers much larger than club suckers.
- with tentacle base wider than arm base.
- with recessed club base and aboral tentacle groove.
Link to The Tree of Life Web Project (ToL)

Looks like my brother! LOL
This is an amazing creature! I’d love to see one of these!