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)