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Promachoteuthis sulcus (first known as Promachoteuthis sp. C on this page) 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.