Promachoteuthis sulcus is a species of promachoteuthid squid.

It is distinguished from related taxa on the basis of several morphological features: Nuchal fusion between the head and mantle, much larger size of arm-suckers compared to club-suckers, greater width of tentacle-base than arm-base, a recessed club-base, and the presence of an aboral tentacle-groove.

[1] Promachoteuthis sulcus is known from a single specimen caught by the German research vessel R/V Walther Herwig in an open net off Tristan da Cunha, southern Atlantic Ocean (36°49′S 12°17′W / 36.817°S 12.283°W / -36.817; -12.283 (Promachoteuthis sulcus (only specimen caught))), at a depth of 1,750–2,000 m (5,740–6,560 ft).

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