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Promachoteuthis sloani is known from two specimens: the smaller holotype, an immature female 58 mm ML and a paratype, an immature female, 102 mm ML. The paratype was captured by the R/V WALTER HERWIG in 1973 while the holotype was captured by the R/V G.O. SARS in 2004 and was in near-perfect condition. Both were taken from the North Atlantic in nets that fished to depths greater than 2,000 m. Virtually nothing is known of their biology.
A Promachoteuthis ...
- without nuchal fusion between head and mantle.
- with mostly 3-4 series of suckers on arms.
- with papillae on tentacles.