Four new species of deep-sea Tanaidacea taken from the Gulf of Guinea as part of the Ghanaian marine environmental monitoring programme in 2012 are described. One of the species, which was classified to the family Anarthruridae, differed substantially from the other members of the family, and was accommodated to the newly erected genus -Olokun n. gen. Each of the three other species belongs to a different family: Parakanthophoreus guineus n. sp. -Akanthophoreidae, Collettea agnesi n. sp. -Colletteidae, and Araphura studens n. sp. -Tanaellidae. A key for genera of Anarthruridae is given.

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