Two new bathyal species of Pseudotachidius (Copepoda: Harpacticoida) from the Beaufort Sea (Alaska,U.S.A.)

Summary

Two new species of harpacticoid copepods are described from the northeastern coast of Alaska, U.S.A. Pseudotachidius brevisetosus sp. nov. and Pseudotachidius bipartitus sp. nov. co-occurred at depths from 659–1144 m. Pseudotachidius brevisetosus is unique in the armature of the ♀ P₅ and the ♂ P₂ endopod. Pseudotachidius bipartitus, with a 2-segmented P₁ endoped is also unique. The setal arrangements of Pseudotachidius coronatus T. Scott and Pseudotachidius similis T. Scott are discussed. The correct setal formulae for all species and a key to the genus are given.