Abstract
Atlantids are holoplanktonic snails found in epipelagic waters of all oceans mostly tropical and subtropical but some temperate. There are three genera within Atlantidae, which can be identified by a dextrally coiled, laterally flattened, transparent, discoid (Atlanta, Protatlanta) or involute (Oxygyrus) shell. They can be found in samples collected with plankton nets or sediment traps. Of the 23 species recognized worldwide, eight are known in the northeast Pacific. Herein distribution range extensions are reported for the atlantid species Atlanta oligogyra and Protatlanta souleyeti.