Bairdoppilata scaura, n. sp. and five species of Bairdoppilata and Paranesidea in open nomenclature are described from
encrusting communities on French Frigate Shoals and Kane’ohe Bay, Oahu, Hawaiian Islands. Some poorly documented
anatomical traits (carapace setae, hingement, antennal claws, genitalia) are examined for their potential taxonomic signif?icance, in order to confirm the coherence of the Genus Bairdoppilata and to explore its diversity.