Two new species and one new subspecies of the family Portunidae are described from French Polynesia. Brusinia piriformis n. sp. (Carcininae) is known from a single specimen, unfortunately female ; it is distinguished by the anterolateral borders of the carapace cut in four teeth, the first being smaller than the second. Laleonectes stridens n. sp. (Portuninae) is known from 15 specimens allowing a complete description; it shows close similarities to Laleonectes nipponensis (Sakai, 1938) but can be separated by the first male pleopod stouter and the granulations on the carapace denser and smaller. The new subspecies, Thalamita cerasma rectifrons n. ssp., is similar to Thalamita cerasma Wee & Ng, 1995 ; it is separated by the front straighter, with the lateral lobes less separated from the others lobes and the smaller size of the fourth anterolateral tooth of the carapace. A subspecific name is used as the intraspecific variations of T. cerasma remain unknown, this species being only known from its holotype. A key for the species of the genus Brusinia Stevcic, 1991 is presented.
Crustacea, Decapoda, Brachyura, Portunidae, West Pacific, French Polynesia, new species, new subspecies.