Variazioni sul tema II: Description of Carcinocaris Dussarti sp. nov. associated with xanthid crabs and new data on the distribution of Carcinocaris serrichelata (Copepoda, Harpaticoida)

A new species of the laophontid genus Carcinocaris, C. dussarti sp. nov. is described. The specimens were collected from the carapax of xanthid decapod crabs gathered in the intertidal zone along the coast of Samed Island, Thailand. This is the third species for the genus; it is most similar to C. serrichelata, from which it can be distinguished by the maxillipedal claw of both sexes with three strong teeth, the caudal rami with seven setae, the two-segmented P4 exopodite of the males, the rectangular P5 exopodite of females, and the reduced P6 setation of the females. The differences from C. minipedia are represented by the ornamentation of the body surface and maxillipedal claw, the armature of the caudal rami, the structure and armature of P2 of both sexes, the segmentation of the P4 exopodite of the females, and the male P5 with a single seta. Notes on additional records of C. serrichelata, previously known from the type locality only, are provided.