Elthusa parabothi n. sp. (Cymothoidae), parasite on Parabothus kiensis (Teleostei, Bothidae) collected at a depth of 400 m off New Caledonia, is described. The species is characterised by the almost regular circular shape of females, and is very different from the other species of the genus ; it superficially resembles Livoneca circularis but can be distinguished by features of body and appendages. Three species of Aegidae were collected from deep-sea (300-900 m) sharks caught off New Caledonia: Aega angustata Whitelegge, 1901, collected from Hexanchus nakamurai, Squalus megalops and Squalus melanurus, and Aega cf. deshaysiana (Milne Edwards, 1840) and Aega webbii (Guérin, 1836), both collected from Squalus megalops. Their morphological characteristics are described. These are new records for New Caledonia and for these sharks.
Crustacea, Isopoda, Elthusa parabothi n. sp., Aega, Bothidae, selacians, New Caledonia, new records, new species.