The occurrence of the parasitic amphipod Trischizostoma crosnieri Lowry & Stoddart, 1993 (Amphipoda: Amphilochidea: Lysianassida) in a methane seep site in the southeastern Pacific

The genus Trischizostoma Boeck, 1861 is a cosmopolitan group of parasitic and symbiotic aristoidean amphipods whose distribution poorly known, with scarce specimens reported principally from pelagic environments until 3655 m depth. In this note, crosnieri Lowry & Stoddart,1993, species described for the southwest Pacific, recorded first time in southeast Pacific. was known previously only female specimen, Philippines, two additional unpublished records east coast Australia Tasmania. studied herein were obtained at 874 depth, 36 nm to northwest Concepción, Biobío Region, methane seep site. However, relationship between particular habitat still uncertain. has been cited Nazca Salas y Gómez ridges; nevertheless, our finding constitutes record continental margin off Chile, raising four Chilean waters.