Poecilosclerida)

We report the first records of the new species Isodictya filiformis (Demospongiae, Poecilosclerida, Isodictyidae) from the Peter I Island, Low Island and Deception Island (Antarctic), between 97 and 210 m in depth. We add dataset about the species identified by Burton, in 1934 as Isodictya delicata var. megachela, from Seymour Island (Antarctic).