First report of the order Mysida (Crustacea) in Antarctic marine ice caves, with description of a new species of Pseudomma and investigations on the taxonomy, morphology and life habits of Mysidetes species

Pseudomma kryotroglodytum sp. nov., holotype adult female BL 26.8 mm (A, B, E, F) and paratype subadult female 21.5 mm (C, D). A right antennula, dorsal B antenna with antennal gland, ventral, setae omitted from antennal scale C eyeplate and carapace expanded on slide, short arrow points to distolateral edge of carapace, detail (D) pore group in pre-cardial position E mandibles with left palpus, caudal aspect F maxillula, caudal. Scales omitted from objects A–C, E, F but not from eyeplate in panel C; pore diameters not to scale in C, D.