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–E) and paratype subadult female 21.5 mm (F) A terminal portion of telson, dorsal, details show scales on left disto-mesial spine (B) and barbs on left terminal seta (C) D anterior half of cephalothorax, lateral, arrow points to distolateral edge of carapace E sixth pleomere with tail fan, lateral F example for pores (three to the left) and coat of scales on tergite of first pleomere.