Joeropsis semicircularis sp. nov., holotype, male A habitus, dorsal view B pseudorostrum C lateral margin of pleotelson D antennula E antenna F flagellar articles of antenna except for setation G left mandible H right mandible I maxillula J maxilla K maxilliped L detail of maxillipedal palp. Scale bars: 0.5 mm (A); 0.2 mm (C–K); 0.1 mm (L); 0.05 mm (B).