Dana, 1852
Diagnosis
Male 4th pleopod biramous; endopod small, unjointed; exopod 3 or 4-jointed, with strong seta on each of distal 2 segments. Telson quadrangular; apex evenly rounded, transverse, emarginate, or incised; proximal half of lateral margin unarmed, distal half and apex densely armed with small spines.
Species treated:
Mysidium gracile