Sars, 1903
Body smooth, spindle-shaped; without distinct demarcation between Pr and Ur. R prominent, fused to Ce. Pr prolonged laterally by well-developed epimeral plates, except for last somite. Female Ur of 4 somites; male Ur of 5 somites; last somite small and more or less cleft posteriorly. CR divergent; its 2 median setae elongate. A1 small. A2 with terminal spines denticulate; Exp 2-3-segmented. Rami of P1-4 3-segmented. P5 lamellar with strong spines. Ovisac simple (from Rose 1933).
Two species of the only pelagic genus in the family (Microsetella), are known from the South Atlantic:
Microsetella norvegica and
Microsetella rosea.