Ehrenberg, 1838
Hypotrichs with flexible or rigid body and usually 18 frontoventral-transverse (FVT) cirri clustered to 6 distinct groups. FVT cirri originate from six longitudinal primordia segregating 1, 3, 3, 3, 4, 4 cirri. Six or less parental FVT cirri participate in primordia formation. At least one fragmenting dorsal kinety.
Planctonic species recorded:
Actinotricha saltans
Trachelostyla pediculiformis