Diagnosis. Thick-bodied, small neomenioids with solid epidermal spicules in the form of spines, barbed spicules, and serrated spicules; skeletal spicules lacking; cuticle thick or thin; with two pairs of pharyngeal salivary glands, one of them acinar; radular teeth with several denticles on a bar incompletely attached to radular membrane, outer denticles fused to a curved process swung from beneath tooth base; dorsal midgut coecum paired; midgut sacculate; copulatory spicules 2 or more per pair; paired seminal receptacles and accessory copulatory glands present; gametopore single; respiratory folds low, few; dorsoterminal sense organ absent.