Molpadiidae

Müller, 1850

3 Genera, 1 monotypic; 57 species

Tentacles with lateral digits, or claw shaped. Tentacle ampullae long (reduced in one deep water species). Spicules derived from triradiate tables with solid three-pillared spire. Tail with tables with round to oblong disc, or long fusiform rods. Dark red egg shaped phosphatic bodies often present. (Pawson, 1970)

Tentacles claw shaped or with terminal digits and a few small lateral digits. Tentacle ampullae long or reduced. Spicules derived from triradiate tables with three-pillared spire. Tail with tables with round to oblong disc or long fusiform rods. Phosphatic deposits often present. (Pawson, 1977)