Phascolosomatidea is a subclass of the class Sipuncula, the peanut worms,[1] containing two orders:-[2]
Their hooks are arranged in regular rings.[3]
Phascolosomatidea is a subclass of the class Sipuncula, the peanut worms, containing two orders:-
Aspidosiphonida containing the single family Aspidosiphonidae Phascolosomatida containing the single family PhascolosomatidaeTheir hooks are arranged in regular rings.