Phascolosomatidea

Phascolosomatidea is a class of peanut worms containing two orders: * Aspidosiphoniformes * Phascolosomatiformes Their hooks are arranged in regular rings.

Phascolosomatidea

Phascolosomatidea is a class of peanut worms containing two orders: * Aspidosiphoniformes * Phascolosomatiformes Their hooks are arranged in regular rings.