Phascolosomatidea
Phascolosoma turnerae
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Annelida
Class:	Sipuncula
Subclass:	Phascolosomatidea
Orders
Aspidosiphonida Phascolosomatida

Phascolosomatidea is a subclass of the classSipuncula, thepeanut worms,^[1] containing two orders:-^[2]

• Aspidosiphonida containing the single familyAspidosiphonidae
• Phascolosomatida containing the single familyPhascolosomatidae

Their hooks are arranged in regular rings.^[3]

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