Phascolosomatidea

Phascolosomatidea is a subclass of the class Sipuncula, the peanut worms, containing two orders:-

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

Their hooks are arranged in regular rings.

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