Priapulimorphida is the sole order within the Priapulimorpha, one of the three extant

Priapulid Priapulida (priapulid worms, from Gr. πριάπος, ''priāpos'' 'Priapus' + Lat. ''-ul-'', diminutive), sometimes referred to as penis worms, is a phylum of unsegmented marine worms. The name of the phylum relates to the Greek god of fertility ...

classes.

References

Priapulida Ecdysozoa orders Extant Pennsylvanian first appearances {{Protostome-stub