The Phallus Worms (Priapulida) - phylum
(Halicryptomorpha)
(Halicryptomorphida)

(Halicryptidae)
- family
(Priapulimorpha)

(Priapulidae)
- family

(Tubiluchidae)
- family
(Seticoronaria)
(Seticoronarida)

(Maccabeidae)
- family