Lophotrochozoa (trochophora larvae; spiral cleavage)

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Ectoprocta (Bryozoa)
Moss animal

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Entoprocta (Kamptozoa)
Goblet worm

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Platyhelminthes - Catenulida
Flatworm

Platyhelminthes - Rhabditophora
Flatworm

Platyhelminthes - Rhabditophora - Neodermata
Parasitic flatworm

Some parasitic flatworms have very complex life cycles
feeding off different hosts during different stages of their life
 

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Chaetognatha