Arthropoda includes pentastomids

 

Cuticle molted

Ecdysozoa

1

1

3

Annelida includes pogonophorans, echiurans, and sipunculans

2 Arthropoda includes pentastomids

3 Chaetognatha is discussed with deuterostomes

The blastula stage occurs in the development

Diploblasts

Triploblastic Bilateria

Spiral cleavage

Radial cleavage

Mouth formed from the blastopore

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