Page "Chaetognatha" Paragraph 13
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Lynn Margulis and K. V. Schwartz place chaetognaths in the deuterostomes in their Five Kingdom classification.
The similarities between chaetognaths and nematodes mentioned above may support the protostome thesis-in fact, chaetognaths are sometimes regarded as a basal ecdysozoan or lophotrochozoan.
Chaetognatha appears close to the base of the protostome tree in most studies of their molecular phylogeny.
If chaetognaths branched off from the protostomes before they evolved their distinctive protostome embryonic characters, they may have retained deuterostome characters inherited from early bilaterian ancestors.
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