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The organisms in phylum Chaetognatha are known as arrow-worms, or bristle-jaws. They have a very interesting anatomy and eating habits. Their phylogeny is tricky and still in flux, so let's learn about what we know right now!
Script by Ryan Helcoski and Dr. Carsten H G Müller: www.researchgate.net/profile/...
Additional collaboration by Dr. Yvan Perez: www.researchgate.net/profile/...
Handbook of Zoology: www.degruyter.com/database/zo...
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