Deuterostomia | Chordates, Echinoderms, Hemichordates
https://www.britannica.com/animal/Deuterostomia
WEBDeuterostomia, (Greek: “second mouth”), group of animals—including those of the phyla Echinodermata (e.g., starfish, sea urchins), Chordata (e.g., sea squirts, lancelets, and vertebrates), Chaetognatha (e.g., arrowworms), and Brachiopoda (e.g., lamp shells)—classified together on the basis of embryological development and by molecular ...
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