the many Chordata, and the few extinct species belonging to the Vetulicolia.

Etymology

Ambulacraria, from the latin ambulacrum, meaning "a walk planted with trees", was named by Élie Metchnikoff in reference to the larval similarities including a folded band lined with cillia that are used for both feeding and locomotion. Metchnikoff also noted similarities among the coelomic systems of echinoderms and hemichordates

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