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Introduction to the Echiura

https://ucmp.berkeley.edu/annelida/echiura.html

“until recently, and they are still considered close relatives of the annelids. The body of an echiuran lacks annelid-type segmentation, but the distinctive free-swimming trochophore larval stages of echiurans and polychaetes are very similar. Both echiurans and annelids are classified together...” (from the page’s text)

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