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Two Bodies of One Worm

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PavelRiha
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Description

Polychaets, as well as many other invertebrates, exist in two largely independent body forms (larval and adult). Image shows a polychaete annelid from the family Sabellariidae in two different developmental stages. Trochophora larva has only two active HOX-genes, the adult worm has seven.
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Comments1
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Rodlox
the larva looks like it could take over the jellyfish niches if the opportunity arises.  (hmm...)

an excellent illustration; kudos