Nereididae – the proboscis in action

Alitta virens can also use its proboscis to burrow. First it thrusts its head into the sand and then anchors its body with the use of coelomic fluid, muscles and chaete.  Muscle contractions are used to bring the body forward and continued extension/retraction of the proboscis allows the Annelid to  burrow deeper into the sand.

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