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jahump

What the heck is this?

It came as a hitchhiker on live rock. If I prod it, it moves and the visible hole closes. It is not part of the rock. pic1 is from what appears to be behind, pic2 is from top side.

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Some sort of bivalve. Harmless filterfeeder

 

Nice sponges BTW. Are they hitchhikers or did you buy them?

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+1

Sounds like a burrowing clam.

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Ordered the package from Tampa Bay Saltwater and the sponge in was included. I would recommend TBS as they included some amazing animals and have always been very quick in responding to questions.

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