Found in a tide pool in the Seattle area. Clearly some kind of filter feeder. Maybe 7" long, 2-3" in diameter. Is it a clam? Can I determine what kind?

Posted Jun 2, 2021, 3:27 AM UTC
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Posted Jun 2, 2021, 3:27 AM UTC
It's the siphons of a piddock, which is a type of bivalve. Most likely a Rough Piddock.
Yep, you nailed it. Perfect, thanks so much.
Piddocks are really interesting little creatures!
Tunicate.
Fun fact: Young tunicates have a similar anatomy to vertebrates, and they are grouped into chordates.
Cool, thanks!
Very interesting.