Yes! Most larval bivalves have byssus, and adults often do in the Pteriomorphia which is one of the oldest groups of molluscs. You can find direct evidence of byssus in some groups because they literally have a byssal notch or a byssal gape - a gap in the shell where byssus can come out!
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slaygoth ur
i just learned about "sea silk" and byssus yesterday. is there any information on how long ago this ability evolved in molluscs?
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I've learned a lot about bivalves today but I don't feel confident.
It's okay if you're too busy to answer! Thank you either way 💜