Dr. Dan Killam on Nostr: I used to think clams were united by living in a two-valved external shell. That's ...

I used to think clams were united by living in a two-valved external shell. That's before I learned about naked clams. Clamydoconcha orcutti has an internal shell! Its mantle has extended to completely surround the shell, which is now effectively an endoskeleton. These little clams are often found in intertidal areas and are quite nimble, hopping around with an agile foot #clamFacts