My female white Calvus claimed a shell today and lured what I thought was a female black Calvus to it. They started circling each other, then the female ducked into the shell for a few seconds. Once she emerged the male lowered his bottom half to the shell and vibrated. He ducked inside the shell head first at one point, I'm hoping he doesn't eat the eggs. I was just reading today how Calvus should be considered shell- dwellers. Pics coming...
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