I know you're not talking about the ray, but they are vertebrates and aren't slimy. In fact they've got really coarse skin, and some are even spiky.
I thought they were more cartilaginous. They have a gristly spinal column, but not backbone.
@General_Strike started
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I know you're not talking about the ray, but they are vertebrates and aren't slimy. In fact they've got really coarse skin, and some are even spiky.