Actually, my big concern is that they just aren’t considered. They certainly do share a large number of morphological elements when you connect the various echinoderms together.
Not that that’s the ONLY way, but when you add in the fact that we’ve got two rows of distinct spines on top and nothing that resembles ‘two rows of legs’ it should point at least somewhat in the direction of pentaradial symmetry, true? I’m thinking the creature’s design has already been framed.
Not that I don’t love my velvet worms, or any of the other theories, but this is the first one that FELT right to me.
