This mysterious prehistoric sea creature was a big softie. (via ConversationUS)
presented a major challenge, since no similar animal is known, neither living nor extinct.
responsible for the formation of a skeleton in echinoderms. All living echinoderms carry these genes; we assume that extinct groups did, too., there is a marked difference between the calcification of its rays, or arms, and the lack of it on the rest of its body. It raises the hypothesis that the genes involved in skeleton formation may have acted independently in different parts ofOur studies have allowed us to form some hypotheses about this animal, though many questions remain.
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