![]() Marine biologist Sónia Cruz at the University of Aveiro in Portugal works with two other Elysia species but hasn’t seen anything like it. Just which Elysia species can turn into crawling heads isn’t clear yet. “We were really surprised to see the head crawling,” Yusa says. ![]() Mitoh first noticed the sea slugs’ extreme regeneration by chance in some Elysia slugs in the lab. And vertebrate regenerators, like salamanders regrowing a tail left in the jaws of a predator, don’t regrow a whole body from a severed head. Yet their body plan is simpler, and they don’t have hearts.Ī group of tubelike sea squirts called ascidians might be considered the most complex of whole-body regenerators. They can regenerate the whole body from multiple cut pieces. In one sense, planarians, the little cross-eyed flatworms that biology students mince up to study regeneration, “are better,” Yusa says. The rest of the body follows suit (day 14, second from right) until regeneration is complete (day 22, far right). ![]() By day 7 (second from left), the heart has begun to regenerate. marginata sea slug gradually grows a whole new body. After disconnecting its head from its body (far left, arrow points to the heart), a process that can take several hours, an Elysia cf.
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