Strange sea creatures called ctenophores have a fused nerve net where scientists expected to see synapses. Did they evolve their nervous system separately from other animals?
Ctenophores, or comb jellies, are strange jelly-like animals that ghost through the sea propelled by tiny hairs called cilia. They're an enigmatic bunch, with origins that stretch back approximately 540 million years, and no one is sure exactly when they diverged from the rest of the tree of life.
Nervous system evolutionThe discovery raises questions about how all nervous systems evolved and adds fuel to a long-standing debate about how comb jellies are related to the rest of the animal kingdom. Many scientists thought that the nervous system in animals evolved only once, at some point after sponges broke off from the rest of the animal kingdom, as sponges do not have a nervous system.
Fused neural networksThe discovery raises a whole bevy of new questions, Burkhardt said, from how this fused network develops to how it functions. The same cells that are fused together also make connections to other nerve cells via synapses, and other parts of the ctenophore nervous system use synapses, too. It's not clear, Burkhardt said, why comb jellies use two different methods of communication between their nerve cells.
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