New museum find shows nature can’t stop inventing seahorses

Australian museums have been quietly harboring a secret for nearly two decades: a fish that looks exactly like a seahorse but isn't one. The specimen, now named Australyichthys aegis and nicknamed the helmethead sea muppet, was caught by accident in a deep-sea dredge off southern Australia back in two thousand six, but ended up misidentified in the invertebrate collection at the South Australian Museum. Researchers recently CT-scanned its skeleton and found something the fish's appearance had hidden—bones that tell a completely different story from a true seahorse. Per the Conversation, DNA confirmed it belongs to its own genus, along with two relatives equally mistaken for seahorses. This is convergent evolution in action: different fish lineages arriving at the same seahorse-like body plan independently. The genus is known from only seven specimens caught over sixty-five years, none collected in nearly two decades, making these deep-reef dwellers a priority for future exploration.

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