Researchers have identified a previously unknown species of early mammal relative from the Jurassic Period, designated Megacauda sungei, which provides significant evidence of anatomical developments crucial to mammalian evolution. The fossil, discovered in Inner Mongolia and now housed at the Paleontological Museum of Liaoning in Shenyang, was analyzed by paleontologists from institutions in China, the United States, and Germany.
The specimen’s most notable feature is evidence of a sophisticated soft palate that separated the mouth from the pharynx. This anatomical structure enabled mammals to swallow while maintaining the ability to breathe—an essential capability for nursing young. According to paleontologist Thomas Martin from the University of Bonn, this adaptation directly supported the development of effective nursing in mammals, which in turn provided survival advantages that enabled subsequent brain development in the lineage eventually leading to humans. Without this capacity, mammals would have faced challenges similar to crocodiles, which must lift their heads and use jerking motions to move food down their throats.
Megacauda sungei measured approximately half a meter in length and weighed about two kilograms, making it unusually large compared to other early mammal relatives of its time. The creature possessed adaptations for aquatic life, including a broad, flattened tail and specialized teeth with backward-curving cusps suited for gripping slippery prey. Computed tomography scans revealed that the animal likely propelled itself through water by paddling with its front legs while undulating its tail, with hind legs assisting in directional changes.
The species belongs to the docodonts, an extinct group of mammaliaforms that flourished during the Jurassic Period. Other docodont fossils indicate the group developed remarkable ecological diversity, with members adapting to tree-dwelling, burrowing, and aquatic lifestyles. This evidence demonstrates that early mammal relatives were already experimenting with specialized body forms and survival strategies millions of years before modern mammals became dominant on Earth.
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