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A newly described fossil from Inner Mongolia, China, indicates that the throat structures linked to mammal-style suckling and swallowing were already in place in early mammal relatives during the Middle Jurassic, roughly 165 million years ago. The animal, Megacauda, was a docodont mammaliaform, not a modern mammal, and the evidence comes from bones and their arrangement. The feeding behavior and soft-tissue function described in the study are inferences drawn from that anatomy.
What the fossil is and where it came from
Nature Portfolio identifies the animal as Megacauda, a docodont within Mammaliaformes, the group that contains living mammals and their extinct relatives. The reported age is about 168 to 163 million years ago, which places it in the Middle Jurassic. The University of Chicago account rounds this to about 165 million years. The specimen was found in what is now Inner Mongolia, China. (Nature Portfolio press release, 8 October 2026; University of Chicago Biological Sciences Division, 7 October 2026)
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The animal is estimated at roughly 40 to 50 centimeters long and 1 to 2 kilograms. The publisher’s release describes it as the largest known Jurassic mammaliaform; that is the release’s own comparison and should be read as such rather than as a systematic count of every Jurassic specimen.
What the throat anatomy shows
In living mammals, the hyoid bones sit between the mouth and throat region and connect to the esophagus and larynx. The University of Chicago account describes these elements as forming a U-shaped saddle that supports the muscular movements used to swallow chewed food and to suckle as an infant. The Megacauda specimen preserves bony throat structures and the anatomy that supports them. The study interprets their arrangement as evidence of a pharynx that works in the same general way as a mammal’s.
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The central claim is therefore about timing. The feeding apparatus that mammals rely on for suckling and swallowing was present in early relatives of modern mammals by the Middle Jurassic. Nature’s own summary states that the apparatus needed for suckling and swallowing had already evolved by this interval. (Nature, 7 October 2026)
Three limits matter here:
- The fossil does not prove the first evolutionary origin of swallowing. It shows the structures were present in one Middle Jurassic animal.
- No researcher observed suckling. The behavior is inferred from the hyoid arrangement and the surrounding anatomy.
- The specimen’s exact age is not the same as the 174 to 164 million year span of the Middle Jurassic. Nature Portfolio uses that broad interval for the period in which the apparatus had evolved, according to the authors’ interpretation.
How the earlier Jurassic evidence changes the story
The headline framing of “evolved far earlier than thought” needs a correction. A prior Jurassic docodont, Microdocodon gracilis, was reported in 2019 with mammal-like hyoid bones. The University of Chicago account acknowledges that earlier find. Megacauda is therefore best described as new evidence, notable for a more complete preservation and additional throat-supporting anatomy, rather than as the first Jurassic animal with mammal-like hyoids.
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What the new fossil adds is a more complete picture of how that throat arrangement looked in a Middle Jurassic animal. Luo, the senior author and a University of Chicago organismal biologist and anatomist, put the broader implication this way: “Once early mammals had this apparatus, each group could develop specialized teeth and diversify into a tremendous range of food resources.”
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The wide, flattened tail, pelvis, hind limbs, and long outer digits support the researchers’ reconstruction of a semiaquatic animal. Its robust canines and shearing cheek teeth are consistent with cutting and chewing meat.
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The University of Chicago report notes tiny vertebrate bone fragments in the stomach region, which suggest that the animal likely ate small animals. Specific prey, such as salamanders, is an inference and has not been demonstrated from the stomach contents.
The comparison with Castorocauda, another docodont that lived in the water, is useful for ecology. April Neander, a University of Chicago scientific artist and CT imaging expert, said that although both docodonts occupied the same niche in the water, the new fossil is older and more complete. The sources reviewed do not give a dated comparison for Castorocauda, so the claim is one of relative age only.
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How the specimen was studied
The fossil preserves delicate structures beneath the skull and a more complete pelvis than researchers had in many other specimens from this period. The institutional report says the specimen was examined with CT scanning and X-ray fluorescence photography, techniques that allowed the team to inspect structures inside a large fossil slab without breaking it apart.
The study is titled “A Jurassic mammaliaform swimmer and transformation of the mammalian pharynx,” by Li and colleagues, and was published in Nature on 7 October 2026 (DOI 10.1038/s41586-026-11107-0). The journal article itself was not reviewed for this piece, so the study metadata comes from the publisher’s release and the Nature briefing, and the anatomical details come from the University of Chicago account.
For readers following up, the most reliable sources are the Nature news article, the Nature Portfolio press release, and the University of Chicago account.
Figures worth quoting with their qualifiers:
- Age of about 168 to 163 million years ago, as reported by Nature Portfolio in 2026 for Megacauda.
- Length of 40 to 50 centimeters and weight of 1 to 2 kilograms, as reported by the University of Chicago Biological Sciences Division in 2026. These are the estimates in that account, not measured values for every individual.
The sources reviewed do not report a population statistic, a measured evolutionary rate, or a comparative percentage, so none should be inferred.
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