Paleontologists examining fossils from Inner Mongolia have identified a previously unknown mammal species that lived approximately 165 million years ago during the middle Jurassic period. The specimen, named Megacauda sungei, was discovered a decade ago at the Paleontological Museum of Liaoning and has now been formally described in the journal Nature. The remarkably well-preserved remains included both fossilized bones and soft tissue impressions, making it an exceptionally rare find among early mammalian fossils.
The animal, roughly the size of a chihuahua, displayed a distinctive combination of physical characteristics. Its rear portion, including the pelvis, hind limbs, and tail, resembled those of a modern platypus, suggesting semi-aquatic behavior suited to foraging in water. However, its head structure differed markedly from a platypus, featuring sharp predatory teeth. Researchers discovered small salamander bones within the fossil cavity, indicating the animal had consumed prey by cutting and shearing with its sharp dentition.
Detailed analysis of the fossil’s internal structures proved particularly revealing. Examination of the hyoid bones in the throat, combined with CT scanning of the skull’s underside, exposed delicate features including the roof of the mouth and specialized bone hooks and ridges. This combination of rarely preserved anatomical elements allowed researchers to reconstruct the animal’s muscular and skeletal machinery with significant confidence.
The reconstruction demonstrated that Megacauda sungei possessed two distinctive mammalian capabilities. First, it was capable of chewing food thoroughly before swallowing, a behavior that distinguishes mammals from other vertebrates that typically bite and gulp. Second, evidence suggests the animal was capable of suckling, the fundamental trait that defines the mammalian class and from which the group derives its name—referring to mammary glands. This fossil represents some of the oldest known evidence of an animal possessing both these key mammalian abilities, extending knowledge of when these evolutionary innovations emerged.
The discovery contributes to understanding how dietary innovations enabled mammalian ancestors to diversify during an era when they remained minor players alongside dominant dinosaurs. Multiple feeding strategies had already evolved among proto-mammalian species, including gliders, swimmers, land-dwellers, tree-dwellers, and diggers—each exploiting distinct ecological niches while sharing the fundamental abilities to chew, swallow, and suckle.
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