Repenomamus

Repenomamus is an extinct genus of gobiconodontid mammals from Early Cretaceous China. Its largest species rank among the biggest mammals known from the Mesozoic.

Repenomamus robustus: A species of Repenomamus known from Early Cretaceous fossils in northeastern China. This smaller species is associated with a fossil preserving a mammal eating a juvenile dinosaur.
Gobiconodontidae: An extinct family of mostly carnivorous or insectivorous mammals known from the Mesozoic. Repenomamus is classified within this family.
Predation: An interaction in which one organism captures and consumes another. The preserved prey remains indicate that Repenomamus sometimes consumed vertebrates.
Dinosaur–mammal interactions: Ecological relationships between dinosaurs and mammals living at the same time. The fossil of prey inside Repenomamus documents a direct feeding interaction.
Repenomamus giganticus: A large species of Repenomamus described from Early Cretaceous deposits in China. Its estimated size makes it one of the largest known Mesozoic mammals.
Mammalia: The group of vertebrates distinguished by features including hair and milk production. Repenomamus belongs to Mammalia, though it is outside the crown group of living mammals.
Fossil stomach contents: Preserved remains of food found within an extinct animal’s body cavity. They provide direct evidence that Repenomamus robustus ate a juvenile dinosaur.
Mesozoic mammal body size: The range and evolutionary limits of body sizes among Mesozoic mammals. Repenomamus demonstrated that some Mesozoic mammals grew much larger than previously recognized.
Jehol Biota: A diverse assemblage of Early Cretaceous fossils from northeastern China. Repenomamus fossils belong to this exceptionally well-preserved ecosystem.
Eutriconodonta: An extinct group of mammals characterized by distinctive multi-cusped molars. Repenomamus is commonly placed among eutriconodont mammals.

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