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Peracarida
Diplodocus
built for grabbing prey and breaking bone
The coelacanth has no real commercial value apart from being coveted by museums and private collectors
Didelphodon, skull Posters PeracaridaDidelphodon (meaning "two womb tooth") is a genus of stagodont metatherians (extinct carnivorous mammalian clade that includes all mammals more closely related to marsupials than to placentals) from the Late Cretaceous of North America. Although perhaps little larger than a Virginia opossum, with a maximum skull length of 12. 21 centimeters (4. 81 inches) and a weight of 5 kilograms (11 pounds), Didelphodon was a large mammal for Mesozoic standards.