Dyslocosaurus polyonychius

† Dyslocosaurus polyonychius is a diplodocid sauropod dinosaur from the Late Jurassic Morrison Formation of Wyoming, USA. Its name means 'many-clawed difficult lizard,' referencing the unusual morphology of its foot bones. Estimated at 18 m or more in length, it was a high-browsing herbivore feeding on conifers and tree ferns. Known from fragmentary material described in 1992, it represents the diversity of sauropods in the iconic Morrison fauna alongside Diplodocus and Apatosaurus.

Diet & Feeding

Herbivore

Dyslocosaurus polyonychius was a plant-eating dinosaur. Herbivores typically fed on ferns, cycads, conifers, and other vegetation available during their era. Many herbivorous dinosaurs developed specialized teeth and digestive systems for processing tough plant material.

Time Period

Jurassic Late Mesozoic Era

Dyslocosaurus polyonychius lived during the Jurassic Late period of the Mesozoic Era, approximately 161.5 to 145.0 million years ago.

One of the most iconic periods for dinosaurs. Giant sauropods like Brachiosaurus and Diplodocus roamed alongside predators like Allosaurus. Archaeopteryx, the earliest known bird, appeared. The Morrison Formation preserves an extraordinary fossil record from this time.