This genus is one of the most striking and distinctive among dinosaurs due to its unusual combination of characteristics

a diferencia de otros dinosaurios terópodos

un cuerno nasal más pequeño y dos protuberancias adicionales en la región de las mejillas

being a freshwater aquatic predator with sharp teeth and a body prepared both to swim and to make use of its fin structures to hold on to the bottom of shallow watercourses or in soft ground near the riverbank

Desmostylus hesperus Ichthyosaurus This genus is one ofDesmostylus hesperus was a semi aquatic marine mammal from the Miocene belonging to Desmostylia, an extinct order of mammals known exclusively from the North Pacific. Unlike sirenians, pinnipeds or cetaceans, desmostylians represented a distinct evolutionary lineage that has completely disappeared. They have traditionally been associated with Tethytheria, the broader evolutionary group that includes sirenians and proboscideans. The generic name means