a diferencia de otros dinosaurios terópodos

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

se cree que en el caso de Xenoceratops foremostensis

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

Desmostylus hesperus Ichthyosaurus a diferencia de otros dinosauriosDesmostylus 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