Tapirusosaurus

Tapirusosaurus is an extinct species of quadrupedal dinosaur that belonged to the prosauropod/Plateosauria family. It was also among the last ever prosauropod so far in existence, living in North America in the Late Jurassic period (155-145 million years ago), and it survived competition from sauropods by becoming semi-aquatic, much like tapirs, which fill a similar niche to this dinosaur, hence the dinosaur's name. It is also named after its skull was discovered, which had a large nasal hole, so paleontologists suggested that this dinosaur had a short trunk like a tapir. It was also protected by small but heavily armored for protection against predators like Allosaurus and others. Despite its defense, this dinosaur became extinct for some unknown reason.