In other words—bone hats. As we’ve seen, the Ornithischian (bird-hipped) dinosaurs were one of the two main types of dinosaurs (the other being the lizard-hipped Saurischians). The Spinosauridae family was named after Spinosaurus, but not all members of the family have a similar sail. Could Aliens At The Distance Of 65 Million Light Years See Dinosaurs On Earth? This was held up by spine-like bones, from which it got its name (Spinosaurus means ‘spine lizard’). We hope that you have enjoyed learning all about the different types of dinosaur. Click on the photo below to discover this week’s animal! They had beak-like mouth parts. Named after the Tyrannosaurus (which means ‘tyrant lizard’), Tyrannosauridae is a family of bipedal meat-eaters. Different dinosaurs ate different diets. This group of dinosaurs includes the Dromaeosauridae (raptor) family. Even dinosaurs that lived in the same period may have been separated for millions of years. Its name literally means “fear nothing,” and it is thought that the immense size of this herbivore left it with few—if any—predators as an adult. However, there may have been a few ornithischians that were omnivorous or even carnivorous. For example, 57 million (or more) years passed between the disappearance of baryonyx walkeri and the appearance tyrannosaurus rex, yet both species lived during the Cretaceous Period. The word ‘theropod’ comes from the Greek for ‘wild beast foot’. So far, only two species of Velociraptor are discovered, namely V. mongoliensis and V. osmolskae. When learning about dinosaurs, it’s important to remember that they were on Earth for tens of millions of years longer than humans have been. Paradoxically, this coolest of dinosaurs didn’t appear in many movies until Jurassic World. However, their trademark large sickle-shaped claws on their second toes and swift agile hunting still made them formidable predators. However, our entire knowledge of dinosaurs stems from fossilized remains that have been in the ground for an almost unimaginable length of time. For example, most people would talk about the Iguanodon, which is actually a genus, rather than an individual species of Iguanodon. Giant dinosaurs such as Apatosaurus, Diplodocus, and Titanosaurus were all sauropods. The diminutive members of the genus Compsognathus are great for the remarkable sense of scale they provide. Stegosauria was a group of armored dinosaurs that had rows bony of plates running along their backs. Those with bird-like hips he named ‘ornithischians’, which comes from the Greek for ‘bird hip joint’. Many were further protected by spikes and tail clubs. Get in its blind spot, and you get its giant bony club in your face. Dinosaurs came in many different shapes and sizes. Pachycephalosaurians were bipedal and had thick skulls (the name Pachycephalosauria means ‘thick headed lizards’). Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Velociraptor (raptor for short) became a point of interest among the general public after its portrayal in the Jurassic Park movie series. Two well-known groups of Thyreophorans were Stegosauria and Ankylosauria. The smallest types were about the same size as a chicken, and the largest were over 100 feet (30 meters) long. Image by I, Steveoc 86 [CC-BY-SA-3.0] Click on the image to find out more about allosaurus.There are two main types of dinosaur: saurischia and ornithischia.