How did trilobites move?

Answer 1

Hmmm...Good Question.

Well obviously, they became more adapted to there environment...This is more easily looked at Herbivores.

The first Herbivorous Dinosaurs were small Prosauropods, which looks more like the coelophysoids or herrerasaurids that the later, thundering sauropods of the Jurassic and Cretaceous.

They soon got bigger, and by the close of the Triassic, the first large,bodied Dinosaurs evolved. These include the large Prosauropods Riojasaurus and Plateosaurus, and the first true sauropods also evolved in this time. Ornithschians also evolved. These include small, fast animals like the later Dryosaurus and Hypsilophodon, and the Late-Cretaceous giant Hadrosaurids like Lambeosaurus, which may have grew to lengths of over 15M and 10 Tonnes, larger than some sauropods.

By the Middle-Jurassic, the first really huge Dinosaurs appeared. Barapasaurus was 18M long, small compared to later giants such as the 28M long Diplodocus, or the badly known 60M giant Amphecolias, but was still the largest creature in its Environment.

The Late Jurassic was the heyday of the Sauropods and Ornithschian Stegosaurs. These include well-known species, such the 13M high, 40 Tonne Brachiosaurus, or the 9M long, 2 Tonne, Stegosaur Stegosaurus.

By the Early Cretaceous, Sauropods went Into decline. New, more advanced Herbivores took over from the massive sauropods and stegosaurs. These include the well-known Iguanadon and Camptosaurus, and the bizarre Ouranosaurus from Africa, as well as the much smaller Laellynasaura and kin. The reason for there success was a simple chewing motion, and hundreds of compact teeth. This meant they could digest more nutrition than the barrell-chested Sauropods. But, in the Southern Hemisphere, Sauropods still ruled.

In the Middle-Cretaceous, the simple chewing mothion became more advanced, and early Ceratopsian Ornitschians evolved. These include Psittacosaurus, a small, fleet footed dinosaur, a far cry from the massive Triceratops of the late Cretaceous.

The Late Cretaceous was the heyday of the Ornithshians. Giant, 9M long, 5 Tonne Triceratops roamed the plains of North America, along with 15M long Lambeosaurus, a Hadrosaur. The Hadrosaurs were the descendants of animals like Iguanadon, who took chewing to the extreme. Over 460 tightly packed teeth filled the cheeks of this 10 Tonne Giant. Also, heavily-armoured Ankylosaurs lived in the Late Cretaceous, such as Ankylosaurus and Euoplocephalus, whose eyelids were even armoured. These were the last of the giant Herbivorous Dinosaurs, all of which went extinct 65 Million years ago with the rest of the Dinosaurs.

Damn, I can't write all that down for carnivores!! Maybe another day...

Hope that answered most of your question...lol.

Answer 2

Trilobites are extinct early arthropods. They evolved from the arthropod-like Precambrian groups like Spriggina and are now classified in modern times as being closely related to horseshoe crabs.

Answer 3

Trilobites became extinct at the end of the Permian period during the Permian extinction. It was among the vast amount of land and aquatic animals that disappeared during this period.

Answer 4

Many walked on the ocean floor with their segmented legs. Others swam in the water above the sea floor.