It was around 1 metre (3.3 ft) in length, with webbed feet, a streamlined body, and a long tail that may have supported a fin. It probably propelled itself through the water with its long hind legs and flexible tail.

Mesosaurus, (genus Mesosaurus), early aquatic relative of reptiles, found as fossils from the Early Permian Period (299 million to 271 million years ago) in South Africa and South America. Mesosaurus lived in freshwater lakes and ponds. Elongated and slim, it measured about 1 …

Dec 10, 2023 · Measuring around three feet in length, Mesosaurus was a relatively small yet significant animal that adapted to life both in and out of water. Despite its size, typically weighing between 10 to 20 pounds, Mesosaurus had distinct physical features that reveal a …

Dec 31, 2023 · Mesosaurus was relatively small in size. Compared to other aquatic reptiles of its time, Mesosaurus was relatively small, reaching lengths of about 1.5 meters (5 feet).

Dec 25, 2024 · Mesosaurs have long been considered to be small to mid-sized aquatic to semiaquatic amniotes that lived in Gondwana during the Early Permian or Late Carboniferous, according to recent research that showed their ghost range extending back to the Pennsylvanian.

Aug 19, 2019 · Name: Mesosaurus (Greek for "middle lizard"); pronounced MAY-so-SORE-us Habitat: Swamps of Africa and South America Historical Period: Early Permian (300 million …

Jan 3, 2025 · Paleontologists in Uruguay have discovered large, poorly preserved and incomplete skulls, as well as several associated bones, of ancient aquatic reptiles called mesosaurs. These new specimens suggest the existence of gigantism in mature mesosaurs reaching more than twice the size of previously described adults and type specimens.

It was around 1 metre (3.3 ft) in length, with webbed feet, a streamlined body, and a long tail that may have supported a fin. It probably propelled itself through the water with its long hind legs and flexible tail.

Size: (25.4 mm = 1 inch): Mesosaurus fossil is 600 mm long overall from tip of snout to tip of tail along backbone, Skull: 53 mm long by 15 mm wide, Forelimb: 66 mm total length, Hind Limb 103 mm long (if straight), Matrix: 370 mm by 330 mm

Mesosaurus was approximately 3 feet long and weighed around 20 pounds. That made it the size of a yardstick and about the weight of a Dachshund dog. It was an anapsid reptile – which means it didn’t have the openings in the sides of its skull that therapsids and pelycosaurs had. No, it was in the same classification category as turtles are today.