Mesosaurs ("middle lizards") were a group of small aquatic reptiles that lived during the early Permian period (Cisuralian), roughly 299 to 270 million years ago. Mesosaurs were the first known aquatic reptiles, having apparently returned to an aquatic lifestyle from more terrestrial ancestors.

Mesosaurus (meaning "middle lizard") is an extinct genus of reptile from the Early Permian of southern Africa and South America. Along with it, the genera Brazilosaurus and Stereosternum, it is a member of the family Mesosauridae and the order Mesosauria.

中龍屬 （屬名： [Mesosaurus] 错误： { {Lang}}：文本有斜体标记（帮助））是一种小型水生 爬行动物，生存于 二叠纪 早期的 南美洲 和 南非。 身长可达1 米。 生活于 盐湖 之中 [1]。 中龍是最早回到水中生存的 爬行動物 之一，身長約1公尺，牠的腳掌有蹼，身體呈流線型，長尾巴呈鰭狀。 因為後腿比較長，加上尾巴靈活，被推測是用來在水中推動身體往前進。 中龍的身體靈活，使牠們可以輕易地做出側向運動、向前推進，但因為粗厚的 肋骨，牠們不能扭轉身體 [2]。 中龍擁有小 …

2023年11月30日 · What Is a Mesosaur? A Mesosaur is an extinct semi-aquatic reptile. As one of the earliest known reptiles to have returned to an aquatic lifestyle, Mesosaurs have provided valuable insights into the early adaptations of reptiles to different environments. When Did Mesosaurs Live?

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 …

2018年7月26日 · Mesosaurs have been considered strictly aquatic animals. Their adaptations to the aquatic environment are well known and include putative viviparity, along with the presence of several skeletal characters such as a long, laterally compressed tail, long limbs, the foot larger than the manus, and presence of pachyosteosclerotic bones.

2024年12月25日 · 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.

Mesosaurs are among the most amazing extinct animals; they are the oldest known reptiles that developed aquatic adaptations, although how terrestrial their ancestors had become remains to be established; they are the only known vertebrates from Gondwana at the Early Permian and they are represented by thousands of well preserved and almost compl...

2018年10月8日 · Image of Mesosaurus: A comprehensive analysis of fossilized Mesosaurus bones reveals adult specimens have similar anatomical features to terrestrial animals: Frontiers in Ecology and Evolution. The study suggests older mesosaurs were semi-aquatic, whereas juveniles spent most of their time in the water. Image: Roman Yevseyev and Graciela Piñeiro.

Mesosaurs ("middle lizards") were a group of small aquatic reptiles that lived during the early Permian period (Cisuralian), roughly 299 to 270 million years ago. Mesosaurs were the first known aquatic reptiles, having apparently returned to an aquatic lifestyle from more terrestrial ancestors.