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Mesosaurs ("middle lizards") were a group of small aquatic reptiles that lived during the early Permian period, 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. It is uncertain which and how many terrestrial traits these ancestors displayed; recent research cannot establish with confidence if the first amniotes were fully terrestrial, or only amphibious. Most authors consider mesosaurs to have been aquatic, although adult animals may have been amphibious, rather than completely aquatic, as indicated by their moderate skeletal adaptations to a semiaquatic lifestyle. Similarly, their affinities are uncertain; they may have been among the most basal sauropsids or among the

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rdfs:label
  • عظايا وسيطة (ar)
  • Mesosàurids (ca)
  • Mesosauridae (es)
  • Mesosauridae (fr)
  • Mesosaur (en)
  • 중룡목 (ko)
  • Mesosauridae (ru)
  • 中龙科 (zh)
rdfs:comment
  • العظايا الوسيطة (الاسم العلمي:†Mesosauridae) هي فصيلة من الزواحف تتبع رتبة العظائيات الوسيطة من طائفة شبيهات الزواحف. (ar)
  • Els mesosàurids (Mesosauridae, "llangardaixos mitjans") eren una família de petits rèptils marins que visqueren durant el període Permià, aproximadament fa 320 a 280 milions d'anys. Aquests foren els primers rèptils que retornaren al mar després d'haver evolucionat a terra ferma. (ca)
  • Les Mesosauridae (mésosauridés en français) forment une famille éteinte de reptiles marins, classée comme parareptile, qui vivait durant le Permien inférieur (entre -290 et -270 millions d'années). Mésosaure signifie « reptile du milieu ». Ils furent les premiers reptiles (et donc amniotes) connus à se ré-adapter au milieu aquatique. Ces animaux, de façon variable selon le genre et l'espèce, étaient généralement de taille modeste, soit quelques dizaines de centimètres avec une exception connue à près de deux mètres. (fr)
  • 중룡목(中龍目, Mesosauria 메소사우리아[*])은 페름기 초기, 대략 2억 7천만 년 전에서 1억 9천 9백만 년 전까지 생존한 소형 수생 파충류들이다. 모든 속종이 메소사우루스과(Mesosauridae 메소사우리다에[*]) 1과에 속한다. 중룡류 동물들의 조상들은 육상 파충류였으나 이들은 바다로 돌아간 것으로 보이는데, 그 조상들이 얼마나 육상에 적응되어 있었는지는 불확실하다. 최근의 연구에서는 최초의 양막류가 육상동물이었는지 양서동물이었는지 여부도 확실하게 알 수 없다고 말하고 있다. 거의 대부분의 학자들은 중룡류가 완전 수생동물이었을 것이라고 생각하나, 골격 구조가 수생 생활에 완전히 적응하지 않았다는 점을 들어 양서동물이었을 것이라고 생각하는 학자들도 일부 있다. 오랫동안 중룡류는 연안의 얕은 물에서 살았을 것이라는 게 정설이었으나, 최근의 연구에서는 우루과이에 서식했던 것들은 깊은 고염 환경에서 서식했다는 것이 밝혀져 있다. (ko)
  • 中龙科（学名：Mesosauridae）是中龙目（Mesosauria）唯一一科，是一類已灭绝的爬行动物。牠们生活在大約2.99億到2.70亿年前的早二叠纪。牠們是最早的水棲爬行動物之一，在陸地上演化過後再度返回水中。 (zh)
  • Los mesosáuridos (Mesosauridae) (gr.: «lagartos intermedios») son una familia extinta de saurópsidos (reptiles) que vivieron en el período Pérmico, hace aproximadamente 320 y 280 millones de años. Los mesosáuridos fueron los primeros reptiles acuáticos, habiendo aparentemente regresado a un estilo de vida acuático a partir de ancestros terrestres. Sin embargo, como fue la transición a los mesosáuridos acuáticos permanece incierto; la investigación no ha podido establecer si de hecho los primeros amniotas eran completamente terrestres o anfibios.​ (es)
  • Mesosaurs ("middle lizards") were a group of small aquatic reptiles that lived during the early Permian period, 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. It is uncertain which and how many terrestrial traits these ancestors displayed; recent research cannot establish with confidence if the first amniotes were fully terrestrial, or only amphibious. Most authors consider mesosaurs to have been aquatic, although adult animals may have been amphibious, rather than completely aquatic, as indicated by their moderate skeletal adaptations to a semiaquatic lifestyle. Similarly, their affinities are uncertain; they may have been among the most basal sauropsids or among the (en)
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  • Mesosaurs (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Skull_anapsida_1.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Mesosaur_Fossil.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Mesosaurus_BW.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Skull_synapsida_1.svg
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