Castorocauda (also known as the "Jurassic Beaver") is a genus of small, semi-aquatic relative of mammals that lived during the Middle Jurassic period, 164 million years ago, in lakebed sediments of the Daohugou Beds (possibly a member of the Jiulongshan formation) in Inner Mongolia. It was highly specialized, with adaptations evolved convergently with those of modern semi-aquatic mammals such as beavers, otters, and the platypus.
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- Castorocauda
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| - Castorocauda (also known as the "Jurassic Beaver") is a genus of small, semi-aquatic relative of mammals that lived during the Middle Jurassic period, 164 million years ago, in lakebed sediments of the Daohugou Beds (possibly a member of the Jiulongshan formation) in Inner Mongolia. It was highly specialized, with adaptations evolved convergently with those of modern semi-aquatic mammals such as beavers, otters, and the platypus.
- thumb|400pxEl Castorocauda era un mamífero primitivo cuadrúpedo y peludo que se caracterizaba por tener una cola ancha y escamosa que le servía como impulsor dentro del agua. El hecho de tener membrana interdigital en las patas traseras indica que el Castorocauda era un animal acuático. Tenía unas poderosas patas delanteras con las que cavaba en la arena unas pequeñas madrigueras en las que se refugiaba de los depredadores y ponía sus huevos, dado que era un mamífero ovíparo. Categoría:Mamíferos Categoría:Multituberculados Categoría:Fauna del Jurásico
- Castorocauda lutrasimilis is a member of the order Docodonta, which is a wholly extinct group of Mammaliaformes. It is not considered to be a mammal by the crown group definition, which takes the mammals to be the group containing the most recent common ancestor of all living mammals (the monotremes, placentals, and marsupials) and its descendants. Many writers, however, do not define Mammalia as a crown group; Kielan-Jaworowska et al. (2004), for example, defines Mammalia as the group originating with the last common ancestor of Sinoconodon and living mammals, a definition that includes Docodonta.[1]
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| - (Ji et al., 2006)
- *C. lutrasimilis
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| abstract
| - Castorocauda (also known as the "Jurassic Beaver") is a genus of small, semi-aquatic relative of mammals that lived during the Middle Jurassic period, 164 million years ago, in lakebed sediments of the Daohugou Beds (possibly a member of the Jiulongshan formation) in Inner Mongolia. It was highly specialized, with adaptations evolved convergently with those of modern semi-aquatic mammals such as beavers, otters, and the platypus.
- thumb|400pxEl Castorocauda era un mamífero primitivo cuadrúpedo y peludo que se caracterizaba por tener una cola ancha y escamosa que le servía como impulsor dentro del agua. El hecho de tener membrana interdigital en las patas traseras indica que el Castorocauda era un animal acuático. Tenía unas poderosas patas delanteras con las que cavaba en la arena unas pequeñas madrigueras en las que se refugiaba de los depredadores y ponía sus huevos, dado que era un mamífero ovíparo. Categoría:Mamíferos Categoría:Multituberculados Categoría:Fauna del Jurásico
- Castorocauda lutrasimilis is a member of the order Docodonta, which is a wholly extinct group of Mammaliaformes. It is not considered to be a mammal by the crown group definition, which takes the mammals to be the group containing the most recent common ancestor of all living mammals (the monotremes, placentals, and marsupials) and its descendants. Many writers, however, do not define Mammalia as a crown group; Kielan-Jaworowska et al. (2004), for example, defines Mammalia as the group originating with the last common ancestor of Sinoconodon and living mammals, a definition that includes Docodonta.[1] A Castorocauda fossil was discovered in 2004 in the fossil-rich beds of Liaoning province, China; it was reported in the journal Science by an international team led by Qiang Ji of Nanjing University.[2] The fossil was so well preserved that an important feature of its soft anatomy — hair — was preserved. Hair is present in all modern mammals and is therefore assumed, under principles of maximum parsimony, to have been present in all descendants of the last common ancestor of Castorocauda and today's mammals, including crown mammals and other docodonts. The hair appears to have been a very advanced dense pelage including guard hairs and underfur. The tiny auditory ossicles of the middle ear and associated areas were also well preserved in this Castorocauda fossil. Features of these bones confirms the evolutionary position of docodonts as more closely related to crown-group mammals than is Morganucodon. They are, however, less closely related to living mammals than is Hadrocodium. Among docodonts, Castorocauda appears to have been related to Krusatodon and Simpsonodon, both European animals. This may be evidence that Europe and Asia underwent a faunal interchange in the Middle Jurassic. The two continents would later be separated by the Turgai Strait.
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