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Tetrapterygidae
Tetrapterygidae (meaning "four-wings") is a group of four-winged dinosaurs proposed by Sankar Chatterjee in the second edition of his book ''The Rise of Birds: 225 Million Years of Evolution'', where he included ''Microraptor'', ''Xiaotingia'', ''Aurornis'', and ''Anchiornis''.〔Chatterjee, S. (2015). ''The Rise of Birds: 225 Million Years of Evolution'', second edition. Johns Hopkins University Press.〕 The group was named after the characteristically long flight feathers on the legs of all included species, as well as the theory that the evolution of bird flight may have gone through a four-winged (or "tetrapteryx") stage, first proposed by naturalist William Beebe in 1915.〔Beebe, C. W. A. (1915). "Tetrapteryx stage in the ancestry of birds." ''Zoologica'', 2: 38-52.〕 Chatterjee suggested that all dinosaurs with four wings formed a natural group exclusive of other paravians, and that this family was the sister taxon to the group Avialae, although most phylogenetic analyses have placed the animals of his Tetrapterygidae elsewhere in Paraves, such as ''Xiaotingia'', ''Aurornis'', and ''Anchiornis'' being placed in Avialae.
Here below is a diagram showing the proposed relationships within the family:
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==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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