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Lacertoidea
The Lacertoidea is a group of lizards that includes the Lacertidae, Teiidae, Gymnophthalmidae, and the burrowing Amphisbaenia.
Studies of anatomy have traditionally grouped the lacertoids with skinks,〔Gauthier, Jacques A., et al. "Assembling the squamate tree of life: Perspectives from the phenotype and the fossil record." Bulletin of the Peabody Museum of Natural History 53.1 (2012): 3-308.〕 however more recent studies focusing on DNA have placed them as a distinct group of lizards, more closely related to the venomous Toxicofera.〔Wiens, J. J., Hutter, C. R., Mulcahy, D. G., Noonan, B. P., Townsend, T. M., Sites, J. W., & Reeder, T. W. (2012). Resolving the phylogeny of lizards and snakes (Squamata) with extensive sampling of genes and species. Biology Letters, 8(6), 1043-1046.〕 The relationships of the Amphisbaenia to other lizards have long been a mystery. Although superficially snakelike, their anatomy and locomotion is quite distinct from that of snakes. However, they do not closely resemble any other group of lizards. Recent molecular studies suggest that amphisbaenians are grouped with the Lacertidae, in a group named the Lacertibaenia.〔
Lacertoids have a wide geographic distribution. The Lacertidae are found throughout Europe and Asia, with a major radiation endemic to Africa. The Teiidae are diverse in South America, but some members of the group occur in southern North America as well. The Amphisbaenia are especially widespread, occurring in North America, Europe, Africa, South America, and the Caribbean. The origins of the group are unclear. The oldest definitive lacertoid is the amphisbaenian ''Plesiorhineura'', from the early Paleocene of North America. Given that it resembles modern worm lizards, the lacertoids most likely appeared and diversified in the Cretaceous.
==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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