作者: Richard Shine
DOI: 10.1007/978-94-009-6536-2_10
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摘要: Viviparity has evolved independently at least 95 times in squamates, and some cases more than once within a single genus. This high frequency of evolutionary origins means that there may be wide diversity physiological adaptations to live-bearing different (even congeneric) viviparous species. Also, hypotheses requiring comparison oviparous forms best carried out on closely-related forms. apparently most often species occupying cold climatic areas. Possible protoadaptations viviparity cold-climate reptiles, the apparent conservatism embryonic development rates thermal tolerances, deserve investigation.