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- W4200102351 abstract "Varanids are the only non-avian sauropsids that are known to approach the warm-blooded mammals in stamina. Furthermore, a much higher maximum metabolic rate (MMR) gives endotherms (including birds) higher stamina than crocodiles, turtles, and non-varanid lepidosaurs. This has led researchers to hypothesize that mammalian endothermy evolved as a second step after the acquisition of elevated MMR in non-mammalian therapsids from a plesiomorphic state of low metabolic rates. In recent amniotes, MMR correlates with the index of blood flow into the femur ( Q i ), which is calculated from femoral length and the cross-sectional area of the nutrient foramen. Thus, Q i may serve as an indicator of MMR range in extinct animals. Using the Q i proxy and phylogenetic eigenvector maps, here we show that elevated MMRs evolved near the base of Synapsida. Non-mammalian synapsids, including caseids, edaphosaurids, sphenacodontids, dicynodonts, gorgonopsids, and non-mammalian cynodonts, show Q i values in the range of recent endotherms and varanids, suggesting that raised MMRs either evolved in synapsids shortly after the Synapsida-Sauropsida split in the Mississippian or that the low MMR of lepidosaurs and turtles is apomorphic, as has been postulated for crocodiles." @default.
- W4200102351 created "2021-12-31" @default.
- W4200102351 creator A5024600956 @default.
- W4200102351 creator A5026867018 @default.
- W4200102351 creator A5057205526 @default.
- W4200102351 creator A5089953781 @default.
- W4200102351 date "2021-12-24" @default.
- W4200102351 modified "2023-10-17" @default.
- W4200102351 title "High Blood Flow Into the Femur Indicates Elevated Aerobic Capacity in Synapsids Since the Synapsida-Sauropsida Split" @default.
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