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- W2045166601 abstract "A presentation of an hypothesis to explain the great increase in size, the bipedal posture and the sudden disappearance of the giant reptiles, with an interpretation of their death in terms of the fatal susceptibility of present-day reptiles to temperatures in excess of 45⚬ C. and the known thermal limit of 45⚬ C. for most metazoans. While positive geological evidence for lethal high temperatures is not available, indirect evidence suggests the possibility of extreme heat in circum-equatorial regions, which may have been comparable in intensity to the low temperature extremes which left their evidence in glaciation. If such an explanation is acceptable, the devices of feathers and fur may have evolved originally as a protection of skin and body from excessive insolation, rather than to conserve a probably negligible internal heat. The eventual development of effective internal heat production in conjunction with the previously supplied insulation, may have come as a response to the ebbing heat waves and thus have produced the comparatively efficient homoiotherms of to-day. It is proposed that for accuracy and clarity the term ectotherm with the subtypes heliotherm and thigmotherm be substituted for poikilotherm, and that endotherm be substituted for homoiotherm. When considered from the viewpoint of the organic requirements of heat, there appears to be a definite progression away from the vagaries of thigmothermism through the adoption of heliothermism, with eventual stabilization by endothermism." @default.
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- W2045166601 date "1940-11-01" @default.
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- W2045166601 title "Additional Implications of Reptilian Sensitivity to High Temperatures" @default.
- W2045166601 doi "https://doi.org/10.1086/280921" @default.
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