A thermal model of the sailback pelycosaur

  title={A thermal model of the sailback pelycosaur},
  author={Steven C. Haack},
  pages={450 - 458}
Standard techniques of energy exchange analysis are applied to modelling the thermal regimes of several species of sailback pelycosaurs. Of particular interest is the role played by the sail in thermoregulation. Although the sail did increase the rate at which the model could warm up in the morning, its effectiveness fell short of previous estimates. The sail increased the daytime internal temperature by typically 3°C to 6°C. The more massive subjects had the highest temperature increases owing… 

Aerodynamics and thermoregulatory function of the dorsal sail of Edaphosaurus

Wind tunnel modeling of air flow over a thin sail with laterally projecting cross-bars supports a thermoregulatory interpretation of the sail of Edaphosaurus, and measurements of heat flow in an instrumented model show that cross- Bars increase heat loss from the sail.

Natural environment and thermal behaviour of Dimetrodon limbatus.

Purbeck–Wealden (early Cretaceous) climates

Heat loss from giant extinct reptiles

  • G. Ruxton
  • Environmental Science
    Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 2001
It is shown that, in most circumstances, the rate at which heat is lost by a large body is significantly greater when it is immersed in water than whenIt is surrounded by air, assuming that the two fluids are at the same temperature.

Sauropod Necks: Are They Really for Heat Loss?

The functional combination of the allometric increase of neck area, the systems of air sacs in the neck and trunk, the active control of blood flow between the core and surface of the body, changing skin color, and strategic orientation of the neck with respect to wind, make it plausible that the neck could have functioned as a radiator to avoid over-heating.

Evaluating the ecology of Spinosaurus: shoreline generalist or aquatic pursuit specialist?

The giant theropod Spinosaurus was an unusual animal and highly derived in many ways, and interpretations of its ecology remain controversial. Recent papers have added considerable knowledge of the

A Phylogenetic Perspective on Locomotory Strategies in Early Amniotes

This work investigates the major locomotory strategies that have been posited for Paleozoic amniotes by optimizing the major Locomotory styles identified for these taxa onto the consensus tree, in order to present an overview of the pattern of evolution of locomOTory strategies inherited and adopted by various amniote lineages.



A Mathematical Model for Body Temperatures of Large Reptiles: Implications for Dinosaur Ecology

These calculations show that a large reptile would have a relatively constant high body temperature when exposed to warm, diurnally fluctuating environmental conditions, even with a low metabolic rate, as long as the average values of the physical parameters result in a body temperature within tolerable limits.

Thermal Regulation in Sail Lizards

The sail of Dimetrodon grandis was the end form of an evolutionary series of pelycosaurs that had tended to develop increasingly large sails, with features strongly suggesting an early attempt at temperature regulation.

Relative growth in pelycosaurian reptiles

  • 1948

Principles of Heat Transfer. International Text book Co

  • 1967