SOME ASPECTS OF THE ECOLOGY AND GROWTH OF THE CARBONIFEROUS GIGANTOPRODUCTIDS

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Abstract
SUMMARY: The hinge width and degree of curvature of the valves of gigantoproductid brachiopods are shown to be related to the population density and to the nature of the substrate on which the animal lived. Statistical studies of their growth are discussed and two models of growth, leading to either an alate or a globose form, are proposed. Preferred orientation of these brachiopods has been noted and followed up with experimental work on models, involving the use of a flume. It is suggested that the shape of the shell may also reflect certain hydrodynamic requirements.