Abstract
Phylum Brachiopoda evolved from the other Metazoa long before the beginning of the Cambrian and have had a long evolution way before the origin of the mineral skeleton in Early Cambrian representatives. According to their food preferences, brachiopods divided into two groups probably in Precambrian that determined the differences in digestive enzyme compositions. The increasing concentration of oxygen in sea water in the Vendian period stimulated the rates of animal radiation as well as paleogeographic and paleoecological conditions, prevaling temperatures and sea water chemistry favored the development of mineral skeletons to the beginning of the Cambrian period. The calcium phosphate and calcium carbonate shells originated in two different groups of brachiopods Linguliformea and Rhynchonelliformea respectively most likely due to the biochemical differences related to their food preferences.
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Ushatinskaya, G.T. What might cause the differences in the shell composition of the earliest Brachiopods?. Paleontol. J. 48, 1502–1510 (2014). https://doi.org/10.1134/S0031030114140159
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DOI: https://doi.org/10.1134/S0031030114140159