Abstract
Development of pentameral symmetry in echinoderms occurred by coiling and closing up of bilateral asymmetrical trimeral metamery, characteristic of ancestral echinoderms. It originated in the ambulacral system and further developed in other systems under the influence of the original metamery and primary bilateral asymmetry. Stages of the development of pentameral symmetry on the basis of bilateral symmetry are recognized in the morphology of the ambulacral system of the earliest echinoderms.
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Rozhnov, S.V. Development of symmetry and asymmetry in the early evolution of the echinoderms. Paleontol. J. 46, 780–792 (2012). https://doi.org/10.1134/S0031030112080114
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DOI: https://doi.org/10.1134/S0031030112080114