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Abstract
Morphological and quantitative characteristics of the growth variability of twoParvancorina species were analyzed based on new abundant material from the Vendian of the White Sea. Growth variability in this problematic taxon appears to be wider than previously suggested. We found allometric growth in the White Sea population ofP. minchami Glaessner, 1958, in contrast to isometric growth in Australian representatives of the species. Another White Sea species,P. sagitta Ivantsov, 2004, shows gradual formation of anchor-shaped structure in juveniles. Based on Australian material, it was previously believed that this structure did not change during ontogeny. These two distinctive features together with a strong variability of age-related measurements distinguishParvancorina from other early arthropods (Scania, Primicaris), and cast doubt on the growth pattern as an argument in favor of the arthropodan nature ofParvancorina.
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Paleontological Institute, Russian Academy of Sciences, Profsoyuznaya ul. 123, Moscow, 117997, Russia
E. B. Naimark & A. Yu. Ivantsov
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Correspondence toE. B. Naimark.
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Original Russian Text © E.B. Naimark, A.Yu. Ivantsov, 2009, published in Paleontologicheskii Zhurnal, 2009, No. 1, pp. 14–19.
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Naimark, E.B., Ivantsov, A.Y. Growth variability in the late Vendian problematicsParvancorina Glaessner.Paleontol. J.43, 12–18 (2009). https://doi.org/10.1134/S003103010901002X
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