Abstract
The inner surface of the dorsal valve at the early developmental stages and the larval shells lacking adult shell are described for the first time for the Ordovician craniids. The presence of a larval calcareous shell in the Early Paleozoic craniids is proposed.
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References
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Original Russian Text © A.A. Madison, 2007, published in Paleontologicheskii Zhurnal, 2007, No. 3, pp. 16–18.
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Madison, A.A. First finds of larval shells of Ordovician craniids in the Pskov Region. Paleontol. J. 41, 248–251 (2007). https://doi.org/10.1134/S0031030107030033
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DOI: https://doi.org/10.1134/S0031030107030033