Abstract
THE study of the newly discovered recent member of the Cambro-Silurian mollusc group Monoplacophora has caused me to extend investigations also to animals other than molluscs of the early Cambrian fauna. Then, I was struck by the appearance of some Olenellid Trilobites figured by Walcott1, showing additional segments behind what usually forms the long spine of the last segment (Fig. 1).
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References
Walcott, C. D., Smithsonian Misc. Coll., 53, No. 6 (1910).
Malaquin, A., “Recherches sur les Syllidiens”, Mém. Soc. Sci. Arts, Lille (1893).
Störmer, L., “Traité de Zool.”, 6, 159 (1949).
Snodgrass, R. E., “Textbook of Arthropod Anatomy” (Ithaca, N.Y., 1952).
Burling, L. D., Ottawa Naturalist, 30 (1916).
Raw, F., J. Palaeont., 31 (1957).
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LEMCHE, H. Supposed Asexual Reproduction in Trilobites. Nature 180, 801–802 (1957). https://doi.org/10.1038/180801a0
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DOI: https://doi.org/10.1038/180801a0
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