Structure of Trilobites

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THE trilobites are generally recognized as occupying a key position in relation to the phylogeny of arthropods, and until we have some certainty as to their structure and relationships it is not possible to speculate profitably about the mutual affinities of insects, crustaceans and arachnids. In the course of the last sixty years, a great deal of information regarding their appendages has been obtained, for the most part by American palaeontologists; but the results of different investigators have not been easy to reconcile and very divergent conclusions have been drawn regarding the systematic position of the group.

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    Geol. Mag., 59, 553 (1922).

  2. 2

    "Studies on Trilobite Morphology. Part I. The Thoracic Appendages and their Phylogenetic Significance". (Norsk Geol. Tidsskr., 19, 143–723, 12 pls., text-flgs.)

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Calman, W. Structure of Trilobites. Nature 143, 1077 (1939) doi:10.1038/1431077a0

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