STYGINA, EOBRONTEUS (ORDOVICIAN STYGINIDAE, TRILOBITA): MORPHOLOGY, CLASSIFICATION, AND AFFINITIES OF ILLAENIDAE

The fulcrate thorax of Stygina has the articulating furrow and a long articulating halfring, no pleural furrow, and the facetted outer portion of the pleura has the doublure terminating outside the fulcrum. In the type species the glabella is inflated and the axial furrows partially effaced; in othe...

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