LUDVIGSEN, ROLF & STEPHEN R. WESTROP - Revision of Acheilus and Theodenisia (Late Cambrian, Trilobita). /&/ Type Species of the Basal Ibexian Trilobite Corbinia Walcott, 1924.

1986. Journal of Paleontology Vol. 60, No. 1; pp. 61-67 & 68-75, 4+5 fig./plts. Orig. extract, very good.

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