English: A cladogram showing the relationship between several species of the genera Acidiscus, Bolboparia and Stigmadiscus, a clade belonging to the Weymouthiidae family. This cladogram is based on Westrom, S.R. and E. Landing (2011). Lower Cambrian (Branchian) eodiscoid trilobites from the lower Brigus Formation, Avalon Peninsula, Newfoundland, Canada. Memoirs of the Association of Australasian Palaeontologists 42:209-262, and consistent with Cotton, T.J.; Fortey, R.A. (2005). Comparative morphology and relationships of the Agnostida. In: Koenemann, S. & Jenner, R. Crustacean Issues 16, Crustacea and Arthropod Relationships. Boca Raton: CRC Press.
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