English: Cladogram depicting the supposed relationships between most know species of the genus Trimerocephalus, order Phacopida, family Phacopidae, based on Crônier, C. (2003). "Systematic relationships of the blind phacopine trilobite Trimerocephalus, with a new species from Causses−et−Veyran, Montagne Noire". Acta Palaeontologica Polonica 48(1): 55–70
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