Project 2804: J. D. Beech, J. C. Lamsdell, J. Álvaro. 2021. Phylogeny, disparity and mass extinction response in the trilobite order Harpetida. Papers in Palaeontology. 7 (4):2205-2225.
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dorsal brim
dorsal cephalon
dorsal thorax
dorsal trilobite
Various
ventral cephalon
ventral trilobite