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†order Harpetida Whittington 1959 (trilobite)

Trilobita - Libristoma

Synonym: Harpina Whittington 1959

Parent taxon: Librostoma according to M. C. Ebach and K. J. McNamara 2002

Sister taxa: Asaphida, Librostoma

Subtaxa: Entomaspididae, Harpetidae, Harpididae

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Ecology: fast-moving low-level epifaunal carnivore