Trilobita - Agnostida - Weymouthiidae

Parent taxon: Weymouthiidae according to H. B. Whittington et al. 1997

Sister taxa: Abakolia, Acidiscus, Acimetopus, Analox, Bathydiscus, Bolboparia, Cephalopyge, Cobboldites, Leptochilodiscus, Mallagnostus, Runcinodiscus, Serrodiscus, Tannudiscus

Subtaxa: Weymouthia nobilis

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Ecology: slow-moving nektonic suspension feeder