Trilobita - Agnostida - Weymouthiidae

Synonym: Costadiscus Babcock 1994

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

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

Subtaxa: none

Ecology: slow-moving nektonic suspension feeder