Osteostraci - Cornuata

Parent taxon: Osteostraci according to R. S. Sansom 2009

See also Janvier 1985 and Voichyshyn 2006

Sister taxa: Ateleaspidiformes, Benneviaspidida, Benneviaspidiformes, Camptaspis, Cephalaspidiformes, Thyestiformes, Thyestiida, Tremataspidida, Tremataspidiformes, Waengsjoeaspis, Yvonaspis, Zenaspidida

Subtaxa: Cephalaspidiens Hildenaspis

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Ecology: planktonic suspension feeder

Distribution: found only at Hahner Mill (Niederhof Mill, Hildenaspis-type locality), Ulpebach (Devonian of Germany)

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