Osteostraci

Parent taxon: Osteostracomorphi according to R. van der Laan 2019

See also Dineley and Metcalf 1999, Gadow 1898, Hay 1902, Long 2011, Nelson et al. 2016 and Obruchev 1964

Sister taxa: Cephalaspidomorphi, Galeaspidomorphi, Halecopsidae

Subtaxa: Ateleaspidiformes Benneviaspidida Benneviaspidiformes Camptaspis Cephalaspidiformes Cornuata Thyestiformes Thyestiida Tremataspidida Tremataspidiformes Waengsjoeaspis Yvonaspis Zenaspidida

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Ecology:

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