Petromyzontida - Cephalaspidiformes

Alternative spelling: Cephalaspidoformes

Synonym: Osteostraci Lankaster 1868

Parent taxon: Cephalaspidomorphi according to J. S. Nelson et al. 2016

See also Dineley and Metcalf 1999, Gadow 1898, Hay 1902, Long 2011, Obruchev 1964 and Sepkoski 2002

Sister taxa: Gilpichthyidae, Pipisciidae, Cephalaspidida, Atelaspidiformes, Pituriaspidiformes, Galeaspidiformes, Birkeniiformes

Subtaxa: Aachenaspis Ateleaspidiformes Benneviaspidida Benneviaspidiformes Camptaspis Cornuata Fieldingaspis Meelaidaspis Ohesaareaspis Thyestiida Tremataspidida Tremataspidiformes Tuvaspis Waengsjoeaspis Yvonaspis Zenaspidida

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Ecology: fast-moving nektonic carnivore

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