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†subclass Heterostraci Lankester 1868 (jawless fish)

Pteraspidomorpha

Synonym: Pteraspidomorphes

Parent taxon: Pteraspidomorpha according to R. Van Der Laan 2019

See also Blieck et al. 2002, Bryant 1932, Dineley and Metcalf 1999, Elliot and Loeffler 1989, Elliott 2016, Elliott 2013, Elliott and Ilyes 1996, Elliott and Swift 2010, Gadow 1898, Hay 1902, Jaekel 1911, Jordan 1963, Loeffler and Dineley 1976, Long 2011, Nelson et al. 2016, Ritchie and Gilbert-Tomlinson 1977 and Sepkoski 2002

Sister taxa: Arandaspida, Astraspida

Subtaxa: Alainaspis Allocryptaspis Amphiaspidiformes Anatolepsis Aporemaspis Archodus Ariaspididae Aserotaspis Asketaspis Aspidosteus Athenaegis Cardipeltida Cardipeltidae Cardipeltiformes Ceraspidae Clydonaspis Corvaspidida Corvaspidiformes Corveolepis Cyathaspida Cyathaspidiformes Drepanaspidae Dyreaspis Ennosviaspis Grumantaspis Guerichosteidae Gunaspis Homaspidella Irregulariaspis Karelosteus Kiangsuaspis Lepidaspidida Lepidaspidiformes Listraspis Munchoaspis Obliaspis Olbiaspidida Palaeaspidi Palaeodus Pilolepsis Pionaspis Poriferaspis Protaspidae Psammolepis Psammosteiformes Pteraspidi Pteraspidiformes Pycnaspis Rimasventeraspis Schizosteus Seretaspis Steinaspis Strophisterus Strosipherus Tesseraspidida Tesseraspidiformes Tolypelepidida Tolypelepidiformes Toombsaspis Traquairaspidida Traquairaspidiformes Yoglinia

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Ecology:

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