†suborder Cyathaspidoidei (jawless fish)

Pteraspidomorpha - Cyathaspidiformes

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

Sister taxa: Amphiaspidoidei, Cyathaspididae, Hibernaspidoidei, Siberiaspidoidei

Subtaxa: Americaspidae Anglaspidae Dictyaspidellidae Dictyonaspidae Dinaspidellidae Irregularaspidae Torpedaspididae

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Ecology: planktonic suspension feeder

Distribution:

• Devonian of Canada (4: Nunavut collections)

• Silurian of Canada (3: Nunavut)

Total: 7 collections each including a single occurrence

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