pteraspidiformes

[US]//ˌtɛrəspɪˈdɪfɔːrmiːz//
[UK]//ˌtɛrəspɪˈdɪfɔːrmiːz//

Translation

n.An extinct order of jawless fish belonging to the class Pteraspidimorphi, known from the Early Silurian to the Late Devonian periods.

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