Canonia is an extinct genus of jawless fish found in Canada. There are two species in this genus, C. grossi and C. costulata.Vieth, J., 1980: Thelodontier-, Acanthodier-, und Elasmobranchier- Schuppen aus dem Unter-Devon der kanadischen Arktis (Agnatha, Pisces). Göttinger Arbeiten zur Geologie und Paläontologie, 23: 1-69. The C.grossi species is thought to be from the Devonian Period (Early Lochkovian). Fossils of C.grossi have been found in the Boothia Peninsula. Isolated scales of Canonia are streamlined to minimize drag, similar to modern sharks capable of strong swimming in open waters.
See also List of prehistoric jawless fish genera List of thelodont genera
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