Yvonaspis, nouveau genre d'Osteostraci (Vertebrata, Agnatha) du Dévonien (Emsien–Eifélien) des Grès de Gaspé (Québec, Canada)

1989/11/01 by Michel Belles-Isles · 2 citations
Earth and Planetary Sciences · #Paleontology and Evolutionary Biology

paper · doi:10.1139/e89-204

openalex publication_date 1989/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/05/21

Abstract

All Osteostracan species of the Gaspé Sandstones (Devonian of Canada), formerly attributed to the genus Cephalaspis, are referred here to the new genus Yvonaspis. The latter is characterized by the very elongated shape of the naso-hypophysal opening. This monophyletic genus may be the sister group of Parameteoraspis among cephalaspidians.

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• A new osteostracan fauna from the Devonian of the Welsh Borderlands and observations on the taxonomy and growth of Osteostraci
• Campbellton Formation [wikipedia]