Alainaspis platyrhina is an extinct cyathaspidid heterostracan agnathan vertebrate which existed in a marine environment in what is now the Northwest Territories of Canada, during the upper Silurian period. It was first named by David Elliott and David Dineley in 1985, and is placed in the monotypic genus Alainaspis, closely related to Boothiaspis. References Cyathaspidida Silurian jawless fish Fossil taxa described in 1985 Fossils of Canada Cyathaspidiformes genera Paleontology in the Northwest Territories