Alainaspis

{{Short description|Extinct genus of jawless fishes}}

{{Italic title}}

{{Taxobox

| name = Alainaspis platyrhina

| fossil_range = {{fossil_range|Upper Silurian}}

| regnum = Animalia

| phylum = Chordate

| classis = Heterostraci

| ordo = Cyathaspidiformes

| subordo = Cyathaspidida

| familia = Ctenaspidae

| genus = Alainaspis

| genus_authority = Elliott & Dineley, 1985

| species = A. platyrhina

| binomial = Alainaspis platyrhina

| binomial_authority = Elliott & Dineley, 1985

}}

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.{{cite journal |author=David K. Elliott & David L. Dineley |year=1985 |title=A new heterostracan from the Upper Silurian of Northwest Territories, Canada |journal=Journal of Vertebrate Paleontology |volume=5 |issue=2 |pages=103–110 |jstor=4523034 |doi=10.1080/02724634.1985.10011848}} It was first named by David Elliott and David Dineley in 1985, and is placed in the monotypic genus Alainaspis, closely related to Boothiaspis.{{cite journal |author=David K. Elliott & David L. Dineley |year=1991 |title=Additional information on Alainaspis and Boothiaspis, cyathaspidids (Agnatha: Heterostraci) from the Upper Silurian of Northwest Territories, Canada |journal=Journal of Paleontology |volume=65 |issue=2 |pages=308–313 |doi=10.1017/S0022336000020540 |jstor=1305766}}