Vernonaspis Explained

Vernonaspis is an extinct genus of jawless fish that lived in the Silurian in the Paleozoic approximately 419 million years ago, in what is now Canada and the Northeastern United States.^{[1] [2]}

Notes and References

1. Broad . D. S. . Lenz . A. C. . 1972 . A New Upper Silurian Species of Vernonaspis (Heterostraci) from Yukon Territory, Canada . Journal of Paleontology . 46 . 3 . 415–420 . 0022-3360.
2. Book: Denison, Robert H. . New Silurian Heterostraci from southeastern Yukon . Denison . Robert H. . Bamber . E. W. . Hovdebo . H. R. . Lenz . A. C. . 1963 . Chicago Natural History Museum . [Chicago].