Calyptaulax
Calyptaulax is a genus of trilobites in the order Phacopida that existed during the middle and upper Ordovician in what is now the U.S. states of New York, Pennsylvania, Oklahoma, Illinois, Missouri, Virginia, Vermont, Nevada, Iowa, Wisconsin, Kentucky, and Iowa, as well as the Canadian provinces of Ontario, Newfoundland and Labrador, Quebec, and the territory of Nunavut. Other countries Calyptaulax fossils are known from include Ireland, Norway, Russia, and the United Kingdom.
Type species
By original designation; Calyptaulax glabella Cooper, 1930: pp. 388 - 389, pl. 5, figs. 9 - 11. From the Matapedia Group, Perce, Quebec, Canada.
Other species
Calyptaulax annulata Raymond, 1905Calyptaulax callicephala Hall, 1847Calyptaulax callirachis Cooper, 1953Calyptaulax cornwalli Ross, Jr. and Barnes, 1967Calyptaulax holstonensis Raymond, 1925Calyptaulax incepta Whittington, 1965Calyptaulax norvegicus Stormer, 1945Calyptaulax sillimani Roy, 1941Calyptaulax strasburgensis Ulrich and Delo, 1940