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Nortonechinus welleri Thomas, 1924; University of Iowa Paleontological Collections 3044 (holotype). Lime Creek Shale, Cerro Gordo Member, Devonian, Portland, Cerro Gordo County, Iowa, USA. Upper surface. Maximum width of specimen 61 mm.
Nortonechinus welleri Thomas, 1924; University of Iowa Paleontological Collections 3044 (holotype). Lime Creek Shale, Cerro Gordo Member, Devonian, Portland, Cerro Gordo County, Iowa, USA. Upper surface.
Maximum width of specimen 61 mm.
