original description
Walker, B. (1925). New species of North American Ancylidae and Lancidae. <em>Occasional Papers of the Museum of Zoology, University of Michigan.</em> 165: 1-13., available online at https://deepblue.lib.umich.edu/bitstream/handle/2027.42/56604/OP165.pdf?sequence=1&isAllowed=y
page(s): 1, pl. I, fig. 1-2, pl. II, fig. 1 [details]
source of synonymy
Henderson, J. (1930). <em>Ancylus coloradensis</em>, new name for <em>A. hendersoni</em> Walker, 1925, not 1908 <em>The Nautilus</em>. 44(1): 31, available online at https://www.biodiversitylibrary.org/page/8514862 [details]
From editor or global species database
Type locality USA, Colorado, Eldora Lake, Boulder Co. [details]