Ctenodonta recurva

Soot-Ryen, H.; Soot-Ryen, T. (1960). The Middle Ordovician of the Oslo Region, Norway. 11. Pelecypoda. <em>Norsk Geologisk Tidsskrift.</em> 40: 81-122.

Ulrich, E. O.; Scofield, W. H. (1894). The Lower Silurian Lamellibranchiata of Minnesota. In: E. O. Ulrich, W. H. Scofield, J. M. Clarke & N. H. Winchell (eds), Final Report of the Geological and Natural History Survey of Minnesota, vol. 3, part 2, The Geology of Minnesota. Paleontology. p. 475–628, pl. 35–46.