MolluscaBase name details
original description
(of Cyclas ryckholti Normand, 1844) Normand, N. A. J. (1844). Notice sur plusieurs nouvelles espèces de Cyclades découvertes dans les environs de Valenciennes. Paris; Valenciennes, A., 8 pp., plate 1. , available online at http://biodiversitylibrary.org/page/35730160
page(s): 7, figs. 5-6; note: as Cyclas ryckholtii. [details]
basis of record
Sterki, V. (1902). Some notes on the North American Calyculinae, with new species. <em>The Nautilus.</em> 16(8): 89-93., available online at http://biodiversitylibrary.org/page/1754364
page(s): 93; note: As Calyculina rykolti [details]