original description
(of Cyclas calyculata var. compressa Middendorff, 1851) Middendorff, A. T. von. (1851). Mollusken, pp. 163-464, pls. 8-30. - <i>In</i>: Brandt, F., Erichson, W. F., Fischer, S., Grube, E., Ménétriés, E. & Middendorff, A. T. von: Reise in den äussersten Norden und Osten Sibiriens während der Jahre 1843 und 1844. Band II. Zoologie. Theil 1. Wirbellose Thiere: Annulaten. Echinodermen. Insecten. Krebse. Mollusken. Parasiten. St. Petersburg: Buchdruckerei der Kaiserlichen Akademie der Wissenschaften, 516 pp., 32 pls. , available online at http://biodiversitylibrary.org/page/37047707
page(s): 288, pl. 29, fig. 9-10 [details]
basis of record
Vinarski, M. V.; Kantor, Yu. I. (2016). Analytical catalogue of fresh and brackish water molluscs of Russia and adjacent countries. A. N. Severtsov Institute of Ecology and Evolution of Russian Academy of Science, Moscow, 544 pp.
page(s): 95 [details] Available for editors [request]
From editor or global species database
Type locality Russia, the southern part of Kamchatka Peninsula (without a precise locality) [details]