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Evdonin, L. A. (1977). Monograph of the Turbellaria Kalyptorhynchia in the fauna of the USSR and adjacent areas. [In Russian]. Fauna USSR. Turbellaria, Vol 1, Pt 1. Fauna USSR (NS), 115:1-400
Evdonin, L. A. (1977). Monograph of the Turbellaria Kalyptorhynchia in the fauna of the USSR and adjacent areas. [In Russian]. Fauna USSR. Turbellaria, Vol 1, Pt 1. Fauna USSR (NS), 115:1-400