Holotype

Menner, V. V. (1948) Ostatki pleziozavrov iz sredneyurskikh otlozhenii vostochnoi Sibin [Remains of plesiosaurs from Middle Jurassic deposits of eastern Siberia]; Bylleten' Moskovskogo Obshchestva Ispytatelei Prirody, Otdel Geologicheskii, 59, pp.1-5