MolluscaBase taxon details
original description
(of Opeas orestias Preston, 1911) Preston, H.B. (1911). Descriptions of thirty-six new species of land and freshwater shells from British East Africa, chiefly from Mount Kenia and the neighbouring district. The Annals and Magazine of Natural History, (8) 7 (41): 463-476, pl. 11-12. London. [29 April]., available online at https://biodiversitylibrary.org/page/15815183
page(s): 474, pl. 12, fig. 30. [details]
new combination reference
Connolly, M. (1923). Notes on African non-marine Mollusca, with descriptions of many new species. The Annals and Magazine of Natural History, (9) 12 (72): 633-659, pl. 19. London. [27 November].
page(s): 647, pl. 19, fig. 50. [details]