monos=greek for single, lithos=greek for stone, referring to the single lithocyte in the statocyst in all three studied
specimens
Meyer-Wachsmuth, I.; Curini Galletti, M.; Jondelius, U. (2014). Hyper-Cryptic Marine Meiofauna: Species Complexes in Nemertodermatida. <em>PLoS ONE.</em> 9(9): e107688.