original description
Bartsch, P. (1931). Descriptions of new marine mollusks from Panama, with a figure of the genotype of <i>Engina</i>. <em>Proceedings of the United States National Museum.</em> 79 (15) [2881]: 1–10, 1 pl., available online at https://www.biodiversitylibrary.org/page/7523572
page(s): 5-7 [details]
additional source
Sleurs W.J.M. (1989) A zoogeographical analysis of the rissoinine fauna of the eastern Pacific with special reference to a comparison with the Caribbean fauna and with a checklist of the eastern Pacific Rissoininae Stimpson, 1865 (Mollusca: Gastropoda). <i> Annales de la Société Royale Zoologique de Belgique</i> 119(2): 155-164. [details]
additional source
Faber M.J. & Moolenbeek R.G. (2013) Two new species of Rissoinidae from Guadeloupe (Gastropoda: Rissooidea). <i>Miscellanea Malacologica</i> 6(1): 9-14. [5 June 2013] [details]
additional source
Keen, A. M. (1971). Sea Shells of Tropical West America. Marine mollusks from Baja California to Peru. ed. 2. Stanford University Press. xv, 1064 pp., 22 pls. [details]
From editor or global species database