original description
Beklemischev, W. N. (1927). Uber die Turbellarienfauna des Aralsees. Zugleich ein Beitrag zur Morphologie und zum System der Dalyelliida. <em>Zoologische Jahrbücher. Abteilung Systematik, Ökologie und Geografie der Tiere.</em> 54: 87-138. [details] Available for editors 
From editor or global species database
Taxonomic remark Beklemischev (1928) describes Koinocystis relicta as a new species without mentioning Acrorhynchus relictus, which is a nomen nudum in his 1922 contribution. From the text it is clear, however, that it is the same species. Therefore, the combination A. relictus is linked to K. relicta [details]