Hayward, B.W.; Le Coze, F.; Vachard, D.; Gross, O. (2024). World Foraminifera Database. Orbitoclypeus varians (Kaufmann, 1867) †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1042225 on 2024-09-14
original description(ofOrthophragmina isseli Prever, 1912 †)Prever, P. L. (1912). La fauna a Nummuliti e ad Orbitoidi dei terreni terziarii dell'alta valle dell'Aniene. <em>Tipografia nazionale di Giovanni Bertero.</em> 1-258.[details]
new combination referenceLess, G. (1987). Paleontology and stratigraphy of the European Orthophragminae. <em>Geologica Hungarica, series Paleontologica.</em> 51: 49-313., available online athttps://www.researchgate.net/publication/296504541[details] Available for editors [request]