Hartlaub, C. (1897). Die Hydromedusen Helgolands. <em>Wissenschaftliche Meeresuntersuchungen.</em> 2: 449-536, pls 14-23., available online athttps://www.biodiversitylibrary.org/page/14748081 page(s): 502, pl. 20 figs 9-11 [details]
Schuchert, P. (2024). World Hydrozoa Database. Opercularella nana Hartlaub, 1897. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=292292 on 2024-07-27
original descriptionHartlaub, C. (1897). Die Hydromedusen Helgolands. <em>Wissenschaftliche Meeresuntersuchungen.</em> 2: 449-536, pls 14-23., available online athttps://www.biodiversitylibrary.org/page/14748081 page(s): 502, pl. 20 figs 9-11 [details]