World Register of Marine Species (WoRMS)
Walter, T.C.; Boxshall, G. (2026). World of Copepods Database. Drepanopsis orbus Tanaka, 1956. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=364852 on 2026-08-25
Tanaka, O. (1956). The pelagic copepods of the Izu region, Middle Japan. Systematic account II. Families Paracalanidae and Pseudocalanidae. Publications of the Seto Marine Biological Laboratory 5(3):367-406, figs. 6-22. (20-xii-1956)