Kroh, A.; Mooi, R. (2021). World Echinoidea Database. Oligopygus de Loriol, 1887 †. Accessed through: Marine Species Traits editorial board (2021) Marine Species Traits at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=512663 on 2025-05-11
Marine Species Traits editorial board (2025). Marine Species Traits. Oligopygus de Loriol, 1887 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=512663 on 2025-05-11