Kroh, A.; Mooi, R. (2021). World Echinoidea Database. Paleopneustoidea A. Agassiz, 1904. Accessed through: Marine Species Traits editorial board (2021) Marine Species Traits at: http://marinespecies.org/traits/aphia.php?p=taxdetails&id=852320 on 2024-05-20
Marine Species Traits editorial board (2024). Marine Species Traits. Paleopneustoidea A. Agassiz, 1904. Accessed at: https://www.marinespecies.org/traits./aphia.php?p=taxdetails&id=852320 on 2024-05-20