Bock, P. (2021). World List of Bryozoa. Ptilotrypa Ulrich in Miller, 1889 †. Accessed through: Marine Species Traits editorial board (2021) Marine Species Traits at: http://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1378296 on 2024-06-20
Marine Species Traits editorial board (2024). Marine Species Traits. Ptilotrypa Ulrich in Miller, 1889 †. Accessed at: https://www.marinespecies.org/traits/aphia.php?p=taxdetails&id=1378296 on 2024-06-20