Okada, Y.; Mawatari, S. (1937). On the collection of Bryozoa along the coast of Onagawa Bay and its vicinity, the northern part of Honshu, Japan. <em>Science Reports Tôhoku Univ.</em> 11: 433-445.[details]
Bock, P. (2024). World List of Bryozoa. Petraliella umbonata Okada & Mawatari, 1937. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=471786 on 2024-07-29
original descriptionOkada, Y.; Mawatari, S. (1937). On the collection of Bryozoa along the coast of Onagawa Bay and its vicinity, the northern part of Honshu, Japan. <em>Science Reports Tôhoku Univ.</em> 11: 433-445.[details]
Present Present in aphia/obis/gbif/idigbio Inaccurate Introduced: alien Containing type locality