uncertain > taxon inquirendum (Pereyeslawzewa (1892) described the species from one specimen only, which was quickly damaged. The figure (reproduced by Graff, 1913) possibly allows a positive identification in case the species is found again. )
(ofMacrorhynchus spiralis Pereyaslawzewa, 1892)Pereyaslawzewa, S. (1892). Monographie des Turbellariés de la Mer Noire. <em>Memoires de la Sociéte des Naturalistes de la Nouvelle-Russie.</em> 17: 1-303.[details]
Tyler, S., Artois, T.; Schilling, S.; Hooge, M.; Bush, L.F. (eds) (2006-2025). World List of turbellarian worms: Acoelomorpha, Catenulida, Rhabditophora. Acrorhynchides spiralis (Pereyaslawzewa, 1892) Strand, 1928. Accessed through: Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2025) European Register of Marine Species at: https://www.marbef.org/data/aphia.php?p=taxdetails&id=1512696 on 2026-07-08
Costello, M.J.; Bouchet, P.; Boxshall, G.; Arvanitidis, C.; Appeltans, W. (2026). European Register of Marine Species. Acrorhynchides spiralis (Pereyaslawzewa, 1892) Strand, 1928. Accessed at: https://vliz.be/vmdcdata/narms/narms.php?p=taxdetails&id=1512696 on 2026-07-08
original description(ofMacrorhynchus spiralis Pereyaslawzewa, 1892)Pereyaslawzewa, S. (1892). Monographie des Turbellariés de la Mer Noire. <em>Memoires de la Sociéte des Naturalistes de la Nouvelle-Russie.</em> 17: 1-303.[details]
Present Inaccurate Introduced: alien Containing type locality
Present 