Polychaetes of Greece: an updated and annotated checklist Faulwetter, Sarah Simboura, Nomiki Katsiaras, Nikolaos Chatzigeorgiou, Giorgos Arvanitidis, Christos Biodiversity Data Journal 2017 5 20997 20997 6VWCX Soederstroem, 1920 Soederstroem 1920 Polychaeta Spionidae Prionospio CoL Animalia Prionospio fallax Spionida 0 20997 Annelida species fallax  Notes Frequently reported from Greece and other parts of the Mediterranean ( Castelli et al. 2008, Ayari et al. 2009,  Cinaret al. 2014, Mikac 2015). Simboura (1996), after examination of material from Greece and in communication with other experts ( Sigvaldadottir, Mackie), concludes that several specimens from Europe erroneously identified as Prionospio malmgreni Claparede, 1870 actually belong to Prionospio fallax. In the original description, Prionospio malmgreniwas reported to have up to 9 pairs of branchiae, a character which was never found again in any specimen. The description of Prionospio malmgreni by Fauvel (1927)belongs to Prionospio fallax, leading to several misidentifications (  Sigvaldadottirand Mackie 1993). Prionospio malmgrenihas been considered an indeterminable species ( Maciolek 1985,  Sigvaldadottirand Mackie 1993) and it is suggested to assign previous Mediterranean records to Prionospio fallax(  Cinaret al. 2014, Mikac 2015).