Polychaetes of Greece: an updated and annotated checklist Author Faulwetter, Sarah Author Simboura, Nomiki Author Katsiaras, Nikolaos Author Chatzigeorgiou, Giorgos Author Arvanitidis, Christos text Biodiversity Data Journal 2017 5 20997 20997 http://dx.doi.org/10.3897/BDJ.5.e20997 journal article http://dx.doi.org/10.3897/BDJ.5.e20997 1314-2828-5-20997 Hydroides brachyacantha Rioja, 1941 Ecological interactions Native status Non-native (casual) Notes Species complex. Reported from Greece by Ulman et al. (2017) . In the Mediterranean also known from Israel ( Ben-Eliahu 1991a ), Turkey ( Cinar 2006 ) and Spain ( Ulman et al. 2017 ). Probably originating from the Mexican Pacific ( Ulman et al. 2017 ), but the species has been shown to constitute a complex of cryptic and pseudo-cryptic species ( Bastida-Zavala and ten Hove 2003 , Sun et al. 2016 ). The identity of Mediterranean specimens, their introduction status in the Mediterranean and the potential native range cannot be determined without molecular methods.