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--20997 Heteromastus filiformis ( Claparede , 1864) Notes Frequently reported from Greece and other parts of the Mediterranean; type locality: Mediterranean (Port-Vendres, France). Green (2002) clarified confusions that had arisen from typographic errors in the genus designation made by Hutchings and Rainer (1981) . However, a number of problems concerning the correct identification of the species still exist. Juvenile specimens can be confused with adults of Mediomastus species, since chaetigers four and five initially carry hooks which are replaced by capillaries with age ( Capaccioni-Azzati and El-Haddad 2015 ). In addition, different opinions regarding the presence and location of abdominal gills exist in literature ( Capaccioni-Azzati and El-Haddad 2015 ).