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 6MJML 1825788 Verrill, 1873 Verrill 1873 Polychaeta Serpulidae Hydroides CoL Animalia Hydroides dianthus Sabellida 0 20997 Annelida species dianthus  Notes Species complex. Hydroides dianthuswas originally described from Connecticut and long believed to be non-native in the Mediterranean ( Zibrowius 1973b, Zenetos et al. 2017). A recent study by Sun et al. (2017)shows, however, that Hydroides dianthuscould originate from the Mediterranean, as the species shows the highest genetic diversity in the Mediterranean (nine out of ten haplotypes present, as opposed to only two haplotypes in the USA). The authors recovered also a putative cryptic species, Hydroides cf. dianthus, probably originating from the Gulf of Mexico and apparently recently introduced to the Black Sea.