Iphinereis fucicola – synonym of Platynereis dumerilii
Iphinereis fucicola Malmgren, 1865 – synonym of Platynereis dumerilii
Iphione muricata – synonym of Gattyana cirrosa
Iphione muricata Gibson, 1886 – synonym of Gattyana cirrosa
Iphitime hartmanae Kirkegaard, 1977 – synonym of Iphitime hartmanae
Isocirrus planiceps Arwidsson, 1906 – synonym of Isocirrus planiceps