Amphiporus neesii – synonym of Emplectonema neesii
Amphiporus pulcher – synonym of Nipponnemertes pulcher
Ascaris longissima – synonym of Lineus longissimus
Astemma filiformis – synonym of Procephalothrix filiformis
Astemma gordius – synonym of Oerstedia dorsalis
Astemma rufifrons – synonym of Cephalothrix rufifrons