Oerstedia dorsalis var. cincta – synonym of Oerstedia dorsalis
Oerstedia dorsalis var. marmorata – synonym of Oerstedia dorsalis
Oerstedia dorsalis var. viridis – synonym of Oerstedia dorsalis
Omatoplea alba – synonym of Amphiporus lactifloreus
Omatoplea gracilis – synonym of Emplectonema gracile
Omatoplea maculosa – synonym of Emplectonema neesii
Omatoplea melanocephala – synonym of Tetrastemma melanocephalum
Omatoplea pulchra – synonym of Nipponnemertes pulcher
Omatoplea rosea – synonym of Amphiporus lactifloreus
Ommatoplea alba – synonym of Amphiporus lactifloreus
Ommatoplea alba var. rosea – synonym of Amphiporus lactifloreus
Ommatoplea gracilis – synonym of Emplectonema gracile
Ommatoplea melanocephala – synonym of Tetrastemma melanocephalum
Ommatoplea pulchra – synonym of Nipponnemertes pulcher
Ommatoplea purpurea – synonym of Emplectonema neesii
Ommatoplea rosea – synonym of Amphiporus lactifloreus