| ! Hydroides operculatus (Treadwell, 1929) | Synonym (WoRMs) |
| Status | senior synonym, new combination, misspelling |
| ICZN valid name | No |
| Status ref. | Zenetos, A., M.E. Çinar, M.A. Pancuci-Papadopoulou, J.-G. Harmelin, G. Furnari, F. Andaloro, N. Belou, N. Streftaris and H. Zibrowius, 2005 |
| Comment | Incorrect subsequent spelling (gender agreement) |