| Hydroides alatalateralis (M.L. Jones, 1962) |
| Hydroides bispinosa Bush, 1910 |
| Hydroides bispinosus Bush, 1910 |
| Hydroides brachyacantha Rioja, 1941 |
| Hydroides brachyacanthus Rioja, 1941 |
| Hydroides californicus Treadwell, 1929 |
| Hydroides cruciger Mörch, 1863 |
| Hydroides crucigera Mörch, 1863 |
| Hydroides deleoni Bastida-Zavala & ten Hove, 2003 |
| Hydroides dianthus (Verrill, 1873) |
| Hydroides dirampha Mörch, 1863 |
| Hydroides diramphus Mörch, 1863 |
| Hydroides dolabrus Tovar-Hernández, Villalobos-Guerrero, Kupriyanova & Y. Sun, 2016 |
| Hydroides elegans (Haswell, 1883) |
| Hydroides floridanus (Bush, 1910) |
| Hydroides gairacensis Augener, 1934 |
| Hydroides glandifer Rioja, 1941 |
| Hydroides gracilis (Bush, 1905) |
| Hydroides humilis (Bush, 1905) |
| Hydroides lambecki Bastida-Zavala & ten Hove, 2002 |