Hydroides Gunnerus, 1768 (basis of record)
Hydroides adamaformis Pillai, 2009 (additional source)
Hydroides affinis (Marion, 1876) (status source)
Hydroides alatalateralis (Jones, 1962) (additional source)
Hydroides albiceps (Grube, 1870) (additional source)
Hydroides amri Sun, Wong, ten Hove, Hutchings, Williamson & Kupriyanova, 2015 (additional source)
Hydroides ancorispina Pillai, 1971 [original] (additional source)
Hydroides arnoldi Augener, 1918 (additional source)
Hydroides augeneri Zibrowius, 1973 (additional source)
Hydroides azorica Zibrowius, 1972 [original] (additional source)
Hydroides bandaensis Zibrowius, 1972 (additional source)
Hydroides bannerorum Bailey-Brock, 1991 (additional source)
Hydroides basispinosa Straughan, 1967 (additional source)
Hydroides bifurcata Pixell, 1913 (additional source)
Hydroides bisecta Imajima & ten Hove, 1989 (additional source)
Hydroides bispinosa Bush, 1910 (additional source)
Hydroides brachyacantha Rioja, 1941 (additional source)
Hydroides bulbosa ten Hove, 1990 (additional source)
Hydroides calopoma Zibrowius, 1973 (additional source)
Hydroides capensis Zibrowius, 1972 (additional source)
Hydroides caribensis ten Hove in Kupriyanova, Sun, Wong & ten Hove, 2023 (original description)
Hydroides chilensis Hartmann-Schröder, 1962 (additional source)
Hydroides crucigera Mörch, 1863 (additional source)
Hydroides dafnii (Amoureux, Rullier & Fishelson, 1978) (additional source)
Hydroides deleoni Bastida-Zavala & ten Hove, 2003 (additional source)
Hydroides dianthus (Verrill, 1873) (additional source)
Hydroides diplochone (Grube, 1878) (status source)
Hydroides dipoma (Schmarda, 1861) (additional source)
Hydroides dirampha Mörch, 1863 (additional source)
Hydroides dolabrus Tovar-Hernández, Villalobos-Guerrero, Kupriyanova & Sun, 2016 (additional source)
Hydroides elegans (Haswell, 1883) [nomen protectum] (additional source)
Hydroides elegantula (Bush, 1910) (additional source)
Hydroides euplaeana (Delle Chiaje, 1822 [1828?]) (status source)
Hydroides exaltata (Marenzeller, 1884) (additional source)
Hydroides externispina Straughan, 1967 (additional source)
Hydroides ezoensis Okuda, 1934 (additional source)
Hydroides floridana (Bush, 1910) (additional source)
Hydroides furcifera (Grube, 1878) (additional source)
Hydroides fusca Imajima, 1976 [original] (additional source)
Hydroides fusicola Mörch, 1863 (additional source)
Hydroides gairacensis Augener, 1934 (additional source)
Hydroides glandifera Rioja, 1941 (additional source)
Hydroides glasbyi Sun, Wong, ten Hove, Hutchings, Williamson & Kupriyanova, 2015 (additional source)
Hydroides gottfriedi Read, ten Hove, Sun & Kupriyanova, 2017 (additional source)
Hydroides gracilis (Bush, 1905) (additional source)
Hydroides helmata (Iroso, 1921) (additional source)
Hydroides heterocera (Grube, 1868) (additional source)
Hydroides heterofurcata Pillai, 1971 [original] (additional source)
Hydroides hexagona (Bosc, 1802) (status source)
Hydroides homoceros Pixell, 1913 (additional source)
Hydroides huanghaiensis Sun & Yang, 2000 (additional source)
Hydroides humilis (Bush, 1905) (additional source)
Hydroides ibarzabalae Bastida-Zavala & Salazar-Vallejo in Kupriyanova, Sun, Wong & ten Hove, 2023 (original description)
Hydroides inermis Monro, 1933 (additional source)
Hydroides inornata Pillai, 1960 [original name] (additional source)
Hydroides kimberleyensis Pillai, 2009 (additional source)
Hydroides lambecki Bastida-Zavala & ten Hove, 2002 (additional source)
Hydroides lirs Kupriyanova, Sun, ten Hove, Wong & Rouse, 2015 (additional source)
Hydroides longispinosa Imajima, 1976 [original] (additional source)
Hydroides longistylaris Chen & Wu, 1980 (additional source)
Hydroides malleolaspina Straughan, 1967 (additional source)
Hydroides microtis Mörch, 1863 (additional source)
Hydroides minax (Grube, 1878) (additional source)
Hydroides mongeslopezi Rioja, 1958 (additional source)
Hydroides monroi Zibrowius, 1973 (additional source)
Hydroides mucronata Rioja, 1958 [original] (additional source)
Hydroides mucronatoides ten Hove in Kupriyanova, Sun, Wong & ten Hove, 2023 (original description)
Hydroides multispinosa Marenzeller, 1884 [original] (additional source)
Hydroides nanhaiensis Wu & Chen, 1981 (additional source)
Hydroides nigra Zibrowius, 1971 [original] (additional source)
Hydroides nikae Sun, Wong, Tovar-Hernández, Williamson & Kupriyanova, 2016 (additional source)
Hydroides nodosa Straughan, 1967 (additional source)
Hydroides norvegica Gunnerus, 1768 (additional source)
Hydroides novaepommeraniae Augener, 1925 (additional source)
Hydroides ochotereana Rioja, 1941 (additional source)
Hydroides operculata (Treadwell, 1929) (additional source)
Hydroides panamensis Bastida-Zavala & ten Hove, 2003 (additional source)
Hydroides parva (Treadwell, 1902) (additional source)
Hydroides pectinata (Philippi, 1844) (status source)
Hydroides perezi Fauvel, 1918 [original] (additional source)
Hydroides plateni (Kinberg, 1867) (additional source)
Hydroides prisca Pillai, 1971 (additional source)
Hydroides protulicola Benedict, 1887 (additional source)
Hydroides pseudexaltata Pillai, 2009 (basis of record)
Hydroides pseudouncinata africana Zibrowius, 1971 (additional source)
Hydroides pseudouncinata pseudouncinata Zibrowius, 1968 (additional source)
Hydroides qiui Sun, Wong, ten Hove, Hutchings, Williamson & Kupriyanova, 2015 (additional source)
Hydroides ralumiana Augener, 1927 (additional source)
Hydroides recta Straughan, 1967 (additional source)
Hydroides recurvispina Rioja, 1941 (additional source)
Hydroides rhombobula Chen & Wu, 1980 (additional source)
Hydroides rzhavskyi ten Hove in Kupriyanova, Sun, Wong & ten Hove, 2023 (original description)
Hydroides salazarvallejoi Bastida-Zavala & ten Hove, 2002 (additional source)
Hydroides sanctaecrucis Krøyer in Mörch, 1863 (additional source)
Hydroides sceptrifera ten Hove in Kupriyanova, Sun, Wong & ten Hove, 2023 (original description)
Hydroides similis (Treadwell, 1929) (additional source)
Hydroides similoides Bastida-Zavala & ten Hove, 2002 (additional source)
Hydroides simplidentata Pillai, 2009 (additional source)
Hydroides sinensis Zibrowius, 1972 (additional source)
Hydroides spongicola Benedict, 1887 (additional source)