Hathrometra sarsi Clark & Clark, 1967 – synonym of Hathrometra sarsii
Hathrometra tenella (Carpenter, 1888) non (Retzius, 1783) – synonym of Hathrometra sarsii
Hippasteria (Nehippasteria) insignis dons, 1938 – synonym of Hippasteria phrygiana
Hippasteria europaea Gray, 1840 – synonym of Hippasteria phrygiana
Hippasteria johnstoni Gray, in Johnston, 1836 – synonym of Hippasteria phrygiana
Hippasteria plana Gray, 1840 – synonym of Hippasteria phrygiana
Holothuria brunneus (W. thomson, 1840, ex Forbes, MS), non Chamisso & Eysenhardt, 1821 – synonym of Ocnus planci
Holothuria drummondii Thompson, 1840 – synonym of Thyonidium drummondii
Holothuria frondosa Gunnerus, 1767 – synonym of Cucumaria frondosa
Holothuria fucicola Forbes & Goodsir, 1839 – synonym of Cucumaria frondosa
Holothuria fusus O.F. Müller, 1776 – synonym of Thyone fusus
Holothuria grandis Forbes & Goodsir, 1839 – synonym of Cucumaria frondosa
Holothuria inhaerens O.F. Müller, 1776 – synonym of Leptosynapta inhaerens
Holothuria lactea Forbes & Goodsir, 1839 – synonym of Ocnus lacteus
Holothuria papillosa Abildgaard, 1789 – synonym of Thyone fusus
Holothuria pellucida Flemming, 1828, non Vahl, 1806 – synonym of Thyonidium hyalinum
Holothuria pentactes Linneaeus, 1767 – synonym of Cucumaria frondosa
Holothuria pentactes O.F. Müller, 1776 – synonym of Cucumaria frondosa
Holothuria phantops Strussenfelt, 1765 – synonym of Psolus phantapus