- Hygrosoma aethiopicum Döderlein, 1905 accepted as Hygrosoma hoplacantha (Thomson, 1877)
- Hygrosoma hoplacantha (Thomson, 1877)
- Hygrosoma hoplacanthum (Thomson, 1877) accepted as Hygrosoma hoplacantha (Thomson, 1877)
- Hygrosoma lucentulum (A. Agassiz, 1879) accepted as Hygrosoma luculentum (A. Agassiz, 1879)
- Hygrosoma luculentum (A. Agassiz, 1879)
- Hygrosoma petersi (A. Agassiz, 1880) accepted as Hygrosoma petersii (A. Agassiz, 1880)
- Hygrosoma petersii (A. Agassiz, 1880)
- Hygrosoma uranus (Thomson, 1877) accepted as Tromikosoma uranus (Thomson, 1877)