- Hemiaster (Integraster) gibbosus A. Agassiz, 1879 accepted as Holanthus expergitus gibbosus (A. Agassiz, 1879)
- Hemiaster expergitus Lovén, 1871 accepted as Holanthus expergitus (Lovén, 1871)
- Hemiaster gibbosus A. Agassiz, 1879 accepted as Holanthus expergitus gibbosus (A. Agassiz, 1879)
- Hemiaster mentzi A. Agassiz, 1880 accepted as Holanthus expergitus (Lovén, 1871)
- Hemiaster tenuis (A. Agassiz, 1898) accepted as Holanthus tenuis (A. Agassiz, 1898)
- Holanthus expergitus (Lovén, 1871)
- Holanthus expergitus gibbosus (A. Agassiz, 1879)
- Holanthus tenuis (A. Agassiz, 1898)
- Kupeia toi McKnight, 1974