Actinacis cognata Oppenheim, 1901 † (original description)
Actinacis perelegans Oppenheim, 1901 † (original description)
Circophyllia darchiardii Oppenheim, 1901 † (additional source)
Cyathoseris (Mycetoseris) Reis, 1898 † accepted as Mycetoseris Reis, 1889 † (new combination reference)
Cyathoseris (Mycetoseris) dinarica Oppenheim, 1901 † accepted as Cyathoseris dinarica Oppenheim, 1901 † (original description)
Cyathoseris dinarica Oppenheim, 1901 † (original description)
Cycloseris brazzanensis Oppenheim, 1901 † (original description)
Heliastraea forojuliensis Oppenheim, 1901 † accepted as Echinopora forojuliensis (Oppenheim, 1901) † (original description)
Hydnophyllia benardellii Oppenheim, 1901 † (original description)
Hydnophyllia prior Oppenheim, 1901 † (original description)
Leptoseris raristella Oppenheim, 1901 † (original description)
Leptoseris undata Prever, 1821 † (original description)
Mesomorpha columnaris Oppenheim, 1901 † accepted as Siderofungia columnaris (Oppenheim, 1901) † (original description)
Stephanosmilia dachiardii Oppenheim, 1901 † (original description)
Trochoseris dachiardii Oppenheim, 1901 † (original description)

 Classification

 for Millepora coriacea Linnaeus, 1767

the name of the hydrocoral genus Millepora has erroneously been used for algae [details]

 Classification

 for Millepora informis Lamarck, 1816

the name of the hydrocoral genus Millepora has erroneously been used for algae [details]

 Type locality

 for Melanatria peneckei Oppenheim, 1901 †

Guttaring (Sonnberg), Carinthia, Austria; Thanetian, late Paleocene (?) [details]

 Type locality

 for Melania majevitzae Oppenheim, 1901 †

Miladići (Šibošnica brook) ("Šibošnica Rjeka"), Federacija Bosna i Hercegovina, Bosnia and Herzegovina; ... [details]