ICZN. (1998). Opinion 1903. Umbellula Cuvier, [1797] (Cnidaria, Anthozoa): conserved as the correct original spelling, and corrections made to the entries relating to Umbellularia Lamarck, 1801 on the Official Lists and Indexes of Names in Zoology.
Bulletin of Zoological Nomenclature. 55(3), 187-188.