| Junior homonym (nom. illeg.: nom. praeocc.) [ICZN] | |
Ref:
S.A. Neave (ed.), [2005]. Nomencl. Zool.: [19 Dec 2008].
[implicit] |
| Nomen nudum (nom. nud.) [ICZN, 1999: Arts. 12 [before 1931], 13 [after 1930], G] | |
Ref: Cleevely, R.J. & Morris, N.J. 1988. Taxonomy and ecology of Cretaceous Cassiopidae (Mesogastropoda): 242. |