For example, Lindholm discovered in 1913[2] that a generic name Jelskia established by Bourguignat in 1877 for a European freshwater snail could not be used because another author Taczanowski had proposed the same name in 1871 for a spider.
This is an objective synonym of Jelskia Bourguignat, 1877, because he has the same type species, and is used today as Borysthenia.
The Italian snail is known until today under the name Solatopupa psarolena (Bourguignat, 1859).
The International Code of Zoological Nomenclature prescribes that for a new replacement name, an expressed statement must be given by the author,[4] which means an explicit statement concerning the process of replacing the previous name.
It is not necessary to employ the term nomen novum, but something must be expressed concerning the act of substituting a name.
So the name P. angolana was made available at this occasion, and is an objective synonym of P. brasiliensis.
[5] For species, replacement names may be needed because the specific epithet is not available in the genus for whatever reason.