Wood Warbler is Phylloscopus sibilatrix... or Phylloscopus sibilator???? (1 Viewer)

Sibilatrix is the female of sibilator (in latin).....
The protonym of Phylloscopus sibilatrix was Motacilla sibilatrix.....
Motacilla is female.....
When the genus (of Wood Warbler) was changed to Phylloscopus, "sibilatrix" ...no changed!!!!

The correct name should be Phylloscopus sibilator....what do you think?

H&M4 lists sibilatrix as invariable (but now places Wood Warbler in Rhadina F).

Words in -ator/-atrix usually are nouns formed from verbs (not adjectives). Thus in principle:

- sibilo = to whistle,
- sibilator = he who whistles (masculine noun),
- sibilatrix = she who whistles (feminine noun),
- sibilans = whistling (present participle of sibilo).

A noun in apposition to another noun needs not agree in gender with this other noun (in many cases, agreement would simply be impossible, as no form of the required gender exists).
The present participle (sibilans), if used in a Latin text to qualify a noun, would agree in gender with this noun; however, only the accusative singular varies with gender (masc/fem: sibilantem; neuter: sibilans), and nomenclature only uses the nominative, hence for our purposes the word is invariable.