Priority the dating of scientific names in ornithology
Linnaeus published the 10th edition of the Systema Naturae and in it consistently used his system of binomial nomenclature.
This system was adopted by other naturalists but with no rules governing it so that by the middle of the 19th century there was confusion.
The confusion was increased by the proliferation of new species resulting from the growth of Science and the voyages of exploration.
Hugh Strickland presented a Code of nomenclature to the British Association for the Advancement of Science (Charles Darwin was on its committee).
In practice, a name is rarely used at so many ranks.
For instance, within the subfamily Formicinae is the tribe Camponotini; this name is not use at the subfamily rank because it was established later than the name Formicinae.
In the late 19th century specimens were often labelled as types merely because they were typical of the species.
However, in its modern meaning a type is not necessary typical of the taxon it represents.