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Re: -i? -orum? ACK!

A species name ends in -i when it is named after a male person, or perhaps if
you wish to honor a company (which are assumed to be of masculine gender for
purposes of taxonomy).

Companies? Masculine???

A name may also end in -ii, and there's no real problem
with this, since it's usually done through a process of latinization of the
honored's name before adding the final -i, so that Linné (properly, Linnaeus)
would be stemmed as linnaei-, then add -i for *linnaeii*.

Outright wrong in this case. The stem of Linnaeus is Linnaeo-, therefore the genitive is Linnaei. This can become a specific epithet (in lower case, of course).

Some also tend to
change the final vowel of a name into an -i- then add -i, as in *conybearii*.

Back in those times people often preferred to Latinize names before giving them a Latin genitive. So Mr Conybeare became Conybearius; the i is just there because it sounds better (...well, marginally...). The stem of this construct is then Conybeario-, and the genitive Conybearii.

A species can also end in -ianus as genitive forms of their names, or of
companies, or of regions. Names like *copeanus*, *fraasianus*, or *zhaoianus*.

This is not a genitive. It turns nouns into adjectives. For this purpose it has been imported into English: Australian, Floridian...

Prior to 2000, the ICZN mandated change of all species epithets named for
people to agree in number and gender. So if it was a group the name was derived
from, an automatic change was requested. However, after 2000, this changed, and
no names, even if they occured before 2000, were mandated and in fact they were
stated to be preferred as the print name even if they were later to be
"emmended." *Bambiraptor feinbergi*, named for the husband and wife Feinbergs,
was named in 2000, and any correction to the name is in violation of the ICZN

I'll have to look up if you aren't confusing something here...

[...] no one says you HAVE to use the ICZN.

At present, though, the ICZN is the only existing body of rules for the scientific names of "animals". Phylogenetic nomenclature for species doesn't exist yet.