From The Heretic Knowledge Vault
There is some confusion between Race and Species in both the story and the wiki.
Normally, the taxonomy goes Species->Race, with a race being a subset of the Species. In Errant Story, Race and Species are used almost interchangably. The many Races of the Story are actually separate species but they've been called Races from the begining and it's too late to change now. So while Elves are one of the three major known Races, the Elven Race, as opposed to Trollish Race, is itself composed of multiple races.