Tel'Quessir are a number of closely related, long lived fey races commonly known as elves, though this term is now acknowledged to be techically inaccurate. Nonetheless, the name is common and many of the Tel'Quessir consider themselves as one larger culture, an attitude not unjustified given that nearly all Tel'Quessir speak elven and share a common history together. Perhaps more importantly, the Tel'Quessir were once one race, generally assumed to have been the eladrin or "high elves."
For these reasons and others, the Tel'Quessir are often considered as though they were one race and called "elves."
There are several other sub-races of Tel'Quessir as well, and it's not clear if they fit neatly into one of the above three sub-categories. They include:
While not strictly a sub-race of Tel'Quessir, the result of a human and Tel'Quessir mating is a half-elf, half-eladrin, or half-drow, whereas the offspring of a Tel'Quessir and a fiend is called a fey'ri.
Elven Races: L-R: human, sun elf, wood elf, moon elf, drow, wild ef