Shroomy
Adventurer
Depends on how you count... There is Elf, Eladrin, Drow, Half-elf. Then there is Sun Elf, Moon Elf, Wild Elf, Wood Elf (respectively eladrin and elf variants). Then there are Revenant elves of all sorts. Then there is the short tricksy elves who call themselves gnomes, and the even shorter elves with wings, who call themselves pixies. If the tree hugging elf trope is not enough for you there is also now the tree hugger elf supreme, the Hamadryad, and the elf who grew barkskin and became the mobile tree, the Wilden. And while it's not a race per se, we can have vampire elves of all sorts, not to mention gypsy elves, and shadow elves, and christmas elves. You even have to be an elf to become a Sith Lord (though they use the elven spelling, Sidhe). I think we pretty much have elves coming out of our ears.
And here I thought humans were supposed to be the most diverse race... They are all turning werewolf these days. Yawn. At least their skin doesn't sparkle.
Aquatic elves have been mentioned in 4e sources, but not officially stated, and lets not forget the dusk elf or winterkin eladrin.