*rubs eyes* Urg, I'm getting sick of having to repeat myself so much...
Okay, no biggie, no hard feelings. We've talked about Elum before. Do a search, you should find something.
EDIT: Here, I did it for you, because it was more fun than doing French coursework. I'm sure there's a bigger discussion on this where Khanz joins in the discussion, but I could be wrong on that. Note also that I'm assuming that any reproduction aside from queens involves sex, although maybe not in a form we understand (of course budding and splitting are not sexual, but I seriously doubt an Elum would produce offspring like that).
EDIT 2: And because I'm so generous I'll actually post the link this time round.
Here you go.