It's dragonfly LOL.

We do have mosquito (or at least mosquito-like) monster in FFXIV though and they're annoying as hell.

As for the NMs which drop useful gear, there are many, but yes most of them are 30+. So I would suggest crafted gear or NPC store-bought gear until you're in that range. There's a Nighthawk Visor that's a head equipment lv 20, though. I've been using that since I was 20, and now still using it on many of my classes. You might want to bring a bunch of friend if you want to get it early. NM Nest Commander can be a handful.