I've always seen Deelers as ticks due to their lack of a defined abdomen and this goes quite well with the whole "blood curse" thing. Also for some reason my dad thinks ticks fall out of trees so I guess I have just held that in my mind my entire life (apparently they don't? or well at least they don't do it intentionally). But they are most likely spiders due to the webs and art giving them eight legs.
Deelers for the uninformed:













