While it may very well have been a parasite, the creature was clearly an arachnid - it had 8 legs, and had a markedly different body than a Shadow Insect.
It might also be a giant mite/tick - it certainly looks like one.
- I'm relatively certain that the parasitic arachnid on Ook came from the Twilight Realm, even if it is not a Shadow Insect. Doesn't it burst into the Twilight squares+red lines once it is destroyed? -Bodo, Sage of Obsession 04:09, 6 July 2009 (UTC)