The tick is an aracnid. It is a superlarge, blood sucking mite, and mites are not insects.
Mites are aracnids.
It also has 2 body sections, not 3. In fact, it's an arachnid. I originaly found this out from an arachnid mailing list. I also have a book that talks about all the arachnids in the U.S., and ticks are in there. The Madagascar Hissing Cockroach is an excellent insect to feed to trantulas.