Tensa said:
All spiders are considered bugs.
That's what you missed.
Dear wikipedia:

Spiders
Spiders (order Araneae) are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom. They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms.

Bugs
Specifically, an insect of the order Hemiptera, known as the "true bugs".
Informally, an insect, spider or other small pest excluding rodents; including most arthropods, except marine crustaceans, including individuals or species of
centipede
millipede
mite
tick
woodlouse

This was state the bloody obvious day wasn't it? >_>