How many legs does a spider have?

Spiders:

1. Spiders belong to the class of arachnids.
2. All arachnids, have eight legs.
3. Though spider falls under the phylum of Arthropoda, which has only 6 legs the spiders have 8 legs.
4. Spiders fall under the phylum Arthropoda and hence are related to crabs and prawns.