Spiders (with eight legs, belonging to the order Araneae and the class Arachnida) aren't insects (with six legs, belonging to the class Insecta).
Both belong to the phylum Arthropoda.
Spiders (with eight legs, belonging to the order Araneae and the class Arachnida) aren't insects (with six legs, belonging to the class Insecta).
Both belong to the phylum Arthropoda.