Although spiders are classified as both arthropods and arachnids, neither of those is the family name. Arthropoda is the phylum to which spiders belong, while arachnid is the class. No one family exists to which all spiders belong.
At least 112 spider families in the order Araneae (true spiders) have been identified. The arrangement of a spider's eyes is one characteristic that determines its family. Arachnids have a two-part body, eight legs and no antennae. Other creatures in this class are scorpions, mites and ticks. Arthropods are invertebrates with a segmented body and jointed legs. This phylum includes insects and arachnids.Learn More
By eating the bugs that can destroy crops, spiders serve an important function in many ecosystems. Spiders are also prey for other animals, further adding to their ecological importance, and spider silk is potentially useful to humans as a material.Full Answer >
Arthropods excrete waste through special structures known as Malpighian tubules, which are extensions of the digestive tract. Terrestrial arthropods excrete their waste as solid uric acid, just as birds do, which requires no water and thus preserves precious moisture.Full Answer >
All spiders have eight legs. Like insects, which have six legs, spiders belong to the phylum Arthropoda but are members of a different class, Arachnida.Full Answer >
Diving bell spiders of the species Argyroneta aquatica have the ability to swim, and they use this adaptation to live underwater. Although they live and swim in the water, diving bell spiders still breathe air by creating air pockets underwater that they use as homes.Full Answer >