The Class arachnida is a large and diverse group. All arachnids belong to a subphylum (a division of Arthropoda) known as the Chelicerata
Chelicerata
The chelicerae (/kəˈlɪsəriː/) are the mouthparts of the Chelicerata, an arthropod group that includes arachnids, horseshoe crabs, and sea spiders. Commonly referred to as "jaws", chelicerae may be shaped as either articulated fangs, or similarly to pincers.
, of which there are approximately 65,000 described species (~8,000 in North America). They are characterized by having two body regions, a cephalothorax
cephalothorax
The cephalothorax, also called prosoma, is composed of two primary surfaces: a dorsal carapace and a ventral sternum. Most external appendages on the spider are attached to the cephalothorax, including the eyes, chelicerae and other mouthparts, pedipalps and legs.
Arachnida (/əˈræknɪdə/) is a class of joint-legged invertebrate animals (arthropods), in the subphylum Chelicerata. Arachnida includes orders containing spiders (the largest order), scorpions, ticks, mites, harvestmen, and solifuges.
What phylum is Arachnida?
Kingdom: Animalia (the animal kingdom) Phylum: Arthropoda (arthropods) Class: Arachnida (arachnids) Order: Araneae (spiders)
