Table of Contents
Are spiders called spiders?
Spiders belong to a group of animals called “arachnids”. Arachnids belong to an even larger group of animals called “arthropods” which also include insects and crustaceans (lobster, crabs, shrimp, and barnacles). This is the largest group in the animal kingdom!
What makes a spider a spider?
Spiders (order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure.
Are spiders insects yes or no?
Spiders are not insects. Spiders, and other species in the Arachnida group, have eight legs with only two body parts as well as eight eyes. A spider’s head and thorax are fused while their abdomen is not segmented. Spiders also do not have distinct wings or antennae like insects.
What do spiders typically have?
Circulation. Spiders,like most arthropods,have an open circulatory system,i.e.,they do not have true blood,or veins which transport it.
What are the characteristics of spiders?
The anatomy of spiders includes many characteristics shared with other arachnids. These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed.
What types of of spiders are there?
Brown Recluse Spider. These spiders are indigenous to the United States,where they are well established in fifteen states.
What are spiders useful for?
The existence of spiders is vital to the earth. Spiders eat many types of harmful insects, helping to keep gardens free of pests. Not only do they help pollinate plants, they also help recycle dead animals and plants back into the earth.