Arthropods
Home of the spider, beetle, and every other living insect, they are the largest phylum in the animal kingdom. All together, they make up over 3/4ths of all living beings on Earth, and the vast amount of species have conquered land, air, and water. They are characterized by their limbs being combined, like insects with their appendages.
Their typical body make up consists of appendages, each one with a dedicated function such as locomotion or internal organs. In a spider, one of their appendages is solely for the production of silk.
Their typical body make up consists of appendages, each one with a dedicated function such as locomotion or internal organs. In a spider, one of their appendages is solely for the production of silk.
A spider's nervous system is one of the more complex ones in the Arthropoda phylum, as it's nervous sytem is housed right between it's stomach pumps and legs. Because of the Anthropoda's general body make-up, the nervous system is in the main appendage while the rest of it's organs are stored in it's final appendage.
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A horseshoe crab is fairly similar to ours, with a few differences. The crab has one main nerve that runs from the brain towards the tail, and in it is information regarding movement and nearby objects. It has a few other organs and nerves that are related to optics and sensory fibers that are distributed throughout the body, even to the heart!
A surprising group of insects in the Arthropod group are butterflies. Since their original form before evolving into one is a caterpillar, there are classified as one. There nervous system is much more complex than one of a horseshoe crab due to how their sensory organs operate. The network of fibers all along it's body, wings, and antennae are all interconnected and run separately from the brain. It's vision is fairly bad, and only has one optic nerve running from the brain to both eyes.
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