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Are scorpions considered crustaceans or arachnids and why?

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Scorpions are arachnids. Arachnids are terrestrial chelicerates. Scorpions are chelicerates by virtue of having chelicera, which are technically a pair of appendages on a body segment in front of the segment that contains the mouth. read more

Scorpions are considered arachnids. Arachnids are a very diverse group consisting of spiders, scorpions, ticks, mites, harvestmen, and more. They all have eight legs and lack antennae. They also have only two body segments: a cephalothorax and an abdomen. read more

In some arachnids, the pedipalps act much like antennae, in others like legs, and in some they have formed claws. So, in short, arachnids are a class of animals that encompasses a huge range of different species. There are an estimated 100,000+ species of arachnids, more than the total estimated number of vertebrates. read more

Crustaceans are mostly aquatic animals - crabs, shrimp, barnacles, and so on. Arachnids are in a different sub-phylum - Chelicerates (spiders and sea spiders and horseshoe crabs), which have two appendages before the mouth (chelicerae). read more

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