Arthropod groups: how are they related?

Arthropods are a diverse group of animals with over a million described species and an estimated 6 to 7 million in total. They have a hard exoskeleton, segmented bodies, and an open circulatory system. Arthropod phylogeny is a volatile scientific topic, and opinions keep changing. Arthropods are almost universally considered monophyletic. There are currently two […]

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