Definition: Anaptomorphidae are a group of animals that share a common ancestor with reptiles, including snakes, lizards, spiders, and scorpions. They evolved from ancestral tetrapods (trunked vertebrates) before becoming amphibians or mammals, which then diverged into the modern phylum Anura. This group is characterized by having short, flexible limbs that allow them to move easily in water and have no backbone. It also includes some very early examples of mammals, such as the mammoth and the brontosaur, which are more akin to reptiles but still belong to this evolutionary lineage.
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