Legless lizard embryos have hind limb buds

As I discussed in a previous post, molecular phylogenetics suggests that many lizards evolved to become legless over time. One might wonder if there is any evidence of this legged ancestry during their development. In fact, at least some legless lizards possess limb buds as embryos. One particular example comes from the sheltopusik (Ophisaurus adopus), a legless …

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