Every Time Something Has Evolved Into A Snake
Summary
This episode explores "serpentization," the evolutionary phenomenon where multiple unrelated animal groups independently develop snake-like bodies. The host discusses extinct Carboniferous creatures like Aestopoda and Microsaurids, alongside modern examples such as limbless skinks, glass lizards, and snake lizards. The discussion highlights how these animals converge on similar traits like elongated bodies and reduced limbs to exploit specific ecological niches, while also noting that mammals like weasels show early signs of similar adaptations.
Topics discussed
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Why snakes are evolutionarily successful
The concept of serpentization
Aistopoda: Ancient snake-like reptiles
Microsaurs and other Carboniferous snake-likes
Advantages of a snake-like body plan
The gap in serpentization history
Sicilians: Limbless amphibians
Squamates and the 25 independent losses of limbs
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Why squamates are prone to limb loss
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Snakes and the Parvi-Raptora debate
Legless skinks
Cordylidae and Kamehasaura
Snake lizards (Pygopodiidae)
Glass snakes (Anguinae)
Amphisbaenians: Worm-like lizards
Weasels as snake-like mammals
Sea snakes and conclusion
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