Pelvic spur
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Pelvic spurs are external protrusions found around the cloaca in certain superfamilies of snakes belonging to the greater infraorder Alethinophidia. These spurs are made up of the remnants of the femu
External view of anal spurs on a male, albino Burmese python
Skeleton of a Boelens python showing the bones inside the anal spurs
Toxicofera
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Toxicofera is a clade of scaled reptiles that includes the Serpentes, Anguimorpha and Iguania. Toxicofera contains about 4,600 species of extant Squamata. It encompasses all venomous reptile species,
Pelvic spur
…structure. This femur derives from ancestral hind limbs found in the most recent common ancestor of modern snakes and the other reptiles of the clade Toxicofera, many of which have fully functional front and hind limbs. Due to the fact that the spurs derive from the ancestral state of functional legs, but are…
Mexican ridged nosed rattlesnake head