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A 'crurotarsal' ankle is one which can bend between the astragalus and calcaneum.^[1] Crocodilians and therian mammals (marsupials and placentals) have crurotarsal ankles, but these work in very different ways:


★ In the therian crurotarsal ankle, the main joint bends between the tibia and astragalus; the calcaneum has no contact with the tibia but forms a heel to which muscles can attach.




★ In the crocodilian crurotarsal ankle, the astragalus is fixed to the tibia by a suture and the joint bends around a peg on the astragalus which fits into a socket in the calcaneum.

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References

References

1. Glossary: crurotarsal - Palaeos