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Re: Pterosaur Tibiotarsus
The estruture of Tibiotarsus e formed by:
tibia + proximal tarsals
tibia + proximal and distal tarsals
why in almost papers we can see astragalus+calcaneous named as the
proximal tarsal series and in others as the distal ones.
When the tibia and the proximal tarsals fuse, we call the result the
Proximal tarsals = astragalus + calcaneum*. These are called proximal
because they are proximal = closer to the mass of the body than the distal
ones. What exactly is your question?
* Except in mammals, where it's called calcaneus...