By Maddie Rosen
Source: http://tiktaalik.uchicago.edu/book-tools.html
Hands, Hands Everywhere!27 bones34 muscles48 nerves
Source: http://www.presentationgroup.com/medicallibrary/
Manufacturing LimbsRecipe for a limb:
One Bone upperTwo Bones lowerNine bone wristFive finger rods
Exceptional Similarities
Source: http://tiktaalik.uchicago.edu/book-tools.html
Origin of LimbsLepidosiren
paradoxaEusthenopteronIchthyostegaAcanthostega
gunnari
Source: http://tiktaalik.uchicago.edu/book-tools.html
TiktaalikFin with Owen’s
patternEnvironment
Source: http://tiktaalik.uchicago.edu/book-tools.html
DiscussionWhy do you think a limb is set up the way it is? If
you were to create a limb would you use more or less bones? Which areas of the arm would you change?
What do you think Tiktaalik used its advanced arms for? Do you think it was mostly a mud-dwelling or water-dwelling animal? Why?
What do you think lead to the change in lifestyle from fish to Tiktaalik?
Why do you think we evolved to be land dwelling creatures and not an intermediate like Tiktaalik?