From: Forelimb-hindlimb developmental timing changes across tetrapod phylogeny
Forelimb event | Hindlimb event |
---|---|
External Form | |
A. bud first distinct | K. bud first distinct |
B. AER appears | L. AER appears |
C. digital plate crenation (fossae separating digits dorsally) | M. digital plate crenation (fossae separating digits dorsally) |
Chondrogenesis | |
D. humerus appears | N. femur appears |
E. ulna appears | O. fibula appears |
F. proximal carpal (ulnare) appears | P. proximal tarsal (fibulare) appears |
G. carpal distal to ulnare appears | Q. tarsal distal to fibulare appears |
H. metacarpal appears | R. metatarsal appears |
I. proximal phalanx appears | S. proximal phalanx appears |
J. distal phalanx appears | T. distal phalanx appears |