On a few embryonic structures forming evolutionary connections between the two Sauropsida classes (morphogenesis of the nasal capsule, the epithelial nasal tube and the organ of Jacobson in Sauropsida XVI).
D000818:Animals; D001717:Birds / Q000033:anatomy & histology; D008116:Lizards / Q000196:embryology*; D009666:Nose / Q000196:embryology*; D010802:Phylogeny