The thyroid of the sarcopterygian fishes (Dipnoi and Crossopterygii) and the origin of the tetrapod thyroid.
D000818:Animals; D005075:Biological Evolution; D002467:Cell Nucleus / Q000648:ultrastructure; D004847:Epithelial Cells; D005399:Fishes / Q000033:anatomy & histology*; D013045:Species Specificity; D013961:Thyroid Gland / Q000033:anatomy & histology*