Editing Synapsida (section)

===Teeth===
[[File:Eothyris head.jpg|thumb|200px|right|''[[Eothyris]]'', an early synapsid with multiple canines]]
Synapsids are characterized by having differentiated teeth. These include the [[Canine tooth|canine]]s, [[molars]], and [[incisor]]s.<ref>Angielczch, Kennenth; Kammerer, Christian F.; Frobisch, Jorg. (2013). ''Early Evolutionary History of Synapsida''. Springer Science & Business Media. {{ISBN|978-94-007-6841-3}}, p. 11</ref> The trend towards differentiation is found in some [[labyrinthodont]]s and early [[anapsida|anapsid]] reptilians in the form of enlargement of the first teeth on the [[maxilla]], forming a sort of protocanines. This trait was subsequently lost in the [[diapsid]] line, but developed further in the synapsids. Early synapsids could have two or even three enlarged "canines", but in the therapsids, the pattern had settled to one canine in each upper jaw half. The lower canines developed later.