FIG. 5 in A highly derived docodont from the Patagonian Late Cretaceous: evolutionary implications for Gondwanan mammals

FIG. 5. — Molar evolution and cusp homologies in lower right molars of morganucodontids, docodontids, and reigitheriids. Posterior (left) and occlusal (right) views (anterior to the left; lingual below); A, Morganucodon; B, hypothetical Early or Middle Jurassic docodont; C, Docodon from the Late Jurassic Morrison Formation; D, hypothetical Late Jurassic or Early Cretaceous reigitheriid; E, Reigitherium bunodontum from the Campanian-?Maastrichtian La Colonia Formation, Patagonia. In the occlusal views (right), anteri- or is to the right, and lingual face is toward the bottom of the page. Abbreviations: "a", cusp a; a.a.l.c., anterior additional lower cusp; "c", cusp c; cr, crenelation; i.a.l.c., intermedium additional lower cusp; m.i.c.c., main internal cungulum cusp; p.c.c., posteri- or cingulum cusp; p.i.c.c., postero-internal cingulum cusp; p.a.l.c., posterior additional lower cusp; prd, protoconid; s, sulcus. Cusps nomenclature follows Jenkins (1969), except a.a.l.c., i.a.l.c. and p.a.l.c., that are new cusps and only known in Reigitherium bonodontum. Drawings are not to scale.