FIGURE 1. Protypotherium antiquum, lectotype ZMK 21 in Identification of type materials of the species of Protypotherium Ameghino, 1885 and Patriarchus Ameghino, 1889 (Notoungulata: Interatheriidae) erected by Florentino Ameghino

FIGURE 1. Protypotherium antiquum, lectotype ZMK 21/1877, right mandibular fragment with p4-m3, in labial (A) and occlusal (B) views; reproductions of figures 1 (C) and 1a (D) from Ameghino (1889, plate 15); and MACN-A 1288, cast of lectotype, in labial (E) and occlusal (F) views. Protypotherium australe, MACN-A 1338, cast of the holotype, in occlusal view (G). Protypotherium praerutilum, holotype MACN-A 1081, incomplete skull, in ventral (H) and dorsal (I) views; holotype MACN-A 1082, incomplete mandible, in lateral (J) and occlusal (K) views; reproductions of figures 6 (L) and 6a (M) from Ameghino (1889, plate 14); reproductions of figures 7 (N) and 7a (O) from Ameghino (1889, plate 14). Scale bar = 10 mm.