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Fig. 18 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 18. Comparison of the lateral skull profile of the cetotheriid baleen whales Piscobalaena nana (redrawn from Bouetel and Muizon 2006, inverted) and Cetotherium riabinini. The images are aligned based on triangles connecting the exoccipital-petrotympanic-squamosal, squamosal-parietal-supraoccipital and supraoccipital-parietal (interparietal) sutures. Not to scale.

Fig. 6 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 6. Neurocranium of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in dorsal (A) and ventral (B) views. Photographs (A , B ), explanatory drawings (A , B ).

Fig. 8 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 8. Alisphenoid and adjoining bones of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in anterolateral and slightly ventral view.

Fig. 15 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 15. Ribs of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in right lateral view; x denotes actually preserved (as opposed to remodelled) bones.

Fig. 1 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 1. Map of the Black Sea region showing the type localities of Cetotherium riabinini and Cetotherium rathkii.

Fig. 2 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 2. Mounted skeleton of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in lateral view.

Fig. 14 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 14. Caudal vertebrae of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in dorsal (A) and lateral (B, C) views.

Fig. 11 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 11. Cross sections of the right mandible of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, located 10–80 cm posterior to the distal end of the bone. For each cross section, the medial margin of the mandible is on the right.

Fig. 4 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 4. Comparison of the cetotheriid baleen whales Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1 (A) and Cetotherium rathkii Brandt, 1843, south coast of Taman Peninsula, Tortonian, Late Miocene, PIN 1840/1 (B). Nasals, dorsal view (A1, B1); squamosal, lateral view (A2, B2); squamosal, posterior view (A3, B3); palatines, ventral view (A4, B4). Arrows indicate diagnostic differences.

Fig. 5 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 5. Skull of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in dorsal (A), ventral (B, dashed lines indicate areas obscured by the mandibles), and lateral (C) views.

Fig. 7 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 7. Neurocranium of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in lateral A), posterodorsal (B), and posterior (C) views. Photographs (A1, B), explanatory drawings (A2, C).

Fig. 13 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 13. Vertebrae forming part of the torso (sensu Buchholtz 2001) of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in dorsal (A) and lateral (B) views.

Fig. 10 in The anatomy of the Late Miocene baleen whale Cetotherium riabinini from Ukraine

Fig. 10. Proximal portion of the right mandible of the cetotheriid baleen whale Cetotherium riabinini Hofstein, 1948, Late Miocene of Nikolaev, Ukraine, NMNH-P 668/1, in lateral (A), dorsomedial (B), and posterior (C) views.

Fig. 3 in Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology

Fig. 3. Late Miocene capybara Cardiatherium paranense (Ameghino, 1883a), MLP 87-XI-1-3a, from Paraná River cliffs, Huayquerian SALMA, in ventral (A, B) and left lateral (C, anterior to left) views. A. Skull measurements. B. Skull landmarks: 1, posterior limit of anterior root of the zygomatic arch; 2, lateralmost point of prism I of P4, measured on the alveolar rim; 3, anteriormost point of scar marking the origin of the masseter superficialis muscle; 4, anterior limit of anterior root of the zygomatic arch; 5, midpoint of posterior margin of incisive foramen; 6, midpoint between both P4s at the level of prism I on the maxillary suture. C. Skull landmarks: 1, posterior end of incisive foramen; 2, anterior limit of anterior root of the zygomatic arch; 3, posterior limit of anterior root of the zygomatic arch; 4, point between M1 and M2 on the alveolar plane; 5, point between P4 and M1 on the alveolar plane; 6, point in front of P4 on the alveolar plane; α, angle formed by the anterior root of the zygomatic arch and the alveolar margin of the cheek teeth in lateral view.

Fig. 2 in Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology

Fig. 2. Tooth nomenclature (A), measurements (B), and landmarks (1–8)/ semilandmarks (small circles) (C) on right P4 of Cardiatherium paranense Ameghino, 1883a). 1, labial end of prism I; 2, lingual end of prism I; 3, maximum depth of fundamental internal flexus; 4, lingual end of prism II; 5, labial end of prism II; 6, maximum depth of primary external flexus; 7, labialmost point of isthmus; 8, maximum depth of secondary external flexus.

Fig. 6 in Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology

Fig. 6. Occlusal view of the right upper teeth of Late Miocene capybaras Cardiatherium paranense (Ameghino, 1883a) (A–L) and C. aff. orientalis (M, N). C–E, H, N, reversed. A. MACN 3353, M3. B. MLP 71-VI-16-1, P4–M2. C. MLP 69-XII-2-19, P4–M1. D. MLP 87-XI-1-2, M3. E. MLP 40-XI-15- 2, P4–M3. F. MLP 87-XI-1-3, P4–M1. G. MLP 41-XII-13-153, P4–M3. H. MLP 87-XI-1-1, P4–M1. I. MLP 87-XI-1-3a, P4–M2. J. MLP 87-XI-1-27, P4–M3. K. MACN 13434, P4–M1. L. MLP 41-XII-13-161, M3. M. GHUNLPam 5236, P4–M1. N. GHUNLPam 14452, P4–M3.

Fig. 7 in Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology

Fig. 7. Late Miocene capybara Cardiatherium aff. orientalis Pascual and Bondesio, 1982, GHUNLPam 14452 from Laguna Chillhué, Huayquerian SALMA, in ventral (A) and lateral (B) views (anterior to the left). Dotted area, sediment.

Fig. 5 in Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology

Fig. 5. Late Miocene capybara Cardiatherium paranense (Ameghino, 1883a), MLP 87-XI-1-27, holotype of Anatochoerus inusitatus Vucetich and Mones in Mones, 1991 from Paraná River cliffs, Huayquerian SAL- MA, in ventral (A), lateral (B), and dorsal (C) views.

Fig. 4 in Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology

Fig. 4. Late Miocene capybara Cardiatherium paranense (Ameghino, 1883a). A. MLP 87-XI-1-27, holotype of Anatochoerus inusitatus Vucetich and Mones in Mones, 1991, Río Paraná cliffs. B. MLP 71-VI-16-1, juvenile specimen, Tupungato. In ventral (A , B ), lateral (A , B ), and dorsal (A , B ) views.

Fig. 1 in Late Miocene capybaras from Argentina: Skull anatomy, taxonomy, evolution, and biochronology

Fig. 1. Map showing the localities mentioned in the text. 1, Paraná, Entre Ríos Province; 2, Laguna Guatraché and Laguna Chillhué, La Pampa Province; 3, Arroyo Chasicó, Buenos Aires Province; 4, Albardón, San Juan Province; 5, Rincón Chico, Chubut Province; 6, Tupungato, Mendoza Province; 7, Barrancas de San Gregorio, San José, Uruguay.