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. 2009 Feb 4;4(2):e4366. doi: 10.1371/journal.pone.0004366

Figure 12. Proportion-adjusted skeletal profiles of middle and late Eocene archaeocete whales Maiacetus inuus and Dorudon atrox, respectively.

Figure 12

(A)—Maiacetus inuus, a semiaquatic foot-powered swimmer from the Middle Eocene. (B)—Dorudon atrox, a fully-aquatic tail-powered swimmer from the Late Eocene. Baseline is mean length of anterior thoracic vertebrae (stippled box). Sacral vertebrae are enclosed in a second stippled box where sacrals can be identified (e.g., by co-ossification). Maiacetus has a profile more like that of mammals capable of supporting their weight on land, whereas Dorudon has the profile of a modern whale. Interpretation of profiles and the method of median serial-multiple-regression estimation of body weights is explained in [50]. Abbreviations: TCNDSFB, longest tooth length, condylobasal cranium length, narial position, dentary length, symphysis position, mandibular foramen height; and bulla length, respectively; SHRC, scapula, humerus, radius, and Mc-III lengths, respectively; IFTT, innominate, femur, tibia, and Mt-III lengths, respectively.