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Body Size Distribution of the Dinosaurs

Figure 5

Frequency distribution of dinosaur species body size for six major time periods: (a) Late Triassic; (b) Early Jurassic; (c) Middle Jurassic; (d) Late Jurassic; (e) Early Cretaceous; and (f) Late Cretaceous.

The Early and Middle Jurassic were best fitted by unimodal distributions; the Early Cretaceous by a bimodal distribution. The Late Triassic, Jurassic and Cretaceous were all best fitted by negatively-skewed multi-modal distributions (see Table 2).

Figure 5

doi: https://doi.org/10.1371/journal.pone.0051925.g005