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Figure 1 | BMC Evolutionary Biology

Figure 1

From: Phylogeny and adaptive evolution of the brain-development gene microcephalin (MCPH1) in cetaceans

Figure 1

Variation in absolute brain size, relative brain size (EQ = encephalization quotient), and body size in cetaceans in a phylogenetic context. Representatives from seven cetacean families are shown and are scaled to body length. EQ and absolute brain size are indicated to the right of each species name by drawings of brains. The width of each brain is proportioned to the value of EQ or brain weight for each species. For scale, EQ of Physeter macrocephalus is 0.58 and of Tursiops truncatus is 4.02. Brain weight of Physeter macrocephalus is 8.00 kg and of Tursiops truncatus is 1.76 kg. Phylogenetic relationships and approximate divergence times are from [42]. For the timescale, dark green = Eocene, light green = Oligocene, orange = Miocene, and yellow = Plio-Pleistocene. EQ and brain weights for all species in our analysis are shown in Supplemental Table S2.

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