Figure 4
Phylogenetic generalized least squares (pGLS) regression of the (A) olfactory bulb mass (C) telencephalon mass, (E) diencephalon mass, (G) optic tectum mass, (I) tegmentum mass, (K) cerebellum mass, and (M) medulla mass with total brain mass across 84 species of cartilaginous fishes, indicating the relative size of major brain regions for Somniosus microcephalus and S. pacificus as compared to members of the Somniosidae (black circles), Oxynotidae (dark grey circles), and other species of sharks and holocephalans (light grey circles). Model results available in Table 2. Phylogenetically corrected residuals predicted from total brain mass for the (B) olfactory bulbs (D) telencephalon, (F) diencephalon, (H) optic tectum, (J) tegmentum, (L) cerebellum, and (N) medulla are presented for Somniosus microcephalus, S. pacificus, and nine other species for comparison.
