Fig. 5: Morphological disparity in relation to evolutionary rates and species richness among tribes.
From: Evolution of the bovid cranium: morphological diversification under allometric constraint

a Disparity and rates of morphological change are strongly correlated (though the pairwise differences among tribes are largely nonsignificant, see the text). However, neither disparity nor rates are significantly correlated with clade richness (b, c), implying that cranial shape is not a major determinant of speciation in bovids.