Visualisation of osteocyte lacuna densities in different tetrapods.

<p>A. Plot of osteocyte lacunar density on body mass of different taxa on a double logarithmic scale. Lines are the phylogenetic controlled regression lines of the respective taxonomic group. Solid lines represent significant regression models. The scattered line represents a regression model where the slope is not significant different from zero using a significant level of 0.05. For details of the regression models see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0077109#pone-0077109-t003" target="_blank">Table 3</a>. black circles = mammals, red circles = sauropodomorphs, blue open squares = amphibians, yellow squares = theropods, orange triangles = birds, green circles = reptiles, cross = diadectomorphs, star/pentagram = pterosaurs, square with triangle = “pelycosaurs”. <b>B</b>. Studied species in comparison to the mammal regression model (solid line). Scattered lines are 95% prediction intervals of the mammal regression model. Symbols as in <b>A</b>.