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Fig. 11 | BMC Evolutionary Biology

Fig. 11

From: The multi-peak adaptive landscape of crocodylomorph body size evolution

Fig. 11

Distribution of regime shifts represented by the difference between descendant and ancestral regimes trait optima values (θ) plotted against the θ of the ancestral regime. Large red circles represent shifts that led to clades containing multiple taxa, while smaller pink circles represent “singleton” regimes, containing only a single taxon. Vertical dashed line indicates the ancestral regime for all crocodylomorphs (Z0), while horizontal dashed line can be used as a reference to identify regime shifts giving rise to larger (circles above the line) or smaller-bodied (circles below the line) descendants. Circles at the exact same position (i.e., shifts with the same θ values for both ancestral and descendant regimes) were slightly displaced in relation to one another to enable visualization. This plot was constructed using the θ values from trees with different positions of Thalattosuchia: a Tree number 2, with Thalattosuchia within Neosuchia; b Tree number 17, with Thalattosuchia as the sister group of Crocodyliformes; c Tree number 18, with Thalattosuchia as the sister group of Mesoeucrocodylia. θ values in log10 mm, relative to the cranial measurement ODCL (orbito-cranial dorsal length)

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