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. 2011 Jun 22;8(1):127–130. doi: 10.1098/rsbl.2011.0460

Figure 1.

Figure 1.

(a) Sauropodomorph taxic diversity (circles) and counts of dinosaur-bearing collections (DBCs, plus symbols) and formations (DBFs, crosses) through 26 Mesozoic stages (names abbreviated), shading indicates division into two phases of standing diversity in the TJK model; (b) clumped taxic diversity data displayed for Triassic–Jurassic and Cretaceous stages showing no clear difference in observed palaeodiversity despite documented end-Jurassic decimation of sauropodomorph ecotypes (t-test statistics: t = −0.044, d.f. = 23.269, p = 0.9652); (c) residual taxic after regression against DBCs shows a clear difference in diversity between the Triassic–Jurassic and Cretaceous intervals (t = 4.933, d.f. = 22.501, p > = 0.0001).