Figure S3 from The earliest record of Caribbean frogs: a fossil coquí from Puerto Rico

Linear regression (R function) of snout–urostyle length (SUL) on humeral head width (both variables natural log-transformed) for extant representatives of subgenera of Eleutherodactylus. The coefficient of determination (r2) is high 0.934 (adjusted r2 = 0.93; P < 0.0001; F1,22 = 310.4) of the resulting relationship (lnSUL = 3.31925 + 0.8883971[lnHHW]) allows us to estimate SUL for LACM 162445 as ~36 mm (star plotted at lnSUL = 3.58), based on humeral head width of 1.34 mm.