Fig. 15. Morphometric comparison of Odontostilbe microcephala and O. weitzmani. (a) Density plot with the overlap of the variable M17 (horizontal orbit diameter), that best discriminates the two species. (b) Scatterplot of the polar coordinates obtained for both species using variables M17 and M6 (orbit to dorsal-fin origin); the arrows show the vector of variables. (c) Bivariate randomization test, showing the individual (red point) with a higher probability of belonging to O. weitzmani among all included individuals identified as O. microcephala. (d) Bivariate randomization test, showing the individual (red point) with a higher probability of belonging to O. microcephala among all individuals identified as O. weitzmani.