FIG. 2 in Taurus of the Tidepool? Inferring the Function of Cranial Weapons in Intertidal Sculpins (Pisces: Cottoidea: Oligocottinae)

FIG. 2. Allometric trajectories of three representative oligocottine sculpins. The regression score (vertical axis) represents the axis of maximum variance of allometric shape change of the preopercle and is unique to each species. A TPS transformation grid overlayed on a model of a preopercle that has been warped to show the change in shape illustrates the extremes of variation along that axis. The species illustrated (from top to bottom) are: Artedius lateralis, Oligocottus rubellio, and Leiocottus hirundo. Solid lines indicate a statistically significant relationship between preopercle shape and the standard length of the specimen; dashed line indicates a non-significant relationship (e.g., isometry). Stars and points in each plot represent the symmetric component of the shape of the left and right preopercle for an individual specimen of a given species. The inset preopercles in each graph show the morphology of the left preopercle of a small, medium, and large specimen of each species (respectively, from left to right; each specimen marked by a star). The color of stars, points, and regression lines in each plot represents the allometric trajectory such that green is negative (top graph), purple is positive (middle graph), and dark blue is isometry (bottom graph).