Fig. 8. Increase in the volume of the bucco-pharyngeal cavity during suction feeding calculated using ellipse models (see also Fig. 5). The 100% relative time (x-axis) corresponds to one frame after maximal volume. All models are scaled to a length of 25 mm. In addition to the total volume increase (ventral and lateral expansion), also the volume increase due to only ventral expansion is shown (legend above graphs). Shaded areas indicate standard errors. The arrows indicate the volume increase due to lateral expansion.