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Figure 4 | EvoDevo

Figure 4

From: Revisiting de Beer’s textbook example of heterochrony and jaw elongation in fish: calmodulin expression reflects heterochronic growth, and underlies morphological innovation in the jaws of belonoid fishes

Figure 4

The toothless extensions form the basis for heterochronic shifts in jaw growth amongst the Belonoidei. Allometric plots displaying ratios between upper and lower jaw growth for (A) medaka, (B) halfbeak, and (C) needlefish as well as ratios between upper and lower jaw excluding the toothless extensions for (B) halfbeak and (C) needlefish. (A) The jaws of medaka, which display the ancestral condition, undergo isometric growth (represented by the dashed line). (B) Comparison between upper and lower jaw growth for halfbeak indicates growth acceleration in favour of the lower jaw, while comparison between upper and lower jaw excluding the toothless extensions indicates isometric growth (represented by the dashed line). (C) A similar pattern to halfbeak is observed in needlefish. Note, needlefish growth trajectory is based on only the data points prior to growth acceleration of the upper jaw.

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