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Fig. 8. Worm thickness for different models and real worms (black). All five models have an applied pharynx stress of 378 Pa. Model 1 (blue dotted line) has constant body stress of 92 Pa, model 2 (green dotted line) has body stress linearly decreasing from 92 to 60 Pa, model 3 (red dotted line) has constant body stress corrected for the lateral constraints to 64 Pa, model 4 (cyan dotted line) has body stress corrected for the lateral constraints to 64 linearly decreasing to 42 Pa. In models 1–4, pharynx stress is applied from the crack tip to 0.00725 m, resulting in a pharynx displacement equal to the average pharynx length observed, 0.00667 m. Model 5 (green broken line) has the same stresses as model 2, but the pharynx stress extends to 0.00839 m, resulting in pharynx displacement equal to the maximum pharynx length observed, 0.00779 m (Table 3).

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