Fig. 6.

Torsional roll of a burrowing C. elegans. (A) Stereoscopic images of a wild-type C. elegans burrowing in gelatin (image reprinted from ref. 33). (B) A matching time-lapse set of simulated postures of a nematode performing a three-mode torsional roll, Eq. 5. The simulation parameters are curvature amplitude $A/q=1$, worm length $qL=10.2$, torsion ${\tau }_0/q=0.15$, and torsional-mode length $q\mathrm{\Delta }{s}^{\tau }=6$. Similar to the experimental images, the calculated postures are equally spaced in time. The region of nonzero torsion is shaded in blue.