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Fig. 5. (Ai) Plot of worm movement, crack extension and pharynx thickness over time
for a representative worm. The position of the anterior end of the worm's head
and the tip of the crack and the thickness of the pharynx (lateral view) were
recorded from video frames at 3.75 frames s–1. In one
burrowing cycle, the worm begins to move forward, extending the crack, then
everts its pharynx. Before the pharynx is fully everted, the worm's head and
the crack tip reach the most anterior point, then the anterior end of the
pharynx moves back as the pharynx everts completely. The worm then moves
laterally within the crack (not shown) with little anterior movement before
beginning to move forward again to repeat the cycle. (Aii) One pharynx
eversion shown in greater detail. (B) Sequence of images from one pharynx
eversion as indicated by corresponding labels on Aii. For each row, the left
image is a lateral view (from camera 1, y–z plane)
showing the stress fields, the center image is a thresholded copy of the left
image, and the right image is the corresponding image from the dorsal view
(from camera 2, x–z plane). Because the cameras were
not run from the same computer, the images from the two cameras are nearly,
but not perfectly, synchronous. Scale bar, 0.005 m.
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