Movie 3

Thoracophelia mucronata burrowing in a shallow petri dish of cryolite with chaetal-body wall contact tracked. Chaetae fluorescence appears white against a dark background of cryolite. Different colored tracked positions correspond to different setigers, with setiger 3 in red and setiger 8 in magenta. Sequence in Figure 3A-H. Worm width is ~0.27 mm.