The tentacles are U-shaped in cross-section, having a large ciliated trough along one side. Particles can from time to time be seen moving down the trough toward the mouth.
In this closup photo of the thorax, the notopodia with capillarynotosetae can be seen on the left and the neuropodia with the single straight rows of uncini can be seen on the left. The white filamentous strands are tentacles. Dorsal is to the left, ventral to the right, anterior is to the top.
Thelepus setosus, about 8 cm long. The tentacles are white and the gills are red. The pads on the ventral side of the thoracic segments are visible on the upper side of the first (thoracic) part of the body, and the narrower abdominal segments are coiled to the right. (Photo by: Dave Cowles, July 2006)
