This view of the head shows the lighter colored band along the edge of the head and across the back of the head. The most posterior clusters of ocelli are near the posterior end of the band along the border.
This view of the front of the head (contracted, alcohol-preserved specimen) shows the combined mouth and proboscis at the front of the head. Photo by Dave Cowles, March 2010
The animal has a pair of raised longitudinal middorsal ridges (colored white on its head). The ridges, separated by a darker pigmented area, continue back along the body for several times the length of the head then fade out. This individual is hard to focus on because it is crawling rapidly. Photo by Dave Cowles, July 2012
This view of the underside of the head (the worm is crawling on the water's surface film) shows the anterior but ventral mouth. Photo by Dave Cowles, July 2012