Actively swimming just below the surface of the water. Others seen crawling on the bottom in shallow water. Seem to 'breathe' through their tail end. A previous sighting (3398125) of what seems to be the same thing was tentatively identified as a Dipter(i)a larva, but the mouthparts were not visible. They always seem to be covered in debris.
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2,099,601 sightings of 19,106 species in 5,076 locations from 10,178 contributors
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