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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2,148,794 sightings of 19,882 species in 6,407 locations from 11,276 contributors
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