More on bloodsucking leeches …
Meyer also guesses that the wormlike creatures in Clear Creek were likely black fly larvae of the Family Simuliidae. Some folks call these black flies no-see-ums. The adult females are rather slow-moving and smaller than a house fly. They may bite humans and other mammals and those bites can be itchy for a day or two. The aquatic larvae are black and attach in masses to the surface of rocks in swift water, anchored by a silk thread. They are benign at this stage and often confused with leeches simply because they are small, black and wiggly.
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