Whilst examining aquatic plant air spaces and distinguishing tiny yellow flowering bladderworts from each other, I detected a movement in my plant tray. It came from this little brown speck ...
which turned into this as it moved along - the head stretches forward and uses the same looping motion as an inchworm to pull itself forward, attaching and detaching front and back suckers alternately to move forward.
In the initial round ball resting position, it's difficult to recognize the organism as a leech.
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