M. I. WALKER / SCIENCE PHOTO LIBRARY M. I. WALKER / SCIENCE PHOTO LIBRARY
Rheinberg illumination of a small leech (Glossiphonia) which feeds on snails and midge larvae. This is a slide of a stained specimen. The large posterior sucker is well-shown as are the blind sacs (caecae) on either side of the gut. Zeiss Tessovar. Stitch of 2 stacks of 6. HFW = 4.5mm.
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