Adult <a href="https://en.wikipedia.org/wiki/Black_Fly" class="extiw" title="en:Black Fly">Black Fly</a> (<i><a href="//commons.wikimedia.org/w/index.php?title=Simulium_yahense&amp;action=edit&amp;redlink=1" class="new" title="Simulium yahense (page does not exist)">Simulium yahense</a></i>) with  (<i>Onchocerca volvulus</i>)  emerging from the insect's antenna. The parasite is responsible for the disease known as <a href="https://en.wikipedia.org/wiki/River_Blindness" class="extiw" title="en:River Blindness">en:River Blindness</a> in Africa. Sample was chemically fixed and critical point dried, then observed using conventional scanning electron microscopy.
<p>Magnified 100X.
</p>
(SEM) Plate #04999.
United States Department of Agriculture
From <a rel="nofollow" class="external autonumber" href="http://emu.arsusda.gov/typesof/pages/black%20fly.html">[1]</a>