Eucoleus aerophilus - Adult female <i>Eucoleus aerophilus</i> on the mucosa of the opened trachea of a fox dissected after formalin fixation. More than half of the worm body is inside the tracheal mucosa with a zig-zag shape and the other part is free in the lumen. Scale bar – 1 mm. © Lalošević, V., Lalošević, D., Čapo, I., Simin, V., Galfi, A. & Traversa, D. - CC BY 4.0 - Wikimedia Commons
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