<i >Gasterophilus</i> spp, third instars (bots)

Gasterophilus spp, third instars (bots)

Third instars of Gasterophilus attached to the gastric mucosa of a horse infected with both G intestinalis attached around the margo plicatus (left) and G nasalis attached in the pyloric region (right).

Courtesy of Dr. Martin K. Nielsen.