Bob Goldstein/Wiki Commons

This is Strelkovimermis spiculatis — a parasitic nematode, or roundworm — casually escaping from an unlucky, soon-to-be-expired mosquito larva. The way this larva twitches as the nematode slithers out is gut-wrenching. You can still see the poor larva’s vitals pumping even after nematode evac is complete and the larva’s torn cuticle gapes, dooming it to die. It appears nematode-infested mosquito larvae get a bonus microtaste of the Aztec human sacrifice experience, in the end.