A genus of parasitic protozoan organisms related to trypanosomes, found primarily in insects and sometimes pathogenic to mammals.
From Greek krithi (barley) + eidos (form), referring to the organism's barley-seed-like appearance under a microscope. Named by scientists studying single-celled parasites in the late 19th century.
Crithidia are fascinating because they live in the guts of insects like kissing bugs, and understanding them has been crucial for studying how diseases like Chagas disease spread—a tiny organism with huge public health implications.
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