A genus of parasitic protozoans (single-celled organisms) that live inside the blood cells and bodies of reptiles and other vertebrates.
From Greek 'haima' (blood) + Latin 'gregarius' (relating to a flock or group), reflecting that these parasites were discovered in the blood and tend to occur in grouped populations within their hosts.
These microscopic parasites are like tiny vampires living in your blood—they were named 'gregarina' because researchers noticed they hang out in clusters together, almost like they're traveling in little herds through the bloodstream of their reptilian hosts.
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