Plural of haustellum; small sucker-like or tubular mouth structures found on certain parasitic organisms like leeches or tapeworms.
From Latin 'haustellum,' diminutive of 'haustus' (drawn), referring to structures used for drawing or sucking up; a technical term in zoology and parasitology.
Parasites have these tiny sucker-mouths called haustella—it's a creepy but brilliant adaptation that lets worms and leeches attach and feed, and scientists named it using Latin to sound properly scientific about something gross.
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