In insects, the region of the head between the antennae and the mouth; a small plate or area on the insect's face.
From Greek 'epi-' (upon) + 'stoma' (mouth), literally meaning 'upon the mouth.' This technical anatomical term emerged in entomology to describe a specific part of insect head structure.
Insects have surprisingly complex head anatomy—the epistoma is just one tiny region, but entomologists needed precise names for every part to classify and study millions of bug species accurately.
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