A single hardened plate or sclerite (body segment) that makes up the episternal region in an arthropod's thorax.
From 'episternum' + '-ite' (a suffix meaning a segment or structure), used in detailed entomological anatomy to describe individual hardened plates in the episternal area.
The suffix '-ite' means 'segment' or 'part,' so an episternite is literally one tiny piece of an insect's armor—scientists can map an entire bug by naming all its individual sclerites.
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