An individual sclerite (hard plate) that forms part of the internal breastbone structure in arthropods.
From Greek 'entos' (inside), Latin 'sternum' (breastbone), and '-ite' (part or segment). This combines anatomical and mineralogical terminology for segmented skeletal parts.
An 'entosternite' is one of the hard plates in an insect's internal skeleton—it's like a single link in a chain mail suit that gives the insect structural support from within.
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