The plural form of 'episterna,' referring to paired structures in arthropods (insects, crustaceans) on the thorax between the coxa and epimeron.
From Greek 'epi' (upon) + 'sternon' (chest/breastbone), forming the anatomical term for these chest-side structures in arthropod body segments.
Insects have these tiny paired structures called epistena on their thorax that are crucial for muscle attachment—they're like invisible architecture that lets your beetle friend fly or your crab friend scuttle.
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