The innermost ventral bony plate of a turtle's plastron (belly shell), located between the epiplastron and the hyoplastron.
Greek 'entos' (within) + 'plastron' (breastplate). Named in herpetological literature to precisely describe turtle shell anatomy and structure.
Turtle shells are architectural marvels—the entoplastron is the deepest interior plate that actually touches the turtle's skeleton, giving the shell its strength and rigidity.
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