plastron

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plas·tron

(plas'tron),
The sternum with costal cartilages attached.
[Fr. a breastplate]

plastron

(plăs′trŏn) [Fr., breastplate]
The sternum and attached cartilages.

plastron

  1. the film of air covering parts of the body in aquatic insects such as water beetles, which enables them to stay under water. The film acts as a gill since gas exchange takes place between the water and the air bubble (plastron respiration).
  2. the horny bridge connecting the sides of the carapace below the body of tortoises and turtles.

plastron

skeletal structure protecting the abdomen of chelonians.
Enlarge picture
Plastron of the tortoise. By permission from Aspinall V, O'Reilly M, Introduction to Veterinary Anatomy and Physiology, Butterworth Heinemann, 2004
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References in periodicals archive ?
Santee: one nuchal, seven costal fragments, six peripherals, three epiplastra, two plastral fragments, UNSM 56965; Devils Nest: one nuchal, three coastal fragments, eight peripherals, one right and one left epiplastron, two entoplastra, one right hyoplastron, 12 plate fragments, UNSM 56909.
one neural, two costal fragments, one left xiphiplastron, two plastral fragments, UNSM 56964.