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 ?
The plastron (bottom shell) is reduced in size, exposing large fleshy areas around the base of each leg.
This intricate structure suggests that spiracles on thrips function as plastrons (Moritz 1985, 1997).
As in the previous situation, beginning in the en garde position, the fencers lunged as swiftly as possible trying to place the sword point inside the circle that appeared within the plastron ([S.
The fixed-effect explanatory variables were the individual-specific variables sex and plastron length, plus the following day-specific variables: solar irradiance, minimum daily temperature, maximum daily temperature, total evaporation, average wind speed, and day (June 7 = Day 1, to account for any consistent trend in detection probability).
3 mm straight plastron length, 30 mm maximum shell height, and it weighed 33 g (Figure 3).
That changed in 2008 with the discovery of Chinese Odontochelys semitestacea, a reptile about 220 million years old, which had a fully developed plastron -- the belly side of the shell -- but only a partial carapace on its back.
It had a fully developed plastron (the belly portion of a turtle's shell), but only a partial carapace made up of distinctively broadened ribs and vertebrae on its back.
Los espacios articulares estaban envueltos por tejido duro, a manera de un plastron fibroso que le daba consolidacion esclerosante al area, protruyente hacia la superficie, lo cual hacia dificil la movilidad en dicha articulacion.
Esta incision permite la introduccion del dedo indice, si se quiere palpar el sitio del apendice o comprobar si hay algun plastron pequeno, liberandolo digitalmente.
Three adult turtles, tagged for identification using colored pipe cleaners wrapped around the carapace and plastron, were housed in individual aquaria containing 20-liters of water from each of the eleven sites.