| Plastron |
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Information AboutPlastron |
| CATEGORIES ABOUT PLASTRON | |
| animal anatomy | |
| tortoises | |
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The plastron is the nearly flat part of the shell structure of a Turtle or Tortoise , what one would call the belly, similar in composition to the Carapace ; with an external layer of horny material divided into plates called Scute s and an underlying layer of interlocking bones. In certain families there is a hinge between the , female. This is because of the mating position. The plastral scutes join along a central seam down the middle of the plastron. The relative lengths of the seam segments can be used to help identify a species of Turtle or Tortoise . There are six laterally symmetric pairs of scutes on the plastron: gular, humeral, pectoral, abdominal, femoral, and anal (going from the head to the tail down the seam). Indicating that the abdominal and gular scute seams are approximately the same length and the the femoral and pectoral seams are approximately the same length. Comparison of the plastral formulas provides distinction between the two species. Turtle plastrons were used by the ancient Chinese in a type of Divination called Plastromancy . See also Oracle Bone s. SEE ALSO
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