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 scutes and an underlying layer of interlocking bones.
In certain families there is a hinge between the pectoral and abdominal scutes allowing the turtle to almost completely enclose itself. In certain species the sex of a testudine can be told by whether the plastron is concave, male or convex, 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 femoral and pectoral seams are approximately the same length. Comparison of the plastral formulas provides distinction between the two species.
Plastron is also a name that's been given to various coverings or structures on the ventral (belly) side of some creatures, people or objects.
Measuring Fluctuating Asymmetry in Plastron Scutes of Yellow-Bellied Sliders: The Importance of Gender, Size and Body Location
Apr 01, 2008; ABSTRACT.- The use of fluctuating asymmetry (FA) estimates in animal research is increasing, but most studies thus far have...
Measuring fluctuating asymmetry in plastron scutes of yellow-bellied sliders: the importance of gender, size and body location.(Report)
Apr 01, 2008; INTRODUCTION Minor differences in the degree of symmetry of bilateral characters can signal the developmental stability of an...
Pelvic plastron secondary to acute appendicitis in a child presented as appendiceal intussusception. A case report.(Case Report)(Case study)
Sep 01, 2008; Authors: Efstratios Christianakis ; Anastasios Sakelaropoulos ; Constantinos Papantzimas ; Michael Pitiakoudis ;...