plastral

[ plas-truh l ]

/ ˈplæs trəl /

of or relating to a plastron.

Origin of plastral

First recorded in 1885–90; plastr(on) + -al¹

Siebenrock's synopsis of living trionychids was based entirely on plastral characters.

North American Recent Soft-shelled Turtles (Family Trionychidae) |Robert G. Webb
The gular scutes, on the anterior edge of the forelobe, become worn long before other plastral laminae do.

Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz |John M. Legler
The external scutellation of the plastral hinge in adults also differs from that in juveniles.

Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz |John M. Legler
The smallest female, from Lajitas, having a plastral length of 6.9 centimeters, has a mottled carapace.

North American Recent Soft-shelled Turtles (Family Trionychidae) |Robert G. Webb

The pattern of sculpturing on the plastral bones as well as that of the carapace is generally of anastamosing ridges.

North American Recent Soft-shelled Turtles (Family Trionychidae) |Robert G. Webb