intergular

from The Century Dictionary.

• Lying between or just back of the gular shields of turtles.
• noun In herpetology, a median, unpaired, horny plate covering the anterior end of the plastron in some of the Pleurodira or side-necked turtles.
• noun In ichthyology, a bonyplate lying just back of the chin, between the rami of the jaw, as in the fresh-water dog-fish, Amia.