Tongue ovoid, barely notched behind and slightly free posteriorly; vomerine teeth 2-3, situated on V-shaped elevations between round inner nares; openings to vocal sac large, one situated along inner posterior edge of each mandibular ramus.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
The primitive buccal cavity is bounded below by the mandibular arch, which contains Meckel's cartilage, and from which are developed the mandible, the lower lip, and the floor of the mouth.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
mandibular cleft occurs in the middle line of the lower lip, and may extend to, or even beyond, the chin; it is due to non-union of the two lateral halves of the mandibular arch.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson