gular
Particularly of an animal: of, pertaining to, or located at the gula (“the upper front of the neck next to the chin”) or the throat.
Iguanæ. [...] Inhabits America, on the gular pouch of the Iguana.
Where it comes from
From gula (“upper throat”) + -ar (suffix forming adjectives). Gula is derived from Latin gula (“gullet, throat; palate”).
Adapted from the Wiktionary entry gular (CC BY-SA 4.0).