Reptile of the Week: Iguana The name ‘iguana’ comes from the word Iwana which is the local name of the lizard in the Taino language. - The unique features of Iguana are in the skin folds at the bottom of the jaw, the hard skin is spiked along the spine and has parietal eyes above the head. - Iguanas have ear in the form of a timpanium. - The subtimpani sheath is the outer portion of the Iguana ear that lies behind the eye. - Subtimpani sheath is part of skin Iguana thin and soft because it serve