The mouth is transverse, with a deep fold enclosing its corners and fleshy suctorial lips. The jaws are larger and more powerful than those of I. brasiliensis, and contain fewer tooth rows, numbering around 29 in the upper jaw and 19 in the lower jaw. The upper teeth are small, narrow, and smooth-edged, upright at the center of the jaw and becoming more angled towards the corners.
The mouth is transverse, with a deep fold enclosing its corners and fleshy suction-like lips. The jaws are larger and more powerful than those of I. brasiliensis, and contain fewer tooth rows, numbering around 29 in the upper jaw and 19 in the lower jaw. The upper teeth are small, narrow, and smooth-edged, upright at the center of the jaw and becoming more angled towards the corners.