On the other hand, I. calvus has minute abdominal platelets with at most six odontodes, a nude area under the first three plates of the lateral line, an unexposed cleithrum, or when exposed, bordering just the superior portion of posterior margin of the opercular opening on lateral side of the body, and an exposed surface of supraoccipital strongly convex, with an area without odontodes at the center.

[2] Species of this genus are commonly found in small to medium headwater streams with clear, fast running, and well-oxygenated water, where the bottom is composed of rocks, boulders, and sometimes gravel.

[2] The holotype of I. epakmos is from the Verde River; it is a small stream with clear water and moderate to strong current, with loose stones and, in some places, sand on the bottom.

[1] The type locality of I. saxicola is a small creek located near the urban area of Londrina city, flowing through a landscape of mixed open fields and riparian vegetation, sometimes with a very degraded margin.

[2] The type locality where some specimens of I calvus were collected is a small creek of rural region, flowing through a landscape of mixed open field, riparian vegetation and forest, sometimes with a very degraded margin.