Eurycheilichthys limulus is a species of armored catfish endemic to Brazil, where it is found in the upper Jacuí River basin.

The habitat at the type locality of E. limulus is a small river about 3–5 metres wide with moderate water current, bottom comprising some rocks but mostly sand and a large amount of marginal vegetation.

These fishes live among leaves and stalks.

[2] This species grows to a length of 4.8 centimetres (1.9 in) SL.

This article relating to Otothyrinae is a stub.