Background:

In Mexico, four species of freshwater amphipods of the genus Hyalella have been reported in 14 states of the republic, however, the state of Morelos had no previous record.

Objectives:

The aim of this work was to address a new record of Hyalella azteca in Morelos, Mexico.

Methods:

The amphipods were collected in water springs near to Cuautla, Morelos, Mexico, and preserved in 70% alcohol.

Results:

H. azteca was recognized with the aid of morphological characteristics along with variations such as the distance of the setae in the tip of telson and a large lobe in the posterodistal margin of gnathopod 2.

Conclusions:

This is the first record of the species in the state of Morelos, Mexico.