The Yaqui longfin dace is similar to the Gila longfin dace, but differs slightly in body shape and relative placement of fins, with this form being generally smaller, and less sexually dimorphic, and having longer pre- and postdorsal body lengths.

The Gila and Yaqui longfin daces both have black spots on their caudal fins, and both are fusiform.

[7] They prefer brooks and streams that have sandy or gravely bottoms, typically with overhanging banks protecting them from predator or human observation.

Yaqui longfin dace usually spawn in the spring from December to July, but extend the season into September in low desert habitats.

This helps them provide a safe place for development, allowing minimal disturbance from other species or predators.