This species occurs sympatrically with X. mixei and apparently prefers deeper pools; in rapidly flowing river with boulders and riffles .
A species characterized by a longer caudal appendage, sword index 0.25; fainter orange stripes that fade in older individuals and pronounced melanophore pigmentation at the edges of the dorsal and ventral sword margins (in males) .: fusiform / normal.
Behavioural data for Southern mountain swordtail is currently being reviewed.
Freshwater; pelagic; depth range 2 - 3 m . Tropical North America: Mexico.
The following diseases are known to affect Southern mountain swordtail.
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