Adults inhabit rocky pools, sometimes runs, of headwaters, creeks, and small rivers. Found among filamentous algae . Migratory behaviour is undetermined .
Dionda argentosa is genetically distinct but morphologically indistinguishable from Guadalupe roundnose minnow, D. nigrotaeniata .: elongated.
Behavioural data for Manantial roundnose minnow is currently being reviewed.
Diet information for Manantial roundnose minnow is currently being compiled.
Reproduction data for Manantial roundnose minnow is currently being compiled.
Freshwater; benthopelagic. Subtropical North America: Devils River and San Felipe Creek in Texas, USA.
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