Large-river habitat
It inhabits moderately clear to turbid large rivers and the lowest portions of major tributaries. This setting differs from the clear upland streams occupied by some related Macrhybopsis species. Its elongated body has eight dorsal-fin rays and usually seven to nine anal-fin rays in the summary.
Taxonomic history
Macrhybopsis tomellerii was described in a 2017 revision of the speckled chub complex. Older accounts using a broader species name may combine several fishes now treated separately. Drainage information is especially helpful when interpreting those historical records.
