Two new catostomid fishes (Cypriniformes) from the northern Sierra Madre Occidental of Mexico. American Museum novitates ; no. 2849

Abstract

Two new species of Catostomus (sensu stricto) are described from northwest Mexico. One inhabits northeastern headwater streams in the Río Yaqui drainage and the other is widely distributred in the southern and southeastern parts of the Río Yaqui and in the upper Río Mayo basin. These new taxa exhibit low pharyngeal tooth counts, possibly indicating a close relationship between them. They are hypothesized to be members of an old, regional ichthyofauna that stretches from central Mexico to northwest United States"--P. [1].