Most people don't think that
Ictalurus is found south of the border, but there are quite a few species endemic to Mexico and southwestern US. Many (all?) of these species are threatened by habitat loss and at least one (
I. pricei, the Yaqui catfish) is protected by federal law in the US.
Here is the Lerma catfish (
Ictalurus dugesii):
Watch the Cat-eLog for more of these fascinating fish.