The morphologic and morphometric data support C. ruana sp. nov. as a valid species, clearly distinct from the morphologically similar C. balsasensis and C. infamatus and from C.limpidus, which is the species found closest geographically.The difference with C. tecomanus was also clear. The overall resemblance in the habitus among C. limpidus and C. balsasensis and C. ruana makes it very likely that this new species is actually more widespread across the Balsas Basin, but has been misidentified in collections.