The Texas wolf (Canis lupus monstrabilis) is an extinct subspecies of gray wolf, distinct from the Texas red wolf (Canis rufus), whose range once included southern and western Texas and northeastern Mexico. Description It was darker than its more northern cousins, and has a highly arched frontal bone. Taxonomy It is recognized as a subspecies of Canis lupus in the taxonomic authority Mammal Species of the World (2005). References Wolves in the United States Extinct canines Extinct animals of the United States Extinct animals of Mexico Subspecies of Canis lupus Mammals described in 1937 Taxa named by Edward Alphonso Goldman Species made extinct by deliberate extirpation efforts