The Alvord cutthroat trout (Oncorhynchus clarki subsp.) is an un-named subspecies of Cutthroat trout. It was native to springs and creeks of southeast Oregon and northern Nevada and is the only trout taxon considered extinct. The species disappeared within a few decades of the intentional release of non-native rainbow trout into the Alvord cutthroat's only remaining habitat in the 1920s. In zoology, as in other branches of biology, subspecies is the rank immediately subordinate to a species. ... Binomial name Oncorhynchus clarki (Richardson, 1836) Subspecies See text. ... State nickname: Beaver State Official languages None Capital Salem Largest city Portland Governor Ted Kulongoski (D) Senators Ron Wyden (D) Gordon Smith (R) Area  - Total  - % water Ranked 9th 255,026 km² 2. ... State nickname: Silver State, Battle Born State (official) Official languages None Capital Carson City Largest city Las Vegas Governor Kenny Guinn (R) Senators Harry Reid (D) John Ensign (R) Area  - Total  - % water Ranked 7th 286,367 km² 0. ... In biology and ecology, extinction is the ceasing of existence of a species or group of taxa. ...