Nearctic a. : Of or pertaining to a region of the earth's surface including all of temperate and arctic North America and Greenland. In the geographical distribution of animals, this region is marked off as the habitat certain species.

Example:


Taxonomy
United States, Canada, Nearctic ecozone, North America, endemic, Mexico, South America, Flora and fauna, continents, free encyclopedia, Terrestrial Ecoregions, plant, plants and animals, humans, extinctions, Northern Mexico, deserts and xeric shrublands, Canadian Province.

Defination from the web:
Nearctic ecozone covers most of North America, including Greenland and the highlands of Mexico. ... Wide Fund for Nature (WWF) divides the Nearctic into four Bioregions, defined as "geographic clusters of ... It includes the Nearctic's Arctic Tundra and Boreal forest ecoregions. ...