Nearctic Region

Nearctic Region

 

a zoogeographic region of dry land that is considered by many zoogeographers to be a division of the Holarctic region. The Nearctic Region covers the continent of North America, including the Mexican Plateau, as well as the Aleutian Islands, the Canadian Arctic Archipelago, Greenland, and Newfoundland. The fauna in the northernmost parts is similar to that of the Palearctic division of the Holarctic region. This similarity may be explained by the repeated, prolonged unions of North America and Northeastern Asia in the region of what is now the Bering Sea, which made possible a broad exchange of species.

The Nearctic Region is divided into four subregions: the Arctic, Circumboreal, Western American, and Eastern American. The first two are common to the Palearctic; the last two are often united in the Sonoran subregion. The American portion of the Circumboreal subregion is sometimes regarded as the independent Canadian subregion.

References in periodicals archive ?
Predaceous diving beetles (Coleoptera: Dytiscidae) of the Nearctic Region, with an emphasis on the fauna of Canada and Alaska.
Species widely distributed in Palaearctic Region, Australian Region, Nearctic Region, Neotropical Region, Oriental Region (Lobl and Smetana, 2006).
Of the 300 recognized Pseudomyrmecine species representing three genera--Myrcidris, Pseudomyrmex, and Tetraponera (Ward and Downie, 2005)--only 11 species from the largest genus, Pseudomyrmex, have been recorded from the Nearctic region (Ward, 1989).
Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the northeastern Nearctic region.
mx, Menchaca Armenta, 2004; Melendez Ordonez, 2009), is a locality in the southeastern Nearctic region, near the limits with the neotropics (Fig.
A catalogue of the blood-sucking fly family Tabanidae (horseflies and deerflies) of the Nearctic region north of Mexico.
In other parts of the Nearctic Region, for example in Texas (Otteni and others 1972), Colorado (Martini 1974), Arizona (Franzreb and Laudenslayer 1982), and Rhode Island (Johnston and Hill 1987), Barn Owl diet composition has also been reported to be similar to their diet in Oregon (Taylor 1994).
230-232, in Predaceous diving beetles (Coleoptera: Dytiscidae) of the Nearctic region, with emphasis on the fauna of Canada and Alaska (D.