What is "arvicola riparius"

Vole \Vole\, n. (Zo["o]l.) Any one of numerous species of micelike rodents belonging to Arvicola and allied genera of the subfamily Arvicolin[ae]. They have a thick head, short ears, and a short hairy tail.

Note: The water vole, or water rat, of Europe ( Arvicola amphibius) is a common large aquatic species. The short-tailed field vole ( Arvicola agrestis) of Northern and Central Europe, and Asia, the Southern field vole ( Arvicola arvalis), and the Siberian root vole ( Arvicola [oe]conomus), are important European species. The common species of the Eastern United States ( Arvicola riparius) (called also meadow mouse) and the prairie mouse ( Arvicola austerus) are abundant, and often injurious to vegetation. Other species are found in Canada.