Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Microtus (Mynomes) breweri Baird 1857 Microtus (Mynomes) breweri Baird 1857 , Mammalia , in: Repts. U. S. Expl. Surv., Vol. 8, 1: 525 . Type Locality: USA , Massachusetts , Muskeget Isl, off Nantucket. Vernacular Names: Beach Vole . Distribution: Known only from the type locality. Conservation: IUCN – Lower Risk (nt). Discussion: Subgenus Mynomes , pennsylvanicus species group sensu Zagorodnyuk (1990) . An insular vicariant of M. pennsylvanicus , the two are inseparable karyotypically ( Fivush et al., 1975 ; Modi, 1986 ), marginally distinct electrophoretically ( Kohn and Tamarin, 1978 ), but morphologically sharply discrete ( Bailey, 1900 ; Miller, 1896 ; Moyer et al., 1988 ). Although posited as conspecific with M. pennsylvanicus (e.g., Corbet and Hill, 1991 ; Jones et al., 1986 ; Modi, 1986 ; Whitaker and Hamilton, 1998 ), Moyer et al. (1988) mustered convincing evidence for the retention of breweri as a species. See Tamarin and Kunz (1974 , Mammalian Species, 45).