Note:

Anche conosciuto come Surmolotto, Topo di fogna, Ratto comune, ha soppiantato il nero Rattus rattus.

Tassonomia:

Domain: Eukaryota - Whittaker & Margulis,1978 - eukaryotes
Kingdom: Animalia - C. Linnaeus, 1758 - animals
Subkingdom: Bilateria - (Hatschek, 1888) Cavalier-Smith, 1983
Branch: Deuterostomia - Grobben, 1908
Infrakingdom: Chordonia - (Haeckel, 1874) Cavalier-Smith, 1998
Phylum: Chordata - Bateson, 1885 - Chordates
Subphylum: Vertebrata - Cuvier, 1812 - Vertebrates
Infraphylum: Gnathostomata - auct. - Jawed Vertebrates
Superclass: Tetrapoda - Goodrich, 1930
Class: Mammalia - C. Linnaeus, 1758
Subclass: Theriiformes - (Rowe, 1988) M.C. McKenna & S.K. Bell, 1997
Infraclass: Holotheria - (Wible et al., 1995) M.C. McKenna & S.K. Bell, 1997
Superlegion: Trechnotheria - McKenna, 1975
Legion: Cladotheria - McKenna, 1975
Sublegion: Zatheria - McKenna, 1975
Infralegion: Tribosphenida - (McKenna, 1975) M.C. McKenna & S.K. Bell, 1997
Supercohort: Theria - (Parker & Haswell, 1897) M.C. McKenna & S.K. Bell, 1997
Cohort: Placentalia - (Owen, 1837) M.C. McKenna & S.K. Bell, 1997
Magnorder: Epitheria - (Mckenna, 1975) M.c. Mckenna & S.k. Bell, 1997
Superorder: Preptotheria - (McKenna, 1975) McKenna, in Stucky & McKenna, in Benton, ed., 1993
Grandorder: Anagalida () - (Szalay & McKenna, 1971) McKenna, 1975
Mirorder: Simplicidentata - (Weber, 1904) M.C. McKenna & S.K. Bell, 1997
Order: Rodentia - Bowdich, 1821 - Rodents
Suborder: Myomorpha - Brandt, 1855
Infraorder: Myodonta - (Schaub, in Grassé & Dekeyser, 1955) M.C. McKenna & S.K. Bell, 1997
Superfamily: Muroidea - Illiger, 1811
Family: Muridae - (Illiger, 1811) Gray, 1821
Subfamily: Murinae
Genus: Rattus - Fischer de Waldheim, 1803
Specific name: norvegicus - (Berkenhout, 1769)
Scientific name: - Rattus norvegicus (Berkenhout, 1769)