Thamnophis atratus

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Thamnophis atratus


Taxonavigation: Colubroidea 

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Cladus: Unidentata, Episquamata
Cladus: Toxicofera
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Colubroidea

Familia: Colubridae
Subfamilia: Natricinae
Genus: Thamnophis
Species: Thamnophis atratus
Subspecies (3): T. a. atratus – T. a. hydrophilus – T. a. zaxanthus



Thamnophis atratus (Kennicott in Cooper, 1860)

  • Lectotype: USNM 970A, adult ♂, collected by Richar D. Cutts [Pacific Railroad Expedition] in 1854. [designated by Fitch (1940: 89)]
  • Type locality: “California”, restricted to “San Francisco, California” by Fitch (1940: 89), corrected to “the Santa Cruz Mountains or southern San Francisco Peninsula” by Boundy (1999: 330).


  • Eutaenia atratus Kennicott in Cooper, 1860: 296 [original combination]
  • Thamnophis ordinoides atratusVan Denburgh & Slevin, 1918: 224 [subsequent combination, reduce to subspecies]
  • Thamnophis elegans atratusFox, 1948: 120 [subsequent combination, as subspecies]
  • Thamnophis couchii atratusFox & Dessauer, 1964: 266 [subsequent combination, as subspecies]
  • Thamnophis atratusRossman & Stewart, 1987: 19 [subsequent combination, restaure to species]



Primary references


Vernacular names

English: Pacific Coast Aquatic Garter Snake
Wikimedia Commons For more multimedia, look at Thamnophis atratus on Wikimedia Commons.