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Nerodia fasciata (LINNAEUS, 1766)

IUCN Red List - Nerodia fasciata - Least Concern, LC
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Higher TaxaColubridae (Natricinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
SubspeciesNerodia fasciata confluens (BLANCHARD 1923)
Nerodia fasciata fasciata (LINNAEUS 1766)
Nerodia fasciata pictiventris (COPE 1895) 
Common NamesE: Southern Water Snake
fasciata: Banded Water Snake, Broad-banded Water Snake
confluens: Broad-banded Water Snake
pictiventris: Florida Water Snake
G: Gebänderte Wassernatter, Südliche Schwimmnatter 
SynonymColuber fasciatus LINNAEUS 1766: 378
Coluber fasciatus — SHAW & NODDER 1797: plate 266
Tropidonotus fasciatus — HOLBROOK 1842: 25
Nerodia fasciata — BAIRD & GIRARD 1853: 39
Tropidonotus fasciatus — DUMÉRIL, BIBRON & DUMÉRIL 1854: 566
Tropidonotus Pogonias — DUMÉRIL & BIBRON 1854: 574 (fide WALLACH p.c.)
Tropidonotus bisectus COPE 1887: 146 (fide BOULENGER 1893)
Tropidonotus fasciatus — BOULENGER 1893: 242
Natrix fasciata — LOENNBERG 1894
Natrix fasciata — COPE 1900: 963
Natrix bisecta — COPE 1900: 977
Natrix fasciata confluens BLANCHARD 1923
Natrix sipedon fasciata — VAN HYNING 1931
Natrix fasciata fasciata — ALLEN 1932
Nerodia sipedon fasciata — CLAY 1938: 179
Natrix sipedon engelsi BARBOUR 1943 (fide CONANT 1961: 19)
Natrix sipedon engelsi — SCHMIDT 1953: 162
Nerodia fasciata — CONANT 1963
Nerodia fasciata fasciata — CONANT & COLLINS 1991: 153
Nerodia fasciata pictiventris — CONANT & COLLINS 1991: 154
Nerodia fasciata confluens — CONANT & COLLINS 1991: 154
Nerodia fasciata — CROTHER 2000: 67
Nerodia fasciata fasciata — TENNANT & BARTLETT 2000: 141
Nerodia fasciata fasciata — CROTHER et al. 2012
Nerodia fasciata — WALLACH et al. 2014: 484
Nerodia fasciata fasciata — GUYER et al. 2018

Nerodia fasciata confluens (BLANCHARD, 1923)
Natrix fasciata confluens BLANCHARD 1923
Natrix sipedon confluens — STEJNEGER & BARBOUR 1933: 117
Natrix fasciata confluens — BURT 1935
Natrix sipedon confluens — CLAY 1938: 179
Nerodia fasciata confluens — MEHRTENS 1987: 158
Nerodia fasciata confluens — CROTHER 2000: 67
Nerodia fasciata confluens — TENNANT & BARTLETT 2000: 143
Nerodia fascita [sic] confluens — MATTISON 2007: 246
Nerodia fasciata confluens — CROTHER et al. 2012
Nerodia fasciata confluens — GUYER et al. 2018

Nerodia fasciata pictiventris (COPE 1895)
Natrix fasciata pictiventris COPE 1895: 677
Natrix fasciata pictiventris — COPE 1900: 969
Natrix sipedon pictiventris — VAN HYNING 1931
Natrix sipedon pictiventris — STEJNEGER & BARBOUR 1933: 96
Nerodia fasciata pictiventris — MEHRTENS 1987: 157
Nerodia fasciata pictiventris — CROTHER 2000: 67
Nerodia fasciata pictiventris — TENNANT & BARTLETT 2000: 145
Nerodia fasciata pictiventris — SCHMIDT & KUNZ 2005: 27
Nerodia fasciata pictiventris — WERNING 2007
Nerodia fasciata pictiventris — CROTHER et al. 2012
Nerodia fasciata pictiventris — LILLYWHITE 2014: 30
Nerodia fasciata pictiventris — GUYER et al. 2018 
DistributionUSA (E Texas, Louisiana, SE Oklahoma, Tennessee, Arkansas, W Mississippi, S Alabama, Florida, S/E Georgia, S/E South Carolina, S/E North Carolina, SE Missouri, Illinois, Arizona)

Type locality: Carolina.

confluens: USA (Arkansas, Louisiana, Alabama, Mississippi, Missouri, E Texas, Oklahoma); Type locality: Butler County, Missouri.

pictiventris: USA (Florida, extreme SE Georgia); Type locality: Gainesville, Florida.  
Reproductionovovivparous. Hybridization: Nerodia sipedon and N. fasciata hybridize “massively” in their contact zones, e.g. in the Carolinas and Georgia (Mebert 2008). 
TypesType: unlocated (A. Garden, 1760- 1761) (fide V. Wallach, pers. comm.)
Holotype: UMMZ 57707 [confluens]
Holotype: MCZ 46688 [engelsi]
Syntypes: USNM 5473 etc [pictiventris]
Holotype
Holotype: USNM 14643 [Tropidonotus bisectus] 
DiagnosisDIAGNOSIS: This snake may be distinguished from the peninsular N. s. pictiventris, which it resembles rather closely, by the shape of the ventral markings-squarish spots in fasciata, elongate dark areas near the anterior margins of the ventrals in pictiventris-and by the presence generally of more than 128 ventrals in fasciata and fewer than this numberin pictiventris. The dorsal pattern of transversebands throughout the length of the body will usually distinguish fasciata from pleuralis, in which most often the posterior portion of the dorsal pattern is composed of alternating dorsal and lateral spots. Furthermore,the belly of pleuralis is marked with half-circular spots. N. s. confluens and fasciata may be separated on the basis of the number of dorsal saddles, the former having 11 to 17, the latter about 19 to 30 [CLAY 1938: 178].


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CommentIllustration in Reptilia (Münster) 8 (2): 21. Illustration of N. f. pictiventris in SCHMIDT (2004).

Synonymy: BLANEY & BLANEY 1979 suggested that N. fasciata is synonymous with N. sipedon.

Habitat: at least partially coastal and thus considered (partially) “marine”.

Distribution: introduced to S California (Reed et al. 2016).

NCBI taxon ID: 876473 [confluens]
NCBI taxon ID: 310399 [pictiventris] 
EtymologyNamed after Latin fascia = band, for the dorsal cross-bands in this species. 
References
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