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Nerodia fasciata (LINNAEUS, 1766)

IUCN Red List - Nerodia fasciata - Least Concern, LC

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Higher TaxaNatricidae, Colubroidea, Serpentes (snakes) 
SubspeciesNerodia fasciata confluens (BLANCHARD 1923)
Nerodia fasciata fasciata (LINNAEUS 1766)
Nerodia fasciata pictiventris (COPE 1895: 677) 
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 confluens BLANCHARD 1923
Natrix fasciata fasciata — ALLEN 1932
Nerodia sipedon fasciata — CLAY 1938: 179
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 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 — 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 pictiventris (COPE 1895)
Natrix fasciata pictiventris COPE 1895: 677
Natrix sipedon pictiventris — STEJNEGER & BARBOUR 1933: 96
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 
DistributionUSA (E Texas, Louisiana, SE Oklahoma, Arkansas, W Mississippi, S Alabama, Florida, S/E Georgia, S/E South Carolina, S/E North Carolina, SE Missouri, Illinois)

Type locality: Carolina.

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

pictiventris: Florida, S Texas; Type locality: Gainesville, Florida. Map legend:
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
 
TypesType: location unknown (A. Garden, 1760- 1761) [fide V. Wallach, pers. comm.]
Holotype: UMMZ [confluens] 
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”.

Reproduction: viviparous. Hybridization: Nerodia sipedon and N. fasciata hybridize “massively” in their contact zones, e.g. in the Carolinas and Georgia (Mebert 2008).

DIAGNOSIS: 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].

DIAGNOSIS (confluens): This species is easily recognized by the number of dorsal cross bands, 11 to 17, which is lower than that of any other Americanspecies of Natrix. In most other respects, including scutellation and proportions, it is fairly similar to N. s. fasciata [CLAY 1938: 179].

DIAGNOSIS (pictiventris): The typical dorsal markings of this snake consist of a series of 26 to 35 reddish-brownto black cross bands, but in mature individuals the lateral interspaces sometimes become darker than the lateral portions of the cross-bands and thus produce an appearance of alternating dorsal and lateral spots. For differences between this form and N. s. fasciata, see the latter (p.
179). From N. s. compressicauda it may be distinguished by the absence or poor delineation of a midventral series of light spots [CLAY 1938: 180]. 
References
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  • Blanchard, Frank N. 1923. A new North American snake of the genus Natrix. Occasional Papers of the Museum of Zoology, University of Michigan (140): 1-6
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