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Helicops polylepis GÜNTHER, 1861

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Norman's Keelback
Portuguese: Cobra-D’água 
SynonymHelicops polylepis GÜNTHER 1861: 426
Tachynectes chrysostictus COPE 1862: 71
Helicops polylepis — BOULENGER 1893: 280
Helicops spixii JAN 1865: 249
Helicops polylepis — AMARAL 1925
Helicops polylepis — PETERS et al. 1970: 125
Helicops polylepis — DA FROTA 2005
Helicops polylepis — WALLACH et al. 2014: 323
Helicops polylepis — NOGUEIRA et al. 2019 
DistributionBrazil (Amazonas, Pará), Colombia, Peru, Bolivia

Type locality: Upper Amazon  
Reproductionovovivparous (Braz et al. 2016) 
TypesType: BMNH 1946.1.13.25 (and possibly additional specimens). 
DiagnosisDiagnosis: Helicops polylepis can be distinguished from all its congeners by the combination of 23–26 dorsal scale rows at midbody, the absence of intergenials, and a semidivided nasal scale (for information on references see Suppl. material 3, Schöneberg & Köhler 2021). 
CommentSynonymy mostly that of PETERS & OREJAS-MIRANDA 1970.

 
References
  • Amaral, A. do 1925. South American snakes in the collection of the United States National Museum. Proc. US Natl. Mus. 67 (24): 1-30 - get paper here
  • BERNARDE, P.S., ALBUQUERQUE, S., BARROS, T.O. & TURCI, L.C.B. 2012. Serpentes do Estado de Rondônia, Brasil. Biota Neotropica 12 (3): 1-29 - get paper here
  • Boulenger, G.A. 1893. Catalogue of the snakes in the British Museum (Nat. Hist.) I. London (Taylor & Francis), 448 pp. - get paper here
  • Braz, Henrique B.; Rodrigo R. Scartozzoni, Selma M. Almeida-Santos 2016. Reproductive modes of the South American water snakes: A study system for the evolution of viviparity in squamate reptiles. Zoologischer Anzeiger 263: 33-44; doi:10.1016/j.jcz.2016.04.003 - get paper here
  • Camargo, I. C. M., Veras, J. C. P., Ribeiro, S., Kawashita-Ribeiro, R. A., de Fraga, R., & Junior, A. P. S. 2021. Sexual dimorphism in the South American water snake Helicops polylepis (Serpentes: Dipsadidae). Phyllomedusa 20(1): 15-25 - get paper here
  • Carvalho Teixeira, Cássia de; Luciano Fogaça de Assis Montag, and Maria Cristina dos Santos-Costa 2017. Diet Composition and Foraging Habitat Use by Three Species of Water Snakes, Helicops Wagler, 1830, (Serpentes: Dipsadidae) in Eastern Brazilian Amazonia. Journal of Herpetology 51 (2): 215-222. - get paper here
  • CATENAZZI, A., LEHR, E. & VON MAY, R. 2013. The amphibians and reptiles of Manu National Park and its buffer zone, Amazon basin and eastern slopes of the Andes, Peru. Biota Neotropica 13 (4): 269-283
  • Cope, E.D. 1862. Synopsis of the species of Holcosus and Ameiva, with diagnoses of new West Indian and South American Colubridae. Proc. Acad. Nat. Sci. Philadelphia 14: 60-82. - get paper here
  • Costa, Henrique C.; Diego J. Santana, Fernando Leal, Ricardo Koroiva, and Paulo C.A. Garcia 2016. A New Species of Helicops (Serpentes: Dipsadidae: Hydropsini) from Southeastern Brazil. Herpetologica 72 (2): 157-166 - get paper here
  • da Frota, J.G. 2005. Nova espécie de Helicops Wagler, 1830 (Serpentes, Colubridae) do rio Tapajós, Amazonia, Brasil. Phyllomedusa 4 (1): 61-68 - get paper here
  • Duellman, W. E. 2005. Cusco Amazónico: The Lives of Amphibians and Reptiles in an Amazonian Rainforest. Comstock Pub Assoc.
  • Duellman, W.E., & Salas, A.W. 1991. Annotated checklist of the amphibians and reptiles of Cuzco Amazonico, Peru. Occas. Papers Mus. of Natur. Hist., Univ. of Kansas, Lawrence (143): 13 pp. - get paper here
  • Franca, F.G.R.; Mesquita, Daniel Oliveira and Guarino Rinaldi Colli 2006. A CHECKLIST OF SNAKES FROM AMAZONIAN SAVANNAS IN BRAZIL, HOUSED IN THE COLEÇÃO HERPETOLÓGICA DA UNIVERSIDADE DE BRASÍLIA, WITH NEW DISTRIBUTION RECORDS. Occ. Pap. Oklahoma Mus. Nat. Hist., Univ. Oklahoma 17: 1-13
  • Frota, J.G. da; Pedroso dos Santos-Jr, Alfredo; Menezes-Chalkidis, H. de & Guimarães Guedes, A. 2005. AS SERPENTES DA REGIÃO DO BAIXO RIO AMAZONAS, OESTE DO ESTADO DO PARÁ, BRASIL (SQUAMATA). Biociências 13 (2): 211-220 - get paper here
  • Gonzalez R. C. et al. 2020. Lista dos Nomes Populares dos Répteis no Brasil – Primeira Versão. Herpetologia Brasileira 9 (2): 121 – 214 - get paper here
  • Günther, A. 1861. On the ophidian genus Helicops. Ann. Mag. Nat. Hist. (3) 7: 425-428 - get paper here
  • Hoogmoed, M.S. 1982. Snakes of the Guianan Region. Mem. Inst. Butantan 46: 219-254. - get paper here
  • Jan, G. 1865. Enumerazione sistematica degli ofidi appartenenti ai gruppo Potamophilidae. Archive per la Zoologia, l’Anatomia et la Fisiologia 3 (2): 201-265 - get paper here
  • Kawashita-Ribeiro, Ricardo Alexandre; Robson Waldemar Ávila, and Drausio Honorio Morais 2013. A New Snake of the Genus Helicops Wagler, 1830 (Dipsadidae, Xenodontinae) from Brazil. Herpetologica 69 (1): 80-90. - get paper here
  • Lima Moraes, L. J. C. de, do Nascimento Rainha, R., de Pinho Werneck, F., de Souza Oliveira, A. F., Gascon, C., & de Carvalho, V. T. 2022. Amphibians and reptiles from a protected area in western Brazilian Amazonia (Reserva Extrativista do Baixo Juruá). Papéis Avulsos de Zoologia, 62, e202262054-e202262054 - get paper here
  • Metcalf, M. F., Guedouar, E., Davis, L., Rodriguez, A., Marsh, A., Pacaya, E. T., ... & Gunnels IV, C. W. 2023. Herpetofauna of Madre Selva Biological Station in Loreto, Peru. Herpetology Notes, 16, 727-740
  • Metcalf, Matthew; Alexander Marsh, Emerson Torres, Devon Graham, Charles Gunnels 2020. Herpetofauna of the Santa Cruz Forest Preserve in the Peruvian Amazon Basin. Herpetology Notes 13: 753-767 - get paper here
  • MORAES-DA-SILVA, ANTONIO; RENATA CECÍLIA AMARO, PEDRO M. SALES NUNES, CHRISTINE STRÜSSMANN, MAURO JUNIOR TEIXEIRA, ALBEDI JR. ANDRADE, VINÍCIUS SUDRÉ, RENATO RECODER, MIGUEL TREFAUT RODRIGUES, FELIPE FRANCO CURCIO 2019. Chance, luck and a fortunate finding: a new species of watersnake of the genus Helicops Wagler, 1828 (Serpentes: Xenodontinae), from the Brazilian Pantanal wetlands. Zootaxa 4651 (3): 445–470 - get paper here
  • Nogueira, Cristiano C.; Antonio J.S. Argôlo, Vanesa Arzamendia, Josué A. Azevedo, Fausto E. Barbo, Renato S. Bérnils, Bruna E. Bolochio, Marcio Borges-Martins, Marcela Brasil-Godinho, Henrique Braz, Marcus A. Buononato, Diego F. Cisneros-Heredia, 2019. Atlas of Brazilian snakes: verified point-locality maps to mitigate the Wallacean shortfall in a megadiverse snake fauna. South American J. Herp. 14 (Special Issue 1):1-274 - get paper here
  • Pérez-Santos,C. & Moreno, A.G. 1988. Ofidios de Colombia. Museo reegionale di Scienze Naturali, Torino, Monographie VI, 517 pp.
  • Peters, James A.; Donoso-Barros, Roberto & Orejas-Miranda, Braulio 1970. Catalogue of the Neotropical Squamata: Part I Snakes. Bull. US Natl. Mus. 297: 347 pp. - get paper here
  • Rabosky, Daniel L.; Rudolf von May, Michael C. Grundler and Alison R. Davis Rabosky 2019. The Western Amazonian Richness Gradient for Squamate Reptiles: Are There Really Fewer Snakes and Lizards in Southwestern Amazonian Lowlands? Diversity 11: 199; doi:10.3390/d11100199 - get paper here
  • Rivas, L. R., Eversole, C. B., & Powell, R. L. 2023. Urban herpetofauna of Trinidad, Beni Department, Bolivia. Herpetology Notes, 16, 399-410
  • Rodrigues-França, Frederico Gustavo & Nathocley Mendes-Venâncio 2010. Reptiles and amphibians of a poorly known region in southwest Amazonia Biotemas, 23 (3): 71-84 - get paper here
  • Santos-Costa, Maria Cristina dos; Gleomar Fabiano Maschio, Ana Lúcia da Costa Prudente 2015. Natural history of snakes from Floresta Nacional de Caxiuanã, eastern Amazonia, Brazil. Herpetology Notes 8: 69-98 - get paper here
  • Schmidt, Karl P. & Walker, Warren F. 1943. Peruvian snakes from the University of Arequipa. Zoological Series of Field Museum of Zoology 24 (26): 279-296 - get paper here
  • Schöneberg Y, Köhler G 2022. Distribution and identification of the species in the genus Helicops Wagler, 1830 (Serpentes, Colubridae, Xenodontinae). Biodiversity Data Journal 10: e69234 - get paper here
  • Schöneberg, Y., & Köhler, G. 2021. Distribution and identification of the species in the genus Helicops Wagler, 1830 (Serpentes, Colubridae, Xenodontinae). ARPHA Preprints, 1, e67869 - get paper here
  • Silva, F.M.; A.C. Menks; A.L.C. Prudente; J.C.L. Costa; A.E.M. Travassos; U. Galatti. 2011. Squamate Reptiles from municipality of Barcarena and surroundings, state of Pará, north of Brazil. Check List 7 (3): 220-226 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. [type catalogue] Taylor and Francis, CRC Press, 1237 pp.
 
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