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Helicops hagmanni ROUX, 1910

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Hagmann's Keelback
Portuguese: Cobra-D’água, Jararaca-D’água, Surucucurana 
SynonymHelicops hagmanni ROUX 1910
Helicops hagmanni — PETERS & OREJAS-MIRANDA 1970: 124
Helicops hagmanni — KORNACKER 1999: 88
Helicops hagmanni — FROTA et al. 2005
Helicops hagmanni — WALLACH et al. 2014: 322
Helicops hagmanni — NOGUEIRA et al. 2019 
DistributionN Brazil (Pará etc.), Colombia ?, Venezuela (TF Amazonas), Peru

Type locality: Santarem, Brazil.  
Reproductionovoviviparous 
TypesHolotype: NMBA 6281, a 630 mm male (G. Hagmann). 
DiagnosisDiagnosis: Helicops hagmanni is distinguished from all its congeners by having subcaudal keels, 21–29 dorsal scale rows at midbody, and 50–59 subcaudals (for information on references see Suppl. material 3, Schöneberg & Köhler 2021).


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Comment 
EtymologyNamed after the collector, Dr. G. Hagmann. 
References
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  • Avila-Pires, T.C.S.; Hoogmoed, M.S. & Vitt, L.J. 2007. Herpetofauna da Amazônia. Herpetologia no Brasil, pp. 13-43
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Bernal, R. 2025. Serpientes de Colombia-Guía de Campo. Serie de Guías Tropicales de Campo. 19: 396 pp. Conservación Internacional Colombia, Bogotá - 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
  • 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
  • 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
  • Fraga, R., Lima, A. P., Prudente, A. L. C., & Magnusson, W. E. 2013. Guia de cobras da região de Manaus – Amazônia Central. Manaus: INPA - get paper here
  • 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
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  • 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
  • Kornacker,P.M. 1999. Checklist and key to the snakes of Venezuela. PaKo-Verlag, Rheinbach, Germany, 270 pp.
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  • Moura, M. R., Costa, H. C., Abegg, A. D., Alaminos, E., Angarita-Sierra, T., Azevedo, W. S., Cabral, H., Carvalho, P., Cechin, S., Citeli, N., Dourado, Â. C. M., Duarte, A. F. V., França, F. G. R., Freire, E. M. X., Garcia, P. C. A., Mol, R., Montero 2023. Unwrapping broken tails: Biological and environmental correlates of predation pressure in limbless reptiles. Journal of Animal Ecology, 92, 324–337
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