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Helicops yacu ROSSMAN & DIXON, 1975

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Peru Keelback 
SynonymHelicops yacu ROSSMAN & DIXON 1975
Helicops yacu — KAWASHITA-RIBEIRO et al. 2013
Helicops yacu — WALLACH et al. 2014: 323
Helicops yacu — NOGUEIRA et al. 2019 
DistributionPeru (Loreto), Brazil (Acre fide Costa & Bérnils 2018; Nogueira et al., 2019)

Type locality: "from Moropon, Departamento de Loreto, Peru."  
Reproductionovovivparous 
TypesHolotype: TCWC 39093, a 352 mm (SVL) female (P. Soini, May 1972). 
DiagnosisDiagnosis: Helicops yacu can be distinguished from all congeners by the combination of having an entire nasal scale, and intergenials present (for information on references see Suppl. material 3, Schöneberg & Köhler 2021). 
Comment 
EtymologyNamed after Quechua yacu, water. (Esteban Lavilla, pers. comm., April 2024) 
References
  • 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
  • Costa, Henrique Caldeira; Renato Silveira Bérnils 2018. Répteis do Brasil e suas Unidades Federativas: Lista de espécies. Herpetologia Brasileira 7 (1): 11-57
  • 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
  • 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
  • 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
  • Rossman, D. A.; Abe, A. S. 1979. Comments on the taxonomic status of Helicops yacu (Serpentes: Colubridae). Proceedings of the Louisiana Academy of Sciences 42: 7-9
  • Rossman, D. A.; Dixon, J. R. 1975. A new colubrid snake of the genus Helicops from Peru. Herpetologica 31 (4):412-414 - 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
  • 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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