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Epicrates alvarezi ABALOS, BAEZ & NADER, 1964

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Higher TaxaBoidae (Boinae), Henophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Argentinian Rainbow Boa
G: Argentinische Regenbogenboa 
SynonymEpicrates cenchria alvarezi ABALOS, BAEZ & NADER 1964: 218
Epicrates cenchria alvarezi — FREIBERG 1982
Epicrates cenchria alvarezi — MATTISON 2007: 151
Epicrates alvarezi — PASSOS & FERNANDES 2008
Epicrates alvarezi — WALLACH et al. 2014: 272
Epicrates alvarezi — REYNOLDS & HENDERSON 2018: 20 
DistributionN Argentina, SE Bolivia, W Paraguay (Chcao)

Type locality: Forres, Robles Department, Santiago Del Estero, Argentina.  
Reproductionovoviviparous 
TypesHolotype: IAV (Instituto de Animales Venenosos Jorge Washington Abaloz), adult female, (collection number not given), collected on July 1, 1959 by Cástulo Salvatierra (specimen not examined). 
DiagnosisDiagnosis: Distinguished from all continental Epicrates by having: (1) anterior dorsal scales rows . 40, (2) interrictals . 24, (3) gular scale rows . 10, (4) loreal divided, (5) juxtaposed prefrontals, (6) frontal reduced or absent, (7) symphysial-chinshields contact; (8) maximum length of inverted hemipenis six subcaudals long, (9) inverted hemipenis bifurcates at 4th subcaudal, (10) dorsal ground color gray to grayish brown, (11) anterior portion of nasal bone short. Refer to Tables 6–7 for additional diagnostic features of the continental Epicrates. 
CommentSynonymy mostly after PASSOS & FERNANDES 2008.

Habitat: partly arboreal (Harrington et al. 2018). 
References
  • Abalos, J.W., Baez, E.C., & Nader, R. 1964. Serpientes de Santiago del Estero. Acta Zoologica Lilloana 20: 211-283
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Biswas, A., Ghosh, A., & Agashe, M. 2025. In ‘hot’pursuit: exploring the evolutionary ecology of labial pits in boas and pythons. Proceedings B, 292(2045), 20250199 - get paper here
  • BRIGUERA, VERÓNICA; MARGARITA CHIARA VIGUO y MERCEDES GUTIÉRREZ. 1994. COMUNICACION QUIMICA EN LA BOA ARCO IRIS EPICRATES CENCHRIA ALVAREZI (SERPENTES, BOIDAE). Bol. Asoc. Herp. Argentina 10 (1): 10-11
  • Cacciali, Pier; Norman J. Scott, Aida Luz Aquino Ortíz, Lee A. Fitzgerald, and Paul Smith 2016. The Reptiles of Paraguay: Literature, Distribution, and an Annotated Taxonomic Checklist. SPECIAL PUBLICATION OF THE MUSEUM OF SOUTHWESTERN BIOLOGY, NUMBER 11: 1–373 - get paper here
  • Freiberg, M.A. 1982. Snakes of South America. T.F.H. Publications, Neptune City, NJ, 189 pp. - get paper here
  • Harrington, Sean M; Jordyn M de Haan, Lindsey Shapiro, Sara Ruane 2018. Habits and characteristics of arboreal snakes worldwide: arboreality constrains body size but does not affect lineage diversification. Biological Journal of the Linnean Society 125 (1): 61–71 - get paper here
  • Mattison, Chris 2007. The New Encyclopedia of Snakes. Princeton University Press
  • Mense, Mark 2010. Welche Schlange für mich? Reptilia (Münster) 15 (86): 51-56 - get paper here
  • Passos, Paulo and Ronaldo Fernandes 2008. Revision of the Epicrates cenchria Complex (Serpentes: Boidae). Herpetological Monographs 22 (1): 1-30 - get paper here
  • Reynolds, R. Graham and Robert W. Henderson 2018. Boas of the World (Superfamily Booidae): A Checklist With Systematic, Taxonomic, and Conservation Assessments. Bulletin of the Museum of Comparative Zoology Sep 2018, Vol. 162, No. 1: 1-58. - get paper here
  • Rivera, P.C., Cola, V.D., Martı ́nez, J.J., Gardenal, C.N. and Chiaraviglio, M. 2011. Species Delimitation in the Continental Forms of the Genus Epicrates (Serpentes, Boidae) Integrating Phylogenetics and Environmental Niche Models. PLoS One 6 (9): e22199. doi:10.1371/journal.pone.0022199 - get paper here
  • Scrocchi, G.J.; Moreta, J.C. & Kretzschmar, S. 2006. Serpientes del Noroeste Argento [Jujuy, Salta, Tucumán, Catamarca, La Rioja, Santiago del Estero]. Fundación Miguel Lillo, Tucumán, 178 pp.
  • Smith, P., Maciel, J. ., Redin Hurtado, M. ., Galeano, S. ., Stepan, N. ., Brouard, J.-P. ., Ríos, S. D. ., Ferreira Riveros, M. ., Smith, R. L. ., Owen, M. ., Nicolay, H. ., Derna, R. ., Vera Burró, A. ., Lahaye, T. ., & Cacciali, P. . 2024. Twenty-eight new and significant departmental reptile records for Paraguay Acta Zoológica Lilloana, 347–385 - 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.
  • Winchell, S. 2010. Die Reptilien Argentiniens. Reptilia (Münster) 15 (83): 20-27 - get paper here
 
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