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Dipsas oneilli (ROSSMAN & THOMAS, 1979)

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: O'Neill's Tree Snake 
SynonymSibynomorphus oneilli ROSSMAN & THOMAS 1979
Sibynomorphus oneilli — CADLE 2007
Sibynomorphus oneilli — WALLACH et al. 2014: 670
Dipsas oneilli — ARTEAGA et al. 2018 
DistributionPeru (from the northern end of the Cordillera Oriental in extreme southern Amazonas Department, Peru, and in the Cordillera Occidental from southern Ancash to southern
Cajamarca Department), elevation 1646-3500 m.

Type locality: ‘‘NNE Balsas on the road to Abra Chanchillo, Departamento de Amazonas, Peru (ca. 1645 m [elevation]).’’  
Reproductionoviparous 
TypesHolotype: LSUM 33736 
DiagnosisDiagnosis: Cadle 2007. 
CommentSibynomorphus oneilli has been reported in the literature from only two males
(including the juvenile male holotype) and a female (Rossman and Kizirian, 1993). Cadle (2007) refers an additional 14 specimens to this species.

Diet: primarily molluscs (T. de Lema, pers. comm., 16 Oct 2015).

Habitat: fully arboreal (Harrington et al. 2018). 
EtymologyNamed after John P. O'Neill (b. 1942), an American field ornithologist and artist. 
References
  • Arteaga A, Salazar-Valenzuela D, Mebert K, Peñafiel N, Aguiar G, Sánchez-Nivicela JC, Pyron RA, Colston TJ, Cisneros-Heredia DF, Yánez-Muñoz MH, Venegas PJ, Guayasamin JM, Torres-Carvajal O 2018. Systematics of South American snail-eating snakes (Serpentes, Dipsadini), with the description of five new species from Ecuador and Peru. ZooKeys 766: 79-147 - get paper here
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Cadle, J.E. 2007. The snake genus Sibynomorphus (Colubridae: Dipsadinae: Dipsadini) in Peru and Ecuador, with comments on the systematics of Dipsadini. Bull. Mus. Comp. Zool. Harvard 158(5):183-283 - 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
  • KOCH, CLAUDIA; PABLO J. VENEGAS, ROY SANTA CRUZ, WOLFGANG BÖHME 2018. Annotated checklist and key to the species of amphibians and reptiles inhabiting the northern Peruvian dry forest along the Andean valley of the Marañón River and its tributaries. Zootaxa 4385 (1): 001–101 - get paper here
  • Rossman D A; Thomas R 1979. A new dipsadine snake of the genus Sibynomorphus from Peru. OCCASIONAL PAPERS OF THE MUSEUM OF ZOOLOGY LOUISIANA STATE UNIVERSITY (No. 54): 1-6 - get paper here
  • Rossman, D. A.; Kizirian, D. A. 1993. Variation in the peruvian dipsadine snakes Sibynomorphus oneilli and S. vagus. Journal of Herpetology 27 (1): 87-90 - 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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