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Dipsas vagrans (DUNN, 1923)

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Dunn's Tree Snake 
SynonymPseudopareas vagrans DUNN 1923: 187
Pseudopareas vagrans — MARX 1958
Sibynomorphus vagrans — PETERS 1960: 161
Sibynomorphus vagrans — CADLE 2007
Sibynomorphus vagrans — WALLACH et al. 2014: 671
Dipsas vagrans — ARTEAGA et al. 2018 
DistributionPeru (Cajamarca)

Type locality: Bellavista, Peru  
TypesHolotype: MCZ 17284 
DiagnosisDiagnosis: CADLE 2007.
CommentSibynomorphus vagrans is known only from the type series collected by G. K. No-

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

Habitat: fully arboreal (Harrington et al. 2018). 
EtymologyDunn (1923: 187) did not elaborate on the meaning of his species epithet, saying only that Sibynomorphus vagrans was ‘‘a species closely allied to [S. vagus] but quite distinct.’’ To reflect his supposition that the two species were closely related, Dunn might have used the name vagrans (originally of Anglo-French and Germanic origin) because it is a latinized cognate associated with the Latin word vagus (meaning wandering or roaming or indefinite; from vagor, to wander). However, the color pattern of S. vagrans bears little resemblance to that of S. vagus. 
  • 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
  • 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
  • Dunn, E. R. 1923. Some snakes from North Western Peru. Proc. Biol. Soc. Washington 36: 185-188 - 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
  • Marx,H. 1958. Catalogue of type specimens of reptiles and amphibians in Chicago Natural History Museum. Fieldiana Zool. 36: 407-496 - get paper here
  • Peters , J. A. 1960. The snakes of the subfamily Dipsadinae. Misc. Publ. Mus. Zool., Univ. Michigan (114): 224 pp. - 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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