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Dipsas vagus (JAN, 1863)

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Jan's Tree Snake 
SynonymLeptognathus vagus JAN 1863: 100
Leptognathus vaga — COPE 1868: 136
Pareas vagus — BOETTGER 1888: 145.
Pseudopareas vagus — BOULENGER 1896: 462
Pseudopareas vagus — WERNER 1922: 200
Pseudopareas vagus — DUNN 1923: 187
Pseudopareas vagus vagus — AMARAL ‘‘1929’’a [1930]: 33
Pseudopareas vagus vagus — AMARAL ‘‘1929’’b [1930]: 201
Pseudopareas vagus vagus — AMARAL ‘‘1929’’c [1930]: 75
Sibynomorphus vagus — PETERS 1960: 164
Sibynomorphus vagus — LEHR et al. 2002
Sibynomorphus vagus — CADLE 2007
Sibynomorphus vagus — WALLACH et al. 2014: 671
Dipsas vagus — ARTEAGA et al. 2018 
DistributionPeru (Piura: Huancabamba), elevation 1,810 to 1,920 m.

Type locality: Hong Kong (in error, designated as South America by Dunn 1923: 187)  
TypesHolotype: MSNM (Museo Civico di Storia Naturale, Milan) (probably destroyed during the bombing of 1943). 
DiagnosisDiagnosis in Cadle 2007. 
CommentSynonymy that of PETERS & OREJAS-MIRANDA 1970

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

Habitat: fully arboreal (Harrington et al. 2018). 
EtymologyNamed after Latin “vagus” = wandering or roaming. However, the word can also mean diffuse or indefinite (as in vague). Cadle (2007) suspects that this is a reference to the diffuse dorsal pattern of Sibynomorphus vagus compared with other species of Leptognathus known at the time of its description—as seen especially by comparing the illustration of S. vagus with the other species illustrated on the same plate by Jan and Sordelli (1860–1881): Dipsas incerta, S. mikanii, and the Asian colubrid Pareas laevis (all in the genus Leptognathus at the time); these are much more boldly marked than S. vagus. 
  • Aguilar, César; Mikael Lundberg, Karen Siu-Ting y María Elena Jiménez 2007. Nuevos registros para la herpetofauna del departamento de Lima, descripción del renacuajo de Telmatobius rimac Schmidt, 1954 (Anura: Ceratophrydae) y una clave de los anfibios. Rev. peru. biol. 14(2): 209-216 - get paper here
  • Amaral, A. do 1929. Contribuicao ao conhecimento dos ophidios do Brasil. IV. Lista remissiva dos ophidios do Brasil. Mem. Inst. Butantan, Sao Paulo, 4: 71-125 - get paper here
  • Amaral, A. do 1930. Estudos sobre ophidios neotropicos XVII. Valor systematico de varias formas de ophidios neotropicos. Mem. Inst. Butantan 4: 1-68 [1929] - get paper here
  • Amaral,A. do 1930. Estudos sobre ophidios neotropicos XVIII. Lista remissiva dos ophidios da região neotropica. Mem. Inst. Butantan 4: 126-271 [1929] - get paper here
  • 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
  • Boettger, O. 1888. Materialien zur herptologischen Fauna von China. II. Ber. Offenbach. Ver. Naturk. 26-28: 53-176 - get paper here
  • Boulenger, G.A. 1896. Catalogue of the snakes in the British Museum, Vol. 3. London (Taylor & Francis), xiv + 727 pp. - 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
  • Jan, G. 1863. Elenco Sistematico degli Ofidi descriti e disegnati per l'Iconografia Generale. Milano, A. Lombardi. vii + 143 pp. - get paper here
  • Lehr, E. 2002. Amphibien und Reptilien in Peru. Natur und Tier-Verlag (Münster), 208 pp. - get paper here
  • Lehr, E.; Köhler, G. & Streit, B. 2002. Die Herpetofauna von Mittelperu entlang eines Transektes von der pazifischen Küste bis in die Hochanden (Amphibia et Reptilia). Faun. Abh. Mus. Tierk. Dresden 22 (2): 361-392
  • Peters , J. A. 1960. The snakes of the subfamily Dipsadinae. Misc. Publ. Mus. Zool., Univ. Michigan (114): 224 pp. - 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.
  • Werner,F. 1922. Synopsis der Schlangenfamilien der Amblycephalidae und Viperidae nebst Uebersicht über die kleineren Familien und die colubriden der Acrochordinengruppe auf Grund des Boulengerschen Schlangenkatalogs (1893-1896). Archiv für Naturgeschichte 8A: 185-244
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