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Chironius leucometapus DIXON, WIEST & CEI, 1993

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Higher TaxaColubridae, Colubrinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Yellow-headed Sipo 
SynonymChironius fuscus leucometapus WIEST 1978
Chironius fuscus leucometapus DIXON, WIEST & CEI 1993
Chironius leucometapus — HOLLIS 2006
Chironius leucometapus — SOUZA-FILHO et a. 2012
Chironius leucometapus — WALLACH et al. 2014: 161 
DistributionN Ecuador, Peru (Huanuco, Junin, San Martin), 500–3500 m elevation

Type locality: “Peru, Depanmenl of Junin, Chanchamayo”  
TypesHolotype: AMNH 53317 
DiagnosisDiagnosis: “has a while or dirty yellow forehead, without a dark postocular stripe, and without enlarged spines proximally in the spinous portion of the hemipenis” [DIXON et al. 1993: 125].
CommentDistribution: see map in DIXON et al. 1993: 111.

Synonymy: Wiest published the description of C. dixoni in his PhD thesis, which was later published again in slighly modified form by Dixon et al. 1993. Entiauspe-Neto & Loebmann 2019 argued that Wiest 1978 constitutes a proper publication and thus has priority over Dixon et al. 1993.

Habitat: partly arboreal (Harrington et al. 2018). 
EtymologyNamed after Latin “fuscus”, meaning dark or dusky. 
  • Dixon J R; Wiest J A Jr; Cei J M 1993. Revision of the Neotropical snake genus Chironius Fitzinger (Serpentes, Colubridae). MUSEO REGIONALE DI SCIENZE NATURALI MONOGRAFIE (TURIN) 13 :1-280
  • Entiauspe-Neto OM, Loebmann D 2019. Taxonomic status of Chironius laurenti Dixon, Wiest & Cei, 1993 and of the long- forgotten Chironius dixoni Wiest, 1978 (Squamata, Serpentes). Bionomina 16: 83–87 - 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
  • Hollis, J.L. 2006. Phylogenetics of the genus Chironius Fitzinger 1826 (Serpenes, Colubridae) based on morphology. Herpetologica 62 (4): 435-452 - get paper here
  • Roberto, I. J. and Souza, A. R. 2020. Review of prey items recorded for snakes of the genus Chironius (Squamata, Colubridae), including the first record of Osteocephalus as prey. Herpetology Notes 13: 1-5. - get paper here
  • Souza Filho, G.A.; J.C. Moura-Leite; Matias, E.G.; S.A.A. Morato 2012. Chironius fuscus (Linnaeus, 1758) (Serpentes: Colubridae): Distribution extension, new state record and variation in southern Brazil. Check List 8(6):1315-1318 - get paper here
  • Torres-Carvajal, O., Echevarría, L.Y., Lobos, S.E., Venegas, P.J., Kok, P.J.R. 2018. Phylogeny, diversity and biogeography of Neotropical sipo snakes (Serpentes: Colubrinae: Chironius). Molecular Phylogenetics and Evolution 130: 315-329 - get paper here
  • Torres-Carvajal, Omar; Claudia Koch, Jorge H. Valencia, Pablo J. Venegas, and Lourdes Y. Echevarría 2019. Morphology and distribution of the South American snake Chironius leucometapus (Serpentes: Colubridae). Phyllomedusa 18 (2): 241–254 - 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.
  • Wiest, J. A., Jr. 1978. Revision of the Neotropical snake genus Chironius Fitzinger (Serpentes, Colubridae). PhD. dissertation, Texas A&M University: i–xv + 1–370
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