| Higher Taxa | Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)  | 
        | Subspecies |   | 
        | Common Names |   | 
        | Synonym | Sibynomorphus oligozonatus ORCÉS & ALMENDÁRIZ 1989 Sibynomorphus oligozonatus — CADLE 2007 Sibynomorphus oligozonatus — WALLACH et al. 2014: 670 Dipsas oligozonatus — ARTEAGA et al. 2018  | 
        | Distribution | Ecuador
  Type locality:  ‘‘Zhila (2,250 m) 79°17’26”W, 03°39’45”S, parroquia Oña, cantón Girón, Provincia Azuay [Ecuador].’’
          | 
        | Reproduction | oviparous  | 
        | Types | Holotype: MEPN (also as EPN) 3612; additional specimens in AMNH, BMNH, MUSM  | 
        | Diagnosis | Diagnosis: Cadle 2007.  | 
        | Comment | Only known from the holotype.
  Synonymy: Maybe a synonym of S. vagrans (fide SCROCCHI et al. 1993). Not listed in Zoological Record.
  Distribution: not in Peru fide IUCN assessment.
  Diet: primarily molluscs (T. de Lema, pers. comm., 16 Oct 2015).
  Habitat: fully arboreal (Harrington et al. 2018).  | 
        | Etymology | Named after Greek oligos (ὀλίγος), little, small, insignificant + Latin zonata, encircling band/marking. [“...El nombre, tomado del griego, se refiere a las escasas fajas transversas, mucho menos numerosas de lo que es usual en el género...”]. (from Esteban Lavilla, pers. comm., May 2024)  | 
        | 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
 
            
            - Arteaga, A.; Bustamante, L.; Vieira, J. 2024. Reptiles of Ecuador. Khamai Foundation & Tropical Herping, 1073 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
 
            
            - 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
 
            
            - Orces V., G. & A. Almendariz. 1989. Presencia en el Ecuador de los Colubridos del Genero Sibynomorphus. Rev. Politecnica, Vol. XIV, No. 2: 57-67. 
 
            
            - 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
 
            
            - Scrocchi G.  Porto M.  Rey L. 1993. Descripcion de una especie nueva y situacion del genero Sibynomorphus (Serpentes: Colubridae) en la Argentina. REVISTA BRASILEIRA DE BIOLOGIA 53 (2): 197- 208. 
 
            
            - Torres-Carvajal O, Pazmiño-Otamendi G, Salazar-Valenzuela D. 2019. Reptiles of Ecuador: a resource-rich portal, with a dynamic checklist and photographic guides. Amphibian & Reptile Conservation 13 (1): [General Section]: 209–229 (e178)  - 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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