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Sibon longifrenis (STEJNEGER, 1909)

IUCN Red List - Sibon longifrenis - Least Concern, LC
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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Stejneger's Snail Sucker, Lichen-colored Snail Sucker 
SynonymMesopeltis longifrenis STEJNEGER 1909
Leptognathus longifrenis — WERNER 1910: 284
Dipsas costaricensis TAYLOR 1951
Sibon longifrenis — MCCRANIE et al. 2001
Sibon longifrenis — WALLACH et al. 2014: 668
Sibon longifrenis — SUNYER & MARTÍNEZ-FONSECA 2023 
DistributionPanama, Costa Rica, Honduras (McCranie et al. 2001), Nicaragua

Type locality: Bocas del Toro, Isla de Colon, Prov. Bocas del Toro, Panama.  
Reproductionoviparous 
TypesHolotype: USNM 38750 
DiagnosisUnfortunately we had to temporarily remove additional information as this was scraped by multiple AI companies who sell that data to their customers. These details, e.g. detailed descriptions or comparisons (about 29 characters), are available for collaborators and contributors. Please contact us for details. 
CommentSynonymized with S. dimidiata by KOFRON 1990 (since some of KOFRON’s synonymizations weren’t followed by other authors we keep longifrenis separate too for the time being).

Habitat: fully arboreal (Harrington et al. 2018). 
EtymologyNamed after Latin longi-, long + Latin frenis, rein or bridle. [“...third, fourth, and fifth labials marked with whitish...”]. 
References
  • Abarca, Juan G.; Diego A. Gómez Hoyos, Rocío Seisdedos-de-Vergara, and Alejandro Quesada Murillo 2019. Defensive behavior in Stejneger’s Snail Sucker, Sibon longifrenis (Serpentes: Dipsadidae). IRCF Reptiles & Amphibians 26 (2): 100–101 - get paper here
  • Baaijen, Wouter, Daniel Ramírez-Arce, Jonathan Vegacota, Ajejandro Zúñiga, Katherine González and Jorge M. De La O. 2015. Sibon longifrenis (drab snail-eater) aggregation. Herpetological Review 46 (4): 649-650 - 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
  • Hilje B, Chaves G, Klank J, Timmerman F, Feltham J, Gillingwater S, Piraino T, Rojas E 2020. Amphibians and Reptiles of the Tirimbina Biological Reserve: a baseline for conservation, research and environmental education in a lowland tropical wet forest in Costa Rica. Check List 16(6): 1633-1655 - get paper here
  • JUSTINEK, UWE 2020. Für 6 Tage auf Schlangensuche in Costa Rica. Ophidia 14 (1): 15-26
  • Köhler, G. 2008. Reptiles of Central America. 2nd Ed. Herpeton-Verlag, 400 pp.
  • Köhler, Gunther, Joseph Vargas, Johannes J. Köhler and Milan Vesel´y. 2013. Noteworthy distributional records of amphibians and reptiles from Costa Rica. Herpetological Review 44 (2): 280-283 - get paper here
  • Köhler, Gunther, Sebastian Lotzkat and Andreas Hertz. 2010. A new species of Sibon (Squamata: Colubridae) from western Panama. Herpetologica 66 (1): 80-85 - get paper here
  • Lewis, T.R. 2009. Sibon longifrenis (drab snail-eater) reproduction. Herpetological Review 40 (1): 103 - get paper here
  • Lewis, Todd R.; Rowland K. Griffin, Paul B. C. Grant, Alex Figueroa, Julie M. Ray, Kirsty E. Graham, and Gabriel David 2013. Morphology and ecology of Sibon snakes (Squamata: Dipsadidae) from two Neotropical forests in Mesoamerica. Phyllomedusa 12 (1): 47-55 - get paper here
  • Lotzkat, S.; A. Hertz; G. Köhler. 2012. A new species of Sibon (Squamata: Colubroidea: Dipsadidae) from the Cordillera Central of western Panama, with comments on other species of the genus in the area. Zootaxa 3485: 26–40 - get paper here
  • McCranie, James R. 2015. A checklist of the amphibians and reptiles of Honduras, with additions, comments on taxonomy, some recent taxonomic decisions, and areas of further studies needed. Zootaxa 3931 (3): 352–386 - get paper here
  • McCranie,J.R.; Wilson,L.D. & Gotte,S.W. 2001. Three new country records for Handuran snakes. Herpetological Review 32: 62-63 - get paper here
  • O’Shea, M. 2018. The Book of Snakes. Ivy Press / Quarto Publishing, London, - 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
  • Ray, Julie M. and Patty Ruback 2015. Updated checklists of snakes for the provinces of Panamá and Panamá Oeste, Republic of Panama. Mesoamerican Herpetology 2 (2): 168-188 - get paper here
  • Ray, Julie M.; Chad E. Montgomery, Heidi K. Mahon, Alan H. Savitzky, and Karen R. Lips 2012. Goo-Eaters: Diets of the Neotropical Snakes Dipsas and Sibon in Central Panama. Copeia 2012 (2): 197-202. - get paper here
  • Sasa, M., Arias, E., & Chaves, G. 2025. Annotated list of amphibians and reptiles of Costa Rica: The role of the Museum of Zoology in cataloging the country’s herpetological diversity. Revista de Biología Tropical, 73(S2): e64536-e64536 - get paper here
  • Savage, J.M. 2002. The Amphibians and Reptiles of Costa Rica: A Herpetofauna Between Two Continents, Between Two Seas. University of Chicago Press, 934 pp. [review in Copeia 2003 (1): 205]
  • Savage,J.M. & McDiarmid,R.W. 1992. Rediscovery of the Central American colubrid snake, Sibon argus, with comments on related species from the region. Copeia 1992 (2): 421-432 - get paper here
  • Solís, J. M., L. D. Wilson, and J. H. Townsend. 2014. An updated list of the amphibians and reptiles of Honduras, with comments on their nomenclature. Mesoamerican Herpetology 1: 123–144 - get paper here
  • Solorzano, A. 2004. Serpientes de Costa Rica - Snakes of Costa Rica. Editorial INBio, Costa Rica, 792 pp.
  • Stejneger, L. 1909. Description of a new snake from Panama. Proc. US Natl. Mus. 36: 457-458 - get paper here
  • Sunyer, Javier 2014. An updated checklist of the amphibians and reptiles of Nicaragua. Mesoamerican Herpetology 1 (2): 186–202. - get paper here
  • Sunyer, Javier & José́ Gabriel Martínez-Fonseca 2023. An updated country checklist to the amphibians and reptiles of Nicaragua. REVISTA NICARAGÜENSE DE BIODIVERSIDAD (100): 1-25 - get paper here
  • Taylor,E.H. 1951. A brief review ot the snakes of Costa Rica. Univ. Kansas Sci. Bull. 34 (1): 3-188 - get paper here
  • VERA-PÉREZ, LUIS ENRIQUE 2019. A new species of Sibon Fitzinger, 1826 (Squamata: Colubridae) from Southwestern Colombia. Zootaxa 4701 (5): 443–453 - 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. 1910. Neue oder seltenere Reptilien des Musée Royal d'Histoire Naturelle de Belgique in Brüssel. [Mabuia dolloi, Mabuia polylepis]. Zool. Jb. Abt. Syst. Okol. Geogr. 28 [1909]: 263-288. - get paper here
  • Zipkin, Elise F.; Graziella V. DiRenzo, Julie M. Ray, Sam Rossman, Karen R. Lips 2020. Tropical snake diversity collapses after widespread amphibian loss. Science 367: 814–816 - get paper here
 
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