Galapagos Species Database

The Galapagos Species Database shares the information about the species from our Natural History Collections.

Pseudalsophis biserialis (Günther, 1860)

Culebra de Galápagos, Galapagos Snake, Galapagos racer

Galapagos Snake, Seymour Norte. Photo: Paul McFarling, CDF, 2008.
Galapagos Snake, Seymour Norte. Photo: Paul McFarling, CDF, 2008.

Taxonomy

Domain
Eukaryota

Kingdom
Animalia

Phylum
Chordata

Class
Reptilia

Order
Squamata

Family
Dipsadidae

Genus
Pseudalsophis

Species
biserialis

Taxon category: Accepted

Syn.: Alsophis biserialis (GBIF Secretariat, 2021); Herpetodryas biserialis Günther, 1860, Dromicus biserialis fide Uetz & Hošek (2013)

Origin: Endemic

Status

Near threatened

Distribution

Distribution: This species persists on an estimated 448 km2 area in San Cristobal Island and three of the surrounding islets of Floreana Island, but it has been extirpated from Floreana.

References

  • Arteaga, A. Bustamante, L., Vierira, J., Tapia, W., Guayasamin, J.M. (2019) Reptiles of the Galapagos Life on the Enchanted Islands Tropical Herping
  • Bisconti, M. Landini, W., Bianucci, G., Cantalamessa, G., Carnevale, G. Ragaini, L. & Valleri, G. (2001) Biogeographic relationships of the Galapagos terrestrial biota: parsimony analyses of endemicity based on reptiles, land birds and Scalesia land plants. J. Biogeogr. 28: 495-510.
  • Carrillo, E. Aldás, S., Altamirano, M.A., Ayala-Varela, F., Cisneros-Heredia, D.F., Endara, A., Márquez, C., Morales, M., Nogales-Sornosa, F., Salvador, P., Torres, M.L., Valencia, J., Villamarín-Jurado, F., Yánez-Muñoz, M.H. & Zárate, P. (2005) Lista Roja de los Reptiles del Ecuador. Fundación Novum Milenium, UICN-Sur, UICN-Comité Ecuatoriano, Ministerio de Educación y Cultura, Serie Proyecto PEEPE. Quito, 46 pp.
  • Garman, S. (1892) The reptiles of the Galapagos Islands. From the collections of Dr. George Baur. Bulletin Essex Inst. 24: 73-87.
  • GBIF Secretariat (2021) GBIF Backbone Taxonomy. Https://doi.org/10.15468/39omei Accessed via https://www.gbif.org/species/5284517
  • Grehan, J. (2001) Biogeography and evolution of the Galapagos: integration of the biological and geological evidence. Biological Journal of the Linnean Society 74: 267-287.
  • Heller, E. (1903) Reptiles. In Papers from the Hopkins Stanford Galapagos Expedition 1898-1899. Proceedings of the Washington Academy Sciences 5: 39-98.
  • Jiménez-Uzcátegui, G. Milstead, B., Márquez, C., Zabala, J., Buitrón, P., Llerena, A., et al. (2007) Galapagos vertebrates: endangered status and conservation actions. Galapagos Report 2006–2007. Charles Darwin Foundation, Puerto Ayora, p. 104–110.
  • Slevin, J.R. (1935) An account of the reptiles inhabiting the Galápagos Islands. Bulletin New York Zoological Society 38: 1-24.
  • Uetz, P. Hošek, J. (eds.) (2013) The Reptile Database available from http://www.reptile-database.org

You are welcome to download and use the information found in this page, acknowledging its source.

This page should be cited as follows:

"Galapagos Species Database, Pseudalsophis biserialis", dataZone. Charles Darwin Foundation, https://datazone.darwinfoundation.org/en/checklist/?species=17968. Accessed 24 April 2026.