Bulletin of the Museum of Comparative Zoology. "Boas of the World (Superfamily Booidae): A Checklist With Systematic, Taxonomic, and Conservation Assessments".
"The role of the environment on the genetic divergence between two Boa imperator lineages". Vázquez-Domínguez, Ella (September 2017). ^ a b c Suárez-Atilano, Marco Rojas-Soto, Octavio Parra, Juan L."Phylogeographical structure within Boa constrictor imperator across the lowlands and mountains of Central America and Mexico". ^ Suárez-Atilano, Marco Burbrink, Frank Vázquez-Domínguez, Ella (December 2014).Ramírez-Silva, Juan Pablo Woolrich-Piña, Guillermo A. "An updated checklist of the herpetofauna from Isla María Cleofas, Mexico". ^ Nolasco-Luna, Jose Rafael Barraza-Soltero, Ilse K."Phylogeographic and population genetic analyses reveal multiple species of Boa and independent origins of insular dwarfism" (PDF). Proceedings of the United States National Museum. "Summary of the collections of snakes and crocodilians made in Mexico under the Walter Rathbone Bacon Traveling Scholarship".
Unlike other snakes, Boa sigma is protected by rural Sonorans, because it is thought that killing the boa would cause the spring ( aguaje) to dry up. In eastern and southern Sonora, it is widely believed that Boa sigma, locally known as corúa, corúga, corúva, culebrón or limacoa, is the guardian of water ( guardiana del agua). In Oaxaca, there is a contact zone between these two species, but it's unclear whether or not hybridization occurs there. īased on species distribution modelling, Boa sigma lives mainly within the tropical dry forest ecoregion, whereas Boa imperator seems to prefer areas with more precipitation. Within the distribution range of Boa sigma, the three islands of the Islas Marías are included: María Madre, María Magdalena and María Cleofas. The northernmost records are from Sonora, where the species can reach altitudes of 1,420 metres (4,659 ft). Distribution and habitat īoa sigma is distributed along the Pacific Coast of Mexico west of the Isthmus of Tehuantepec. Both divergence dates could be explained with the rise of biogeographical barriers. (2016) found the divergence date of these lineages, which they recognized as Boa imperator and Boa sigma, to be around 14 Ma. (2014) identified two lineages of Boa imperator with a divergence date of about 5.2 Ma. Despite this uncertainty, Boa sigma has been widely accepted as a valid species. didn't include samples from the Islas Marías, from where the holotype and the paratypes were collected. However, further research is needed because the genetic study of Card et al. (2016), the name Boa sigma is available for this third species. First, Boa constrictor imperator was elevated to species level, but it was soon recognized that there was another species nested within the new species Boa imperator. In the 21st century, genetic studies revealed that Boa constrictor is a species complex. The subspecies only included snakes from the Islas Marías, and it did not receive wide recognition instead, it was synonymized with the mainland subspecies Boa constrictor imperator by many authors. Boa sigma has previously been regarded as conspecific with Boa constrictor, and later with Boa imperator however, in 2016, it was suggested on genetic grounds that Boa sigma should be regarded as a separate species.īoa sigma was originally described as Constrictor constrictor sigma by Hobart Muir Smith in 1943. The species is endemic to western Mexico. Constrictor constrictor sigma Smith, 1943īoa sigma, known commonly as the Mexican west coast boa constrictor, is a species of snake in the family Boidae.
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