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Pseudalsophis occidentalis (VAN DENBURGH, 1912)

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Higher TaxaColubridae (Dipsadinae), Alsophiini, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Common Names 
SynonymDromicus occidentalis VAN DENBURGH 1912: 347
Dromicus occidentalis helleri VAN DENBURGH 1912: 349
Dromicus dorsalis occidentalis — MERTENS 1960: 139
Dromicus dorsalis helleri — MERTENS 1960: 138
Alsophis biserialis occidentalis — THOMAS 1997: 36
Alsophis dorsalis occidentalis — SWASH & STILL 2000
Alsophis dorsalis helleri — SWASH & STILL 2000
Pseudalsophis occidentalis — ZAHER et al. 2009
Pseudalsophis occidentalis — WALLACH et al. 2014: 595 
DistributionEcuador (Galapagos Islands: Fernandina, Isabela, Tortuga)

Type locality: “Narborough Island, Galapagos Archipelago” [= Fernandina Island, Galapagos Islands, Ecuador].  
TypesHolotype: CAS 11488 (occidentalis)
Holotype: CAS 10280 [helleri] 
DiagnosisDiagnosis [helleri]: Scale-pits present, scales in 19 rows; gastrosteges more than 236; postoculars two; temporals 1+2 or 2+2, spotted, no longitudinal light stripes; no series of definite rounded blackish spots on lateral scales of first and second
rows; light nuchal markings much less prominent, and dark spots on tips of gastrosteges absent or less distinct than in the Narborough form [from VAN DENBURGH 1912].

Diagnosis [occidentalis]: Scale-pits present; scales in 19 rows; gastrosteges 236 to 252; postoculars two; temporals 1+1 or 1+2; striped (or rarely spotted), light nuchal blotches and series of dark spots on tips of gastrosteges and on lower lateral scales very distinct [from VAN DENBURGH 1912]. 
CommentSynonymy: after Wallach et al. 2014. 
EtymologyThe specific name occidentalis (Latin) refers to the western distribution of this species. 
  • Mertens, Robert 1960. Über die Schlangen der Galapagos Inseln. Senckenbergiana Biologica 41 (3/4): 133-141
  • Swash, A. & Still, R. 2000. Birds, Mammals and Reptiles of the Galapagos Islands. Pica Press, 168 pp.
  • Thomas, Robert A 1997. Galapagos terrestrial snakes: biogeography and systematics. Herpetological Natural History 5 (1): 19-40
  • Van Denburgh, John 1912. Expedition of the California Academy of Sciences to the Galapagos Islands, 1905-1906. IV. The snakes of the Galapagos Islands. Proc. Cal. Acad. Sci. (Ser. 4) 1: 323-374 - 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.
  • Zaher, Hussam; Grazziotin, Felipe Gobbi; Cadle, John E.; Murphy, Robert W.; Moura-Leite, Julio Cesar de; Bonatto, Sandro L 2009. Molecular phylogeny of advanced snakes (Serpentes, Caenophidia) with an emphasis on South American Xenodontines: a revised classification and descriptions of new taxa. Pap. Avulsos Zool. (São Paulo) 49 (11): 115-153 - get paper here
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