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Chersodromus australis CANSECO-MÁRQUEZ, RAMÍREZ-GONZÁLEZ & CAMPBELL, 2018

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common Names 
SynonymChersodromus australis CANSECO-MÁRQUEZ, RAMÍREZ-GONZÁLEZ & CAMPBELL 2018 
DistributionMexico (Oaxaca)

Type locality: San Isidro La Gringa (17°04.591 ́ N, 94°03.844’ W; 350 m asl), Municipality of Santa María Chimalapa, Oaxaca, Mexico  
Reproduction 
TypesHolotype: MZFC 17618, An adult female, (field number EPR 388), collected by Edmundo Pérez Ramos on June 27 1995. 
DiagnosisDiagnosis. Chersodromus australis can be distinguished from all Mexican species of snakes by having combination of prefrontals fused into single scale; postocular discrete from supraocular; single anterior temporal present; dorsal scales keeled in 17 rows at midbody, unreduced posteriorly; supralabials usually 6, third and fourth entering orbit; infralabials 7–8, usually 1–4 contacting anterior chinshields); mental contacting anterior chinshields; ventral surface of body cream colored.
Chersodromus australis differs of C. rubriventris by having 17 scales around body (vs. 15), by having eight infralabials (vs. six or seven), by having a cream colored belly (vs. orange), and by having the mental in contact with first pair of chinshields (vs. not in contact). Chersodromus australis differs from C. liebmanni by having six supralabials (vs. seven), and from the new species that follows by having a dark belly (vs. cream-colored) and in having four infralabials contacting anterior chinshields (vs. five or six) (Table 1 in Canseco-Márquez et al. 2018: 165). 
Comment 
EtymologyThe specific name is derived from the Latin australis, meaning southern, alluding to the southernmost distribution of species for the genus.

Sympatry: Norops pygmaeus (Álvarez del Toro & Smith 1956), Lepidophyma tuxtlae Werler & Shannon 1957, Bothrops asper (Garman 1884), and Tantillita lintoni (Smith 1940). 
References
  • CANSECO-MÁRQUEZ, LUIS; CYNTHIA G. RAMÍREZ-GONZÁLEZ, JONATHAN A. CAMPBELL 2018. Taxonomic review of the rare Mexican snake genus Chersodromus (Serpentes: Dipsadidae), with the description of two new species. Zootaxa 4399 (2): 151–169 - get paper here
 
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