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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common Names 
DistributionMexico (Puebla)

Type locality: Xucayucan (19°53’47.9” N, 97°28’43.7” W; 1493 m asl), Municipality of Tlatlauquitepec, Puebla, Mexico  
TypesHolotype: MZFC 17619, adult male, (field no. ISZ 063), collected by Israel Solano Zavaleta on May 28 2005. Paratypes. UTA R-63417, Juvenile female (field number UOGV 062; Fig. 9 A) collected by Uri Omar García Vázquez on February 25 2002 at 5.5 km east from Tahitic (19° 55’ 33.9” N, 97° 31’ 42.4” W; 1530 m asl), Municipality of Zacapoaxtla, Puebla, Mexico; and an adult female MZFC 17661 (field number ISZ 059), same provenance as the holotype, obtained dead on road on May 27 2005. 
DiagnosisDiagnosis: Chersodromus nigrum can be distinguished from all Mexican species of snakes by having combination of prefrontals fused into single scale; postocular fused with supraocular; single anterior temporal present; dorsal scales keeled in 17 rows at midbody, unreduced posteriorly; supralabials 6, third and fourth entering orbit; infralabials 8, 1–5 contacting anterior chinshields); mental contacting anterior chinshields; venter mostly black.
This species is characterized by its large size (260-315 mm SVL). It differs from Chersodromus rubriventris and C. australis by having fused supraocular and postocular scales; distinguished from C. australis and usually C. liebmanni by having first 5 or 6 infralabials in contact with anterior chinshield (vs. 4–5), further differing from C. liebmanni by having six supralabials (vs. seven) (Table 1 in Canseco-Márquez et al. 2018: 162). 
CommentSympatry: Diploglossus legnotus Campbell & Camarillo 1994, Scincella silvicola (Taylor 1937) and Geophis sp. 
EtymologyThe specific name is from Latin nigrum, meaning black, alluding at to the coloration of the dorsal and ventral surface. 
  • 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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