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

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

Type locality: Xucayucan (19°53’47.9” N, 97°28’43.7” W; 1493 m asl), Municipality of Tlatlauquitepec, Puebla, Mexico  
Reproduction 
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: 165). 
Comment 
EtymologyThe specific name is from Latin nigrum, meaning black, alluding at to the coloration of the dorsal and ventral surface.

Sympatry: Diploglossus legnotus Campbell & Camarillo 1994, Scincella silvicola (Taylor 1937) and Geophis sp. 
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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