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Chersodromus rubriventris (TAYLOR, 1949)

IUCN Red List - Chersodromus rubriventris - Endangered, EN

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Common NamesRedbelly Earth Runner 
SynonymSchmidtophis rubriventris TAYLOR 1949
Chersodromus rubriventris — LINER 1994
Chersodromus rubriventris — LINER 2007
Chersodromus rubriventris — WALLACH et al. 2014: 159 
DistributionMexico (Querétaro, Hidalgo, San Luis Potosí), elevation 700–1650 m

Type locality: near Xilitla (Xilitla Region) San Luis Potosi, Mexico.  
TypesType: LSUM R. 577, Louisiana State University. Collected by Charles Shaw. 
DiagnosisDiagnosis: Characters of the genus. A very broad rostral one third broader than high, one subtriangular supraocular; one postocular much higher than long; frontal as long as its distance from intemasals; body scales lightly keeled, save entire outer row, and part of second row; no primary temporal. Body black, venter pink, a white band across middle of parietals joining the white of throat. Scales in 15 rows; 6-6 supralabials. Ventrals, 125, caudals, 41 (from TAYLOR 1949).

Diagnosis. Chersodromus rubiventris can be distinguished from all Mexican species of snakes by having combination of prefrontals fused into single scale; postocular discrete from supraocular; anterior temporal absent; dorsal scales keeled in 15 rows at midbody, unreduced posteriorly; supralabials usually 6, third and fourth entering orbit; infralabials 7–8, usually 1–5 contacting anterior chinshields (5 narrowly); mental not contacting anterior chinshields; venter bright red.
This species is easily differentiated from all species of Chersodromus by having 15 scales around body, mental scale in contact with anterior chinshields and anterior temporal absent (Table 1 in Canseco-Márquez et al. 2018: 165). 
CommentHabitat: cloud forest

Conservation: IUCN: endangered (En) 
EtymologyThe specific name is from the Latin words rubra, meaning "red" and venter, meaning "belly or venter." 
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