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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) 
Subspecies 
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.  
Reproductionoviparous 
TypesType: LSUMZ 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." 
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
  • Dixon, James R. and Julio A. Lemos-Espinal 2010. Amphibians and reptiles of the state of Queretaro, Mexico. Tlalnepantla UNAM, 428 pp.
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Lemos-Espinal, Julio A. and James R. Dixon 2013. Amphibians and Reptiles of San Luis Potosí. Eagle Mountain Publishing, xii + 300 pp.
  • Lemos-Espinal, Julio A., Geoffrey R. Smith 2015. Amphibians and reptiles of the state of Hidalgo, Mexico. Check List 11 (3): 1642 - get paper here
  • Liner, Ernest A. 2007. A CHECKLIST OF THE AMPHIBIANS AND REPTILES OF MEXICO. Louisiana State University Occasional Papers of the Museum of Natural Science 80: 1-60 - get paper here
  • O’Shea, M. 2018. The Book of Snakes. Ivy Press / Quarto Publishing, London, - get paper here
  • Taylor,E.H. 1949. A preliminary account of the herpetology of the state of San Luis Potosi, Mexico. Univ. Kansas Sci. Bull. 33 (2): 169-215 - 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.
 
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