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Rhinocheilus etheridgei GRISMER, 1990

IUCN Red List - Rhinocheilus etheridgei - Data Deficient, DD

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Higher TaxaColubridae, Colubrinae, Lampropeltini, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common NamesE: Etheridge’s Longnose Snake
G: Etheridges Nasennatter 
SynonymRhinocheilus lecontei etheridgei GRISMER 1990
Rhinocheilus etheridgei — GRISMER 1999
Rhinocheilus lecontei etheridgei — LINER 2007
Rhinocheilus etheridgei — HEIMES 2016: 139
Rhinocheilus etheridgei — JOHNSON et al. 2017 
DistributionMexico (Baja California: Isla Cerralvo)

Type locality: “Arroyo Viejos, at 10 m elevation on the southwestern end of Isla Cerralvo, Baja California Sur, Mexico”.  
Reproductionoviparous. 
TypesHolotype: SDNHM = SDSNH 66294; paratypes SDNHM = SDSNH 66309 
DiagnosisDiagnosis: R. (l.) etheridgei has a red temporal region while that of lecontei is not red. R. etheridgei also has red tongue with gray tips while the tongue of lecontei is black (Heimes 2016: 139). 
CommentSubspecies: GRISMER (1999) elevated Rhinocheilus lecontei etheridgei to full species status based on squamation, but using an evolutionary species concept.MANIER (2004) found that no one subspecies was consistently divergent in all analyses, leading to the conclusion that the three mainland subspecies are not sufficiently distinct to warrant separate subspecies status. The island subspecies, though not always statistically distinct, is geographically separate from other populations and differs in characters related to size. Given the small number of specimens available, a decision regarding its taxonomic status (i.e. elevation to species level) is best deferred until additional specimens can be examined and data on molecular variation can be analysed. 
EtymologyNamed after Richard Emmett Etheridge (16 Sep 1929 - 14 Jan 2019), American herpetologist. See Espinoza & Queiroz for biographical details. 
References
  • Grismer, L. Lee 1990. A new long-nosed snake (Rhinocheilus lecontei) from Isla Cerralvo, Baja California Sur, México. Proceedings of the San Diego Society of Natural History 1990 (4): 1-7
  • Grismer, L. Lee. 1999. An evolutionary classification of reptiles on islands in the Gulf of California, México. Herpetologica 55 (4): 446-469 - get paper here
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Johnson, J. D., L. D. Wilson, V. Mata-Silva, E. García-Padilla, and D. L. DeSantis. 2017. The endemic herpetofauna of Mexico: organisms of global significance in severe peril. Mesoamerican Herpetology 4(3): 544–620
  • 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
  • Manier, M.K. 2004. Geographic variation in the Long-nosed Snake, Rhinocheilus lecontei (Colubridae): Beyond the subspecies debate. Biological Journal of the Linnaean Society 83(1): 65-85 - get paper here
  • Vyas, Raju 2007. Present conservation scenario of reptile fauna in Gujarat State, India. Indian Forester, Oct 2007: 1381-1394 - get paper here
 
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