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Hypsiglena tanzeri DIXON & LIEB, 1972

IUCN Red List - Hypsiglena tanzeri - Data Deficient, DD

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Rio Verde Nightsnake, Tanzer's Night Snake
S: Nocturna de Tanzer 
SynonymHypsiglena tanzeri DIXON & LIEB 1972: 2
Hypsiglena tanzeri — LINER 1994
Hypsiglena tanzeri — LINER 2007
Hypsiglena tanzeri — MULCAHY 2008
Hypsiglena tanzeri — WALLACH et al. 2014: 343 
DistributionMexico (San Luis Potosí, Hidalgo, Guanajuato)

Type locality: "5 km E. Jalpan, Querétaro, Mexico, 762 m, 99° 27' W., 21°13' N."  
TypesHolotype: TCWC 34079, a 328 mm male (F. Guyer, 13 April 1971). 
DiagnosisDiagnosis: Hypsiglena tanzeri is readily distinguished from populations of snakes that have been referred to H. ochrorhyncha by possessing a broad nuchal collar. It most closely resembles H. torquata from which it is readily distinguished by the presence of wider (usually reaching the second dorsal scale row) and longer (usually 3 to 4 scales long) brown to black bands on the anterior two-thirds of the body. H. torquata has dorsal blotches reaching the sixth or seventh scale row and 2 to 3 scales long. Additionally H. tanzeri has the following characters: tail length, 22.5 per cent of the total length; postocular stripe not continuous with nape blotch, and 7 supralabials; whereas, H. torquata has a tail length 19.5 per cent or less of the total length; a postocular stripe that may or may not join the nuchal blotch; usually (99 per cent of specimens examined) 8 or more supralabials. (Dixon & Lieb 1972) 
CommentDiet: mostly specialized on lizards

Behavior: nocturnal

Distribution: Not in Querétaro fide Tepos-Ramírez M et al. (2023), although the type locality was reported to be in Querétaro. 
EtymologyThis species was described in honor of Ernest C. Tanzer, a young herpetology student who began working on this genus in 1965, but died unexpectedly in 1971. 
  • Beolens, Bo; Michael Watkins, and Michael Grayson 2011. The Eponym Dictionary of Reptiles. Johns Hopkins University Press, Baltimore, USA - get paper here
  • Dixon, James R. & Lieb, Carl S. 1972. A new night snake from Mexico (Serpentes: Colubridae). Contributions in Science (222): 1-7 - 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.
  • Flores-Hernández, M. Á, L. Fernández-Badillo, and Á. I. Hernández-González. 2017. Hypsiglena tanzeri Dixon and Lieb, 1972. Mexico, Hidalgo. Mesoamerican Herpetology 4(4): 962–963 - get paper here
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Lemos-Espinal JA, Smith GR, Woolrich-Piña GA 2018. Amphibians and reptiles of the state of San Luis Potosí, Mexico, with comparisons with adjoining states. ZooKeys 753: 83-106 - get paper here
  • Lemos-Espinal, Julio A. and James R. Dixon 2013. Amphibians and Reptiles of San Luis Potosí. Eagle Mountain Publishing, xii + 300 pp.
  • Leyte-Manrique A, Mata-Silva V, Báez-Montes O, Fucsko LA, DeSantis DL, García-Padilla E, Rocha A, Johnson JD, Porras LW, Wilson LD. 2022. The herpetofauna of Guanajuato, Mexico: composition, distribution, and conservation status. Amphibian & Reptile Conservation 16(2) [General Section: 133–180 (e321) - 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
  • Morales-Capellán, Nallely, Leonardo-Fernández-Badillo, Adriana López-Mejía, Guillermo Sánchez-Martínez and Irene Goyenechea. 2016. Confirmation of the night snake Hypsiglena tanzeri in Hidalgo, Mexico, and a new record for Reserva de la Biósfera de la Barranca de Metztitlán. Mesoamerican Herpetology 3(4): 1097–1100 - get paper here
  • Mulcahy DG, Martínez-Gómez JE, Aguirre-León G, Cervantes-Pasqualli JA, Zug GR 2014. Rediscovery of an Endemic Vertebrate from the Remote Islas Revillagigedo in the Eastern Pacific Ocean: The Clarión Nightsnake Lost and Found. PLoS One 9 (5): e97682. doi:10.1371/journal.pone.0097682 - get paper here
  • Mulcahy, Daniel G. 2008. Phylogeography and species boundaries of the western North American Nightsnake (Hypsiglena torquata): Revisiting the subspecies concept. Molecular Phylogenetics and Evolution 46 (3): 1095-1115 - get paper here
  • Rautsaw, R M; Holding, M L; Strickland, J L; Gaytán, J J C; González, F C G; Gaytán, G C; Jiménez, J M B & Parkinson, C L 2018. Geographic Distribution: Hypsiglena tanzeri (Tanzer's Night Snake). Herpetological Review 49 (2): 287 - 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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