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Hypsiglena jani DUGÈS, 1865

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
SubspeciesHypsiglena jani dunklei (TAYLOR 1939)
Hypsiglena jani jani (DUGÈS 1866)
Hypsiglena jani texana (STEJNEGER 1893) 
Common Namesdunklei: Tamaulipas Nightsnake
jani: San Luis Potosi Nightsnake
texana: Texas Nightsnake 
SynonymHypsiglena torquata jani (DUGÈS 1865)
Liophis janii DUGÈS 1865: 32
Hypsiglena ochrorhynchus janii — TANNER 1946: 48 (1944)
Hypsiglena torguata — VAN DEVENDER & LOWE 1977 (in error)
Hypsiglena torquata — CONANT & COLLINS 1991: 217
Hypsiglena torquata jani — CROTHER 2000: 63
Hypsiglena torquata jani — TENNANT & BARTLETT 2000: 457
Hypsiglena torquata jani — SCHMIDT & KUNZ 2005: 22
Hypsiglena jani jani — MULCAHY 2008
Hypsiglena jani — WALLACH et al. 2014: 343

Hypsiglena jani dunklei (TAYLOR 1939)
Hypsiglena dunklei TAYLOR 1939
Hypsiglena dunklei — TANNER 1946: 48 (1944)
Hypsiglena jani dunklei — MULCAHY 2008

Hypsiglena jani texana (STEJNEGER 1893)
Hypsiglena texana STEJNEGER 1893: 205
Hypsiglena ochrorhynchus texana — TANNER 1946: 51 (1944)
Hypsiglena torquata texana — TANNER 1985: 632
Hypsiglena torquata jani — DIXON 2000: map 118
Hypsiglena jani texana — MULCAHY 2008
Hypsiglena jani texana — CROTHER et al. 2012 
DistributionMexico (Guanajuato, N Querétaro, N Hidalgo, San Luis Potosi, SW Tamaulipas)

dunklei: Mexico (Tamaulipas, Nuevo Leon); Type locality: Hacienda La Clementina, 3 mi. W. of Forlon, Tamaulipas,
Mexico, 23.26°, -98.85° (NAD27).

jani: USA (Texas, New Mexico, Oklahoma); Type locality: Guanajuato, Guanajuato, Mexico.

texana: USA (E Arizona, New Mexico, SE Colorado, SW Kansas, W Oklahoma, Texas), Mexcio (Tamaulipas, Nuevo Leon, Coahuila, E Chihuahua, E Durango, Zacatecas, San Luis Potosi, Aguascalientes); Type locality: “beween Laredo and Camargo, Texas”. Map legend:
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
 
Reproductionoviparous 
TypesHolotype: MADUG / HE 102 (Museo de Historia Natural Alfredo Dugès, at the University of Guanajuato); Neotype: USNM 9889 (designated by Smith & Necker 1943, incorrect fide Flores-Villela 2016); Synypes: USNM 9889, 11369 (unclear fide TANNER 1944: 37, but confirmed by Dan Mulcahy, pers. comm. 11 March 2011)
Holotype: MCZ R-42594 [dunklei]
Holotype: USNM 1782 [texana] 
Comment 
EtymologyThe name jani is a patronym for the 19th century herpetologist Giorgio Jan, who along with his co-author, Ferdinand Sordelli, authored lconographie Generale des Ophidiens, a classical work in herpetology that was published in three volumes from 1860 to 1881. 
References
  • Axtell, Ralph W. 1939. AMPHIBIANS AND REPTILES OF THE BLACK GAP WILDLIFE MANAGEMENT AREA, BREWSTER COUNTY, TEXAS. Southwestern Naturalist 4 (2): 88-109
  • Conant,R. & Collins,J.T. 1991. A Field Guide to Reptiles and Amphibians of Eastern/Central North America, 3rd ed. Houghton Mifflin (Boston/New York), xx + 450 p.
  • Crother, B. I. 2000. Scientific and standard English names of amphibians and reptiles of North America north of Mexico, with comments regarding confidence in our understanding. Herpetological Circular 29: 1-82
  • Crother, B. I. (ed.) 2012. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles, and Crocodilians, Seventh Edition. Herpetological Circular 39: 1-92
  • Davis, D. R. and T. J. LaDuc 2017. Hypsiglena jani (Chihuahuan Nightsnake) Diet and prey size. Herpetological Review 48 (2): 450-451
  • Dixon, James R. 2000. Amphibians and reptiles of Texas, second edition. Texas A&M University Press, 421 pp.
  • Dixon, James R. and Julio A. Lemos-Espinal 2010. Amphibians and reptiles of the state of Queretaro, Mexico. Tlalnepantla UNAM, 428 pp.
  • Doody, J. S., K. Elmore, A. Meier and P. Kain 2016. Hypsiglena jani (Texas Nightsnake) reproduction / timing of mating. Herpetological Review 47(3): 479.
  • Dugès, A., 1865. Du Liophis janii. Mém. Ac. Montpellier 6: 32–33.
  • FLORES-VILLELA, OSCAR; CÉSAR A. RÍOS-MUÑOZ, GLORIA E. MAGAÑA-COTA & NÉSTOR L. QUEZADAS-TAPIA 2016. Alfredo Dugès’ type specimens of amphibians and reptiles revisited Zootaxa 4092 (1): 033–054
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Karges, J.P. 1979. Texas amphibian and reptiles: some new distributional records, part II. Herpetological Review 10 (4): 118-119 - 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.
  • 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
  • Mata-Silva, Vicente, Jerry D. Johnson and Larry David Wilson. 2014. Hypsiglena jani (Chihuahuan nightsnake) diet. Herpetological Review 45 (2): 338
  • 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
  • Myers, Edward A. and Mariano Soley-Guardia. 2015. Hypsiglena jani (Texas nightsnake) diet. Herpetological Review 46 (2): 274
  • Roelke, Corey E., Elijah Wostl, Rachel Wostl, Mallory L. Fontenot and Wyatt T. Roelke. 2014. Geographic Distribution: Hypsiglena jani (Chihuahuan nightsnake). Herpetological Review 45 (3): 465
  • Schmidt, D. & Kunz, K. 2005. Ernährung von Schlangen. Natur und Tier Verlag, Münster, 159 pp. - get paper here
  • Stejneger,L.H. 1893. Annotated list of the reptiles and batrachians collected by the Death Valley Expedition in 1891, with descriptions of new species. North American Fauna, No. 7: 159-228 (+ 14 plates + 4 maps) - get paper here
  • Tanner, W. W. 1946. A taxonomic study of the genus Hypsiglena. Great Basin Naturalist 5 (3-4): 25-92 [1944] - get paper here
  • Tanner, Wilmer W. 1985. Snakes of Western Chihuahua. Great Basin Naturalist 45 (4): 615-676 - get paper here
  • Taylor, Edward H. 1939. On Mexican snakes of the genera Trimorphodon and Hypsiglena. Univ. Kansas Sci. Bull. 25 (16): 357-383 [1938] - get paper here
  • Taylor, Nathan Caleb and Sean P. Graham. 2015. Geographic Distribution: Hypsiglena jani (Chihuahuan nightsnake). Herpetological Review 46 (4): 573
  • Tennant, A. 2003. Snakes of North America - Eastern and Central Regions, revised edition. Lone Star Books, 605 pp.
  • Tennant, A. & Bartlett, R.D. 2000. Snakes of North America - Eastern and Central Regions. Gulf Publishing, Houston, TX, 588 pp.
  • Terán-Juárez, Sergio A., Elí García Padilla, Vicente Mata-Silva, Jerry D. Johnson and Larry David Wilson. 2016. The herpetofauna of Tamaulipas, Mexico: composition, distribution, and conservation status. Mesoamerican Herpetology 3 (1): 43–113 - get paper here
  • Valdez-Lares, R.; R. Muñiz-Martínez; E.Gadsden; G. Aguirre-León; G. Castañeda-Gaytán; R. Gonzalez-Trápaga 2013. Checklist of amphibians and reptiles of the state of Durango, México. Check List 9 (4):714-724 - get paper here
  • Van Devender, Thomas R.;Lowe, Charles H. Lowe, Jr. 1977. Amphibians and reptiles of Yepomera, Chihuahua, Mexico. Journal of Herpetology 11 (1): 41-50 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. Taylor and Francis, CRC Press, 1237 pp.
  • Werler, John E. & James R. Dixon 2000. Texas Snakes. University of Texas Press, 544 pages
 
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