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Rena segrega (KLAUBER, 1939)

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Higher TaxaLeptotyphlopidae, Epictinae, Epictini, Typhlopoidea, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Trans-Pecos Blind Snake/Threadsnake
G: Trans-Pecos Schlankblindschlange
S: Culebra Lombriz de Trans- Pecos 
SynonymLeptotyphlops humilis segregus KLAUBER 1939
Leptotyphlops humilis segregus — JAMESON & FLURY 1949
Leptotyphlops humilis segregus — MILSTEAD 1953
Leptotyphlops humilis chihuahuaensis TANNER 1985: 623
Leptotyphlops humilis segregus — CONANT & COLLINS 1991: 145
Leptotyphlops humilis segregus — CROTHER 2000: 65
Leptotyphlops humilis segregus — TENNANT & BARTLETT 2000: 34
Rena humilis segregus — CROTHER et al. 2012
Rena segrega — WALLACH et al. 2014: 631
Rena humilis segrega — CROTHER et al. 2017
Rena segrega — VILLELA-FLORES et al. 2022 
DistributionUSA (SE Arizona, Texas [Trans-Pecos], New Mexico), Mexico (San Luis Potosí, N Coahuila, Nuevo León, Durango, Chihuahua)

Type locality: Chalk Draw, Brewster County, Texas  
Reproductionoviparous (not imputed, fide Zimin et al. 2022) 
TypesHolotype: USNM 103670 
DiagnosisRena humilis segrega is characterized by having 10 rows of scales around the tail, as in other members of the R. dulcis group, but it lacks supraocular scales, similar to members of the R. humilis group.

Diagnosis: Differs from other races in having a combination of 10 scale rows around the tail, less than 250 dorsals (210 and 244 in 2 known specimens), and 14 subcaudals. (Hahn 1979) 
CommentSynonymy: chihuahuaensis has been considered as a synonym of humilis, but synonymized with segrega by Lemos-Espinal and Smith (2007) and Flores-Villela et al. 2022. 
EtymologyThe specific name is a Latin word segrego meaning "separate," and was applied to the population in western Texas, which was isolated from other populations of Rena humilis, as then understood (LEMOS-ESPINAL & DIXON 2013). 
References
  • 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. (ed.) 2012. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles, and Crocodilians, Seventh Edition. Herpetological Circular 39: 1-92
  • Hahn D E 1979. Leptotyphlops humilis (Baird and Girard). Western blind snake. Catalogue of American Amphibians and Reptiles (232): 1-4 - get paper here
  • Heimes, P. 2016. Snakes of Mexico. Chimaira, Frankfurt, 572 pp
  • Jameson, David H.;Flury, Alvin G. 1949. The reptiles and amphibians of the Sierra Vieja Range of southwestern Texas. Texas Journal of Science 1 (2): 54-77 - get paper here
  • Klauber, Laurence M. 1939. A new subspecies of the western worm snake. Transactions of the San Diego Society of Natural History 9 (14): 67-68 - get paper here
  • Lazcano D, Nevárez-de los Reyes M, García-Padilla E, Johnson JD, Mata-Silva V, DeSantis DL, Wilson LD. 2019. The herpetofauna of Coahuila, Mexico: composition, distribution, and conservation status. Amphibian & Reptile Conservation 13(2) [General Section]: 31–94 (e189) - get paper here
  • Lemos-Espinal JA, Smith GR, Gadsden-Esparza H, Valdez-Lares R, Woolrich-Piña GA 2018. Amphibians and reptiles of the state of Durango, Mexico, with comparisons with adjoining states. ZooKeys 748: 65-87 - get paper here
  • 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. (ed.) 2015. Amphibians and Reptiles of the US - Mexico Border States / Anfibios y Reptiles de los Estados de la Frontera México - Estados Unidos. Texas A&M University Press, College Station, Texas. x + 614 pp.; ISBN 978-1-62349-306-6. - 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.
  • Milstead, William W. 1953. Ecological distribution of the lizards of the La Mota Mountain Region of Trans-Pecos Texas. Texas Journal of Science 5 (4): 403-415 - get paper here
  • Nevárez-de-los-Reyes, Manuel, David Lazcano, Elí García-Padilla, Vicente Mata-Silva, Jerry D. Johnson and Larry David Wilson. 2016. The Herpetofauna of Nuevo León, Mexico: Composition, Distribution, and Conservation. Mesoamerican Herpetology 3 (3): 558–638 - get paper here
  • Tennant, A. & Bartlett, R.D. 2000. Snakes of North America - Eastern and Central Regions. Gulf Publishing, Houston, TX, 588 pp.
  • 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.
  • Zimin, A., Zimin, S. V., Shine, R., Avila, L., Bauer, A., Böhm, M., Brown, R., Barki, G., de Oliveira Caetano, G. H., Castro Herrera, F., Chapple, D. G., Chirio, L., Colli, G. R., Doan, T. M., Glaw, F., Grismer, L. L., Itescu, Y., Kraus, F., LeBreton 2022. A global analysis of viviparity in squamates highlights its prevalence in cold climates. Global Ecology and Biogeography, 00, 1–16 - get paper here
 
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