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Tachymenis trigonatus (LEYBOLD, 1873)

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: False Tomodon Snake 
SynonymPelias trigonatus LEYBOLD 1873
Tomodon ocellatus BOULENGER 1896 (part.)
Pseudotomodon mendozinus KOSLOWSKY 1896: 455
Pseudotomodon crivellii PERACCA 1897
Tomodon ocellatus trigonatus — AMARAL 1929
Pseudotomodon trigonatus — SERIÉ 1936
Tomodon ocellatus trigonatus — ABALOS, BAEZ & NADER 1964
Pseudotomodon trigonatus — BAILEY 1970
Pseudotomodon trigonatus — PETERS & OREJAS-MIRANDA 1970
Pseudotomodon trigonatus — CEI 1993
Pseudotomodon trigonatus — GIRAUDO & SCROCCHI 2002
Pseudotomodon trigonatus — WALLACH et al. 2014: 608
Tachymenis trigonata — TREVINE et al. 2022 
DistributionW Argentina (Chubut, Rio Negro, Neuquén, La Pampa, Menodza, San Luis, San Juan, La Rioja, Córdoba, Santiago del Estero, Catamarca)

Type locality: Estancia Los Aguirre, Departamento San Carlos, Mendoza, Argentina.  
Reproductionovovivparous 
TypesHolotype: MNHNC?, a 400 mm specimen (F. Leybold, Feb. 1871).
Type: MSNTO R1663 [crivelli] 
Diagnosis 
CommentSynonymy after CEI 1993.

Type species: Pelias trigonatus LEYBOLD 1873 is the type species of the genus Pseudotomodon KOSLOWSKY 1896, now a synonym of Tachymenis. 
EtymologyNamed after Latin trigonum, triangle; three sided figure and Latin -atus, provided with. [“...maculisque obscurioribus, trigonis, tota via jam oppositi romboideis, jam alternantibus trigonis, decurrentibus...”]. (from Esteban Lavilla, pers. comm., May 2024) 
References
  • Abalos, J.W., Baez, E.C., & Nader, R. 1964. Serpientes de Santiago del Estero. Acta Zoologica Lilloana 20: 211-283
  • Amaral, A. do 1930. Estudos sobre ophidios neotropicos XVII. Valor systematico de varias formas de ophidios neotropicos. Mem. Inst. Butantan 4: 1-68 [1929] - get paper here
  • Avila, Luciano Javier 1997. Geographic Distribution. Pseudotomodon trigonatus. Herpetological Review 28 (2): 98 - get paper here
  • Cei, J. M. 1993. Reptiles del noroeste, nordeste y este de la Argentina. Museo Regionale Sci. Naturale Torino, Monografie 14: 1-949
  • Cruz,F.B., Schulte, J.B. & Bellagamba,P. 1999. New distributional records and natural history notes for reptiles from Southern Argentina. Herpetological Review 30 (3): 182 - get paper here
  • Giraudo, A. R., and G. J. Scrocchi 2002. Argentinian Snakes: An Annotated Checklist. Smithsonian Herp. Inf. Serv. (132): 1-53 - get paper here
  • Harvey, M.B. & Muñoz S., A. 2004. A new species of Tomodon (Serpentes: Colubridae) from high elevations in the Bolivian Andes. Herpetologica 60 (3): 364-372 - get paper here
  • Koslowsky,J. 1896. Sobre algunos reptiles de Patagonia y otras regiones argentinas. Revista Mus. La Plata 7: 447-457 - get paper here
  • Leybold, F. 1873. Excursión a las Pampas argentinas, Hojas de mi diario. Santiago, 108 pp. - get paper here
  • Minoli I, Morando M, Avila LJ 2015. Reptiles of Chubut province, Argentina: richness, diversity, conservation status and geographic distribution maps. ZooKeys 498: 103-126. doi: 10.3897/zookeys.498.7476 - get paper here
  • Pelegrin, N., Lara-Resendiz, R. A., Leao S. M. and Sanchez, J. M. 2020. Pseudotomodon trigonatus (false tomodon snake). Habitat. Herpetological Review 51: 154-155. - get paper here
  • Peracca, M.G. 1897. Sopra un nuovo genere di colubride opistoglifo della Repubblica Argentina. Bollettino dei Musei di Zoologia ed Anatomia comparata della R. Universita di Torino, 12 (278): 1-2 - get paper here
  • Rolón MCJ, Vera DG, De Los Santos FL, Harkes M, Tettamanti G, Calvo R, Di Pietro DO, Velasco MA, Avila LJ, Williams JD, Kacoliris FP 2024. Herpetofauna of Laguna Blanca National Park, Argentinean Patagonia: species list and conservation status. Neotropical Biology and Conservation 19(1): 35-50 - get paper here
  • Scrocchi, G.J. 1997. Acerca de la localidad tipo de Bothrops ammodytoides Leybold (Serpentes, viperidae) y Pseudotomodon trigonatus (Leybold) (Serpentes: Colubridae). Cuadernos de Herpetologia 11 (1-2):69-70 - get paper here
  • Scrocchi, G.J.; Moreta, J.C. & Kretzschmar, S. 2006. Serpientes del Noroeste Argento [Jujuy, Salta, Tucumán, Catamarca, La Rioja, Santiago del Estero]. Fundación Miguel Lillo, Tucumán, 178 pp.
  • Scrocchi, Gustavo J.; Cristian S. Abdala,Javier Nori, Hussam Zaher 2010. Reptiles de la provincia de Río Negro, Argentina. Fondo Ed. Rionegrino, 249 pp.
  • Trevine, V. C., Grazziotin, F. G., Giraudo, A., Sallesbery‐Pinchera, N., Vianna, J. A., & Zaher, H. 2022. The systematics of Tachymenini (Serpentes, Dipsadidae): An updated classification based on molecular and morphological evidence. Zoologica Scripta - 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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