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Crotalus exiguus CAMPBELL & ARMSTRONG, 1979

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Higher TaxaViperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Guerreran Pygmy Rattlesnake 
SynonymCrotalus ravus exiguus CAMPBELL & ARMSTRONG 1979
Crotalus ravus exiguus — BRYSON 2007
Crotalus exiguus — BLAIR et al. 2018
Crotalus exiguus — OLIVEIRA-DALLAND et al. 2022
Crotalus exiguus — CISNEROS-BERNAL et al. 2022 
DistributionMexico (Guerrero: Sierra Madre del Sur)

Type locality: 1.6 km E Omilteme, Guerrero, elevation 2090 m.  
Reproductionovovivparous 
TypesHolotype: UTA R-4533, an adult male; paratypes: UTA, KU 
DiagnosisDiagnosis: A subspecies of S. ravus distinguished from the other races (Table 1) by having the parietal scales divided transversely, the dorsal scales in 23 rows at midbody, total prefoveals usually numbering six or more, a small rattle (PRW usually less than 10% of tail length in males, 13% in females), 3 to 6 tail bands in males, and 2 to 4 tail bands in females [from CAMPBELL & ARMSTRONG 1979]. 
CommentVenomous!

Distribution: see map in Blair et al. 2018: 352 (Fig. 1) 
EtymologyC. r. exiguus was named from the Latin exiguus, meaning small, in reference to the size of the rattle. 
References
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  • Blair C, Bryson RW Jr, Linkem CW, Lazcano D, Klicka J, McCormack JE. 2018. Cryptic diversity in the Mexican highlands: Thousands of UCE loci help illuminate phylogenetic relationships, species limits and divergence times of montane rattlesnakes (Viperidae: Crotalus). Molecular Ecology Resources 19: 349–365 [2019] - get paper here
  • Bryson Jr, Robert W.; Robert W. Murphy, Amy Lathrop and David Lazcano-Villareal 2011. Evolutionary drivers of phylogeographical diversity in the highlands of Mexico: a case study of the Crotalus triseriatus species group of montane rattlesnakes. Journal of Biogeography 38: 697–710 - get paper here
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  • BRYSON, ROBERT W.; JR., CHARLES W. LINKEM, MICHAEL E. DORCAS, AMY LATHROP, JASON M. JONES, JAVIER ALVARADO-DÍAZ, CHRISTOPH I. GRÜNWALD & ROBERT W. MURPHY 2014. Multilocus species delimitation in the Crotalus triseriatus species group (Serpentes: Viperidae: Crotalinae), with the description of two new species. Zootaxa 3826 (3): 475–496 - get paper here
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