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Crotalus brunneus HARRIS & SIMMONS, 1978

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Higher TaxaViperidae, Crotalinae, Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Subspecies 
Common NamesE: Oaxacan Pygmy Rattlesnake 
SynonymSistrurus ravus brunneus HARRIS & SIMMONS 1978
Crotalus ravus brunneus — BRYSON 2007
Crotalus brunneus — BLAIR et al. 2018
Crotalus brunneus — GARCIA-PADILLA et al. 2020
Crotalus brunneus — CISNEROS-BERNAL et al. 2022 
DistributionMexico (Oaxaca: Mesa del Sur)

Type locality: 2.7 km E Ixtlan de Juárez, Oaxaca.  
Reproductionovovivparous 
TypesHolotype: AMNH 102916, adult male; paratypes: AMNH 65174-5, 89636-7, 93226-7, 100841-2, 102915, 104404, USNM
46555 and 46609 
DiagnosisDiagnosis: A subspecies of S. ravus (Fig. 8) distinguished from the other races (Table 1) by having the parietals usually undivided, dorsal scales usually in 23 rows at midbody, total prefoveals usually exceeding 3 but not more than 6, a small rattle (PRW usually less than 109 of tail length in males, 13% in females), 5-8 tail bands in males, and 4-6 in females. The brief description of the holotype by Harris and Simmons (1978) contains two errors. There are 144 ventrals (not 148) and the total length is approximately 660 mm (not 640 mm) [from CAMPBELL & ARMSTRONG 1979].


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CommentVenomous!

Distribution: see map in Blair et al. 2018: 352 (Fig. 1) 
EtymologyNamed after Latin Brunneus = deep brown. 
References
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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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