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Atractus nasutus PASSOS, FERNANDES & LYNCH, 2009

IUCN Red List - Atractus nasutus - Data Deficient, DD

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common Names 
SynonymAtractus nasutus PASSOS, FERNANDES & LYNCH 2009
Atractus nasutus — WALLACH et al. 2014: 77 
DistributionColombia (Andes)

Type locality: Colombia, Antioquia department, San Pedro municipality, Vereda La Lana, 06°26’52’’N, 75°36’26’’W, ca. 2600 m elevation.  
TypesHolotype: CSJ 561, male, 1954, Hermano Daniel. 
DiagnosisDiagnosis. Atractus nasutus is distinguished from all congeners by the following: 17/17/17 smooth dorsal scale rows; two postoculars; long loreal; 1+2 temporals; seven supralabials, third and fourth contacting orbit; seven infralabials, first four contacting chinshields; 12 maxillary teeth, lacking diastema; three or four gular scale rows; four preventrals; 130 ventrals in the single male; 23 subcaudals; reddish brown dorsum, except by a light occipital band; creamish brown venter; small body size (single male with 176 mm SVL); moderate tail size (13.1% SVL); slightly bilobed, semicapitate, and semicalyculate hemipenis (Table 1). Among all congeners, Atractus nasutus shares only with A. lasallei and A. lehmanni the following suite of characters: 17 dorsal scale rows; seven upper and lower labials, first four contacting chinshields; generally four preventrals; 23–28 subcaudals in males; small to moderate tail size; long, robust, and acuminate caudal spine; reddish brown dorsum, with a light occipital band or blotches; brown pigmentation on venter. Atractus nasutus differs from both by having a distinctly acuminate snout, 12 maxillary teeth, 130 ventrals, large and complete occipital band, and a semicalyculate hemipenis (vs. truncate snout and 7–9 maxillary teeth in both species; 154–167 ventrals in males of A. lasallei and 139–155 in males of A. lehmanni; no occipital band in A. lasallei and narrow and incomplete occipital band in A. lehmanni; bicalyculate hemipenis in both species). 
EtymologyNamed after the Latin adjective ‘‘nasutus’’ meaning prominent snout region (5large-nosed). This word is used here in allusion to the acuminate snout of the new species. 
  • Passos, Paulo, Juan C. Arredondo, Ronaldo Fernandes and John D. Lynch 2009. Three new Atractus (Serpentes: Dipsadidae) from the Andes of Colombia. Copeia 2009 (3): 425-436 - 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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