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Atractus obtusirostris WERNER, 1916

IUCN Red List - Atractus obtusirostris - Data Deficient, DD

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common NamesE: Bignose Ground Snake 
SynonymAtractus obtusirostris WERNER 1916: 308
Atractus obtusirostris — PETERS & OREJAS-MIRANDA 1970: 32
Atractus obtusirostris — PASSOS & LYNCH 2010
Atractus obtusirostris — WALLACH et al. 2014: 77 
DistributionColombia (Tolima; Pensilvania)

Type locality: Cañon del Tolima, Dep. de Tolima, Colombia
Lectotype locality: Canñon del Tolima (5 Combeima River; west Ibague, 04° 26’ N, 75° 14’ W, ca. 1100 m elevation), department of Tolima, Colombia.  
TypesHolotype: MCZ 22347 (fide Köhler & Kieckbusch 2014); Syntype: ZMH (formerly no. 33, 181), male, subadult. Formerly 3 syntypes. The single syntype of (ZMH 4428 (now lectotype), is one of the smaller ones of the type series.
Lectotype: Adult male, ZMH 4428 (designated by PASSOS & LYNCH 2010). 
DiagnosisDiagnosis: Atractus obtusirostris is distinguished from all congeners by having: (1) 17/ 17/17 smooth dorsal scale rows; (2) two postoculars; (3) moderate loreal; (4) temporals 1 + 2; (5) seven supralabials, third and fourth contacting orbit; (6) seven infralabials, first three contacting chinshields; (7) 9–11 maxillary teeth; (8) three or four gular scale rows; (9) three or four preventrals; (10) 160–164 ventrals in females, 145–151 in males; (11) 27–32 subcaudals in females, 30–37 in males; (12) dorsal ground color pale brown with conspicuous vertebral line generally connected to paravertebral blotches and first two scale rows contrasting to remaining series; (13) venter predominantly cream with little invasion of brown pigment between suture of the ventral scales; (14) small to moderate body size, females reaching 376 mm SVL, males 240 mm SVL; (15) moderate tail in females (11.3–13.7% SVL) and long (14.6–18.1% SVL) in males; (16) hemipenis moderately bilobed, semicapitate, semicalyculate. 
CommentSee also A. melanogaster.

Specimens: Werner described this species based on 3 specimens. Later specimens have been confused with A. melanogaster or A. crassicaudatus. 
  • Passos, Paulo and John D. Lynch 2010. Revision of Atractus (Serpentes: Dipsadidae) from Middle and Upper Magdalena Drainage of Colombia. Herpetological Monographs 24 (1): 149-173 - get paper here
  • Pérez-Santos,C. & Moreno, A.G. 1988. Ofidios de Colombia. Museo reegionale di Scienze Naturali, Torino, Monographie VI, 517 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.
  • Werner,F. 1916. Bemerkungen über einige niedere Wirbeltiere der Anden von Kolumbien mit Beschreibungen neuer Arten. Zool. Anz. 47: 301-311 - get paper here
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