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Atractus imperfectus MYERS, 2003

IUCN Red List - Atractus imperfectus - Data Deficient, DD

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common Names 
SynonymAtractus imperfectus MYERS 2003
Atractus crassicaudatus — SMITH 1958: 223 (fide MYERS 2003)
Atractus imperfectus — WALLACH et al. 2014: 74 

Type locality: Piedras-Pacora Ridge, central Panama.  
TypesHolotype: MCZ 50213 
DiagnosisDIAGNOSIS: Although known only from a partial specimen, this species is distinguished from other Panamanian Atractus as follows: Resembles clarki in having pale bars on black neck but differs in larger size, relatively smaller eye, extensive black pigmentation on anterior ventrals, and in having only the hint of a pale collar. Resembles depressiocellus in having anterior black ventral pigmentation but differs in much smaller size, larger eye, low (vs. tall) supralabials below eye, and narrow pale bars on a black neck. Resembles darienensis in white supralabials and a similarly positioned vague nuchal collar, but differs in having pale bars on a black neck, a relatively larger eye, and a shorter but broader snout, with the rostral plate more extensive dorsally. Resembles hostilitractus in having pale bars or broken ‘‘rings’’ on a black neck, but differs in having a longer, less rounded snout, loreal not approaching internasal, white labials, and less extensive black pigmentation on underside of head and throat.
See Remarks in MYERS (2003) for further discussion of differences from Atractus darienensis, which seems to be the species most similar to A. imperfectus, at least based on accessible characters. Dunn and Bailey (1939) likened this specimen to the Andean A. crassicaudatus, but it is easily differentiated from that species and I see no reason to suspect a close relationship (from MYERS 2003). 
EtymologyNamed after the condition of the holotype from which all body parts posterior to the neck were missing. 
  • Dunn, Emmett R. & Bailey, Joseph R. 1939. Snakes from the uplands of the Canal Zone and of Darien. Bull. Mus. Comp. Zool. Harvard 86 (1): 1-22 - get paper here
  • Myers, C.W. 2003. Rare Snakes—Five New Species from Eastern Panama: Reviews of Northern Atractus and Southern Geophis (Colubridae: Dipsadinae). American Museum Novitates 3391: 1-47 - get paper here
  • Ray, Julie M. and Patty Ruback 2015. Updated checklists of snakes for the provinces of Panamá and Panamá Oeste, Republic of Panama. Mesoamerican Herpetology 2 (2): 168-188 - 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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