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Atractus alytogrammus KÖHLER & KIECKBUSCH, 2014

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common Names 
SynonymAtractus alytogrammus KÖHLER & KIECKBUSCH 2014 
DistributionColombia (Guaviare)

Type locality: Serrania de la Lindosa (2.46782°, -72.73155°), south of the municipality of San José del Guaviare, department of Guaviare, Colombia.  
Reproduction 
TypesHolotype: SMF 88371, male, collected on January 9, 1957 by Federico Medem. 
CommentDiagnosis. A species of the genus Atractus that differs from all congeners by the following combination of characters: (1) 17 smooth dorsal scale rows; (2) preocular absent; (3) loreal present, approximately as long as high; (4) temporals 1+2; (5) seven supralabials; (6) seven infralabials; (7) five maxillary teeth; (8) four gular scale rows; (9) four pre-ventrals; (10) 187 ventrals in single male; (11) 29/31 subcaudals in single male; (12) dorsum of body with longitudinal stripes; (13) venter uniformly dark gray; (14) SVL of single male 297 mm; (15) small to moderate tail length in single male (11.8 % of SVL); (16) hemipenis morphology unknown.

Comparisons. Among all currently recognized congeners, Atractus alytogrammus shares a dark venter and is morphologically similar to A. steyermarki, A. nigriventris, and A. trivittatus. It differs from A. steyermarki by having a uniform dark gray venter (vs. venter pale with a midventral stripe in A. steyermarki), 187 ventrals (vs. 160–167 in males in A. steyermarki), and 29/31 subcaudals (vs. 37–44 in males in A. steyermarki). Atractus alytogrammus differs from A. nigriventris and A. trivitattus by having a dorsal body pattern of longitudinal lines (vs. dorsum brown with black blotches in A. nigriventris and A. trivitattus) and 187 ventral scales in single known male (vs. 175 in single known female of A. nigriventris, 176 in single known female of A. trivitattus). Atractus alytogrammus differs further from A. trivitattus by having seven supralabials (vs. eight in A. trivitattus). Among congeners from Colombian Amazonia and surrounding lowlands, A. alytogrammus shares only with A. univittatus (Jan 1862) the combination of having 17 dorsal scale rows, seven supralabials, and a pattern with longitudinal stripes or lines on dorsum. Atractus alytogrammus differs from A. univittatus by having 187 ventrals in the single male (vs. 151–160 ventrals in males of A. univittatus), seven infralabials (vs. six infralabials in A. univittatus), and a uniform dark venter with lighter speckles on the edges (vs. a yellowish white venter in A. univittatus). 
EtymologyThe name alytogrammus is a compound noun derived from alytos (Greek for “unbroken”) and gramme (Greek for “line”) referring to the continuous dorsolateral pale stripe in this species. 
References
  • KÖHLER, GUNTHER & MAX KIECKBUSCH 2014. Two new species of Atractus from Colombia (Reptilia, Squamata, Dipsadidae). Zootaxa 3872 (3): 291–300 - get paper here
 
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