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Atractus aboiporu MELO-SAMPAIO, PASSOS, FOUQUET, COSTA-PRUDENTE & TORRES-CARVAJAL, 2019

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Subspecies 
Common Names 
SynonymAtractus aboiporu MELO-SAMPAIO, PASSOS, FOUQUET, COSTA-PRUDENTE & TORRES-CARVAJAL 2019 
DistributionBrazil (Amapa)

Type locality: Serra do Navio, Amapa, Brazil.  
Reproduction 
TypesHolotype. MPEG 25796: Adult female, coll. U. Galatti, D. Silvano, and B. Pimenta, 9 November 2000. Paratype. MPEG 25797: same data as holotype. MPEG 19783: coll. U. Galatti and J. A. R. Bernardi, 29 August 2000, Pedra Branca do Amapari, Amapa. (0° 51’ 34’’ N, 51°52’ 34’’W; 161 m asl). 
DiagnosisDiagnosis. Atractus aboiporu can be distinguished from all congeners by the unique combination of the following characters: (1) smooth dorsal scale rows 15/15/15; (2) postoculars two; (3) loreal moderately long; (4) temporal formula 1þ2; (5) supralabials seven, third and fourth contacting eye; (6) infralabials seven, first four contacting chinshields; (7) maxillary teeth seven; (8) gular scale rows three; (9) preventrals two; (10) ventrals 133–135 in females, unknown in males; (11) subcaudals 15–16 in females, unknown in males; (12) in preservative, dorsum cinnamon to verona brown with a series of sepia blotches mostly like rhomboidal parallelograms along the vertebral axis; (13) in preservative, venter beige with two rows of sepia dots or square spots, mostly concentrated on the midbody scales; (14) small body size in female (maximum 275mm SVL); (15) small tail in female (7.6–10.8% SVL).

Comparisons. Among congeners from the Guiana Shield (including highland species), A. aboiporu differs from A. badius, A. duidensis, A. flammigerus, A. latifrons, A. riveroi, A. steyemarki, A. trefauti, A. schach, and A. torquatus by having 15 dorsal scales rows (vs. 17 scales rows). Considering species with 15 dorsal scales rows, A. aboiporu differs from A. insipidus and A. tamessari by having 135 ventrals, 15 subcaudals (vs. >150 and 24, respectively in both species); from A. trilineatus by having a dorsal brown colour brown with conspicuous black vertebral blotches, belly cream with two longitudinal brown stripes, seven supralabials, and seven infralabials (vs. dorsum reddish brown with three conspicuous longitudinal black stripes, belly uniformly cream, eight supralabials, and eight infralabials in A. trilineatus). Atractus aboiporu shares 15/15/15 dorsal scale rows, dorsal ground colour cinnamon to verona brown with sepia blotches drap-bordered, seven supralabials and seven infralabials only with species distributed south of Amazon River, A. boimirim and A. tartarus. However, A. aboiporu differ from both species by having two parallel rows of sepia spots along the belly (vs. venter uniformly creamish white or scattered with brown dots concentrated on lateral portions of ventral scales, but never forming conspicuous stripes in A. boimirim and A. tartarus). 
Comment 
EtymologyThe specific epithet ‘aboiporu’ is a Tupi indigenous name herein used in apposition alluding to the peculiar feeding habits of the new species (abóî = earthworm; poru = eater), as well as other congeners.
 
References
  • Melo-Sampaio, Paulo Roberto; Paulo Passos, Antoine Fouquet, Ana Lucia Da Costa Prudente & Omar Torres-Carvajal 2019. Systematic review of Atractus schach (Serpentes: Dipsadidae) species complex from the Guiana Shield with description of three new species. Systematics and Biodiversity, 17:3, 207-229, DOI: 10.1080/14772000.2019.1611674 - get paper here
 
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