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Atractus thalesdelemai PASSOS, FERNANDES & ZANELLA, 2005

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) 
Common Names 
SynonymAtractus thalesdelemai PASSOS, FERNANDES & ZANELLA 2005
Atractus thalesdelemai — PASSOS et al. 2007
Atractus kangueryensis CACCIALI, VILLALBA & YANOSKY 2007
Atractus thalesdelemai — WALLACH et al. 2014: 81 
DistributionS Brazil (Rio Grande do Sul)

Type locality: Fazenda da Brigadda Militar, Municipality of Passo Fundo, Rio Grande do Sul, Brazil (28°14’30”S, 52°21’27”W).

kangueryensis: Paraguay (Itapúa); Type locality: Kangüery, privately-owned reserve by Guyra Paraguay within the area delimited for the implantation of the San Rafael National Park, district of Alto Vera, Itapúa Department (26°30’42”S, 55°47’20”W). Map legend:
TDWG region - Region according to the TDWG standard, not a precise distribution map.

NOTE: TDWG regions are generated automatically from the text in the distribution field and not in every cases it works well. We are working on it.
TypesHolotype: MNRJ 10052
Holotype: MNHNP 11117, female; Collected on 23 March 2006 by Ramón Villalba [kangueryensis] 
CommentDescription: Atractus thalesdelemai can be distinguished from all congeners by the combination of a single postocular, long loreal, six supralabials, generally six infralabials, 17 dorsal scale rows, six or seven maxillary teeth, and a dorsal color pattern in preservative uniformly grayish-brown with a creamish-white temporal region.

Diagnosis: Atractus thalesdelemai is distinguished from all congeners by the combination of the following characters: (1) 17/17/17 smooth dorsal scale rows; (2) single postocular; (3) loreal moderate; (4) temporals 1+2; (5) six supralabials, third and fourth contacting orbit; (6) six infralabials, first three contacting chinshields; (7) generally six maxillary teeth; (8) three gular scale rows; (9) generally three preventrals; (10) 165–169 ventrals in females, 149–154 in males; (11) 22–26 subcaudals in females, 26–30 in males; (12) dorsum grayish brown, except for first two dorsal scale rows creamish white; (13) venter and tail immaculate creamish white; (14) body size moderate in females (maximum SVL 381 mm), small in males (maximum SVL 265 mm); (15) tail small in females (9.1–10.8% SVL), moderate (13.1–14.3% SVL) in males; (16) hemipenis moderately bilobed, semicapitate, and semicalyculate [from Passos et al. 2010].

Synonymy: Atractus kangueyrensis was synonymized with Atractus thalesdelemai by PASSOS et al. 2010.

Diagnosis (kangueryensis): Atractus kangueryensis differs from A.albuquerquei, A.canedi, A.paraguayensis, A.reticulatus, and A.taeniatus by a higher number of dorsal scale rows (17 instead of 15); from A.reticulatus, A.serranus, A. trihedrurus, and A.snethlageae by a greater number of ventral scales (130-166 instead of 165-169); and from A.albuquerquei by a lower number of ventral scales (170-200 instead of 165-169). Additionally, it can be distinguished from A.albuquerquei and A.canedi by a lower number of sub-caudal scales (27-50 instead of 22-25); from A.paraguayensis, A.serranus, A.taeniatus, A.trihedrurus andA.snethlageae by a lower number of supralabials (7-8 instead of 6); and from A.canedi, A.pantostictus, A.paraguayensis, A.serranus, A. snethlageae and A.zebrinus by a lower number of infralabials (7-8 instead of 6). Finally, the color pattern of the new species is distinct from that of Atractus kangueryensis from A.canedi, A.paraguayensis, A.reticulatus, A.serranus, A.taeniatus, A.thalesdelemai, A.snethlageae andA.zebrinus.

Habitat (kangueryensis): natural grassland with several patches of Atlantic forest surrounding it. 
EtymologyNamed after Thales de Lema, Brazilian herpetologist.

Etymology (kangueryensis): The specific epithet “kangueryensis” is a proper noun from the type-locality. It comes from the Guarani language and means “water coming from the bones” (Kangue: bone; ry: liquid, water), in reference to a place where the tribe MbyaGuarani buried their members. It is also the name of a stream that flows 2000 m far from the location where the holotype was collected. 
  • Cacciali, P.; Villalba, R. & Yanosky, A.A. 2007. A NEW SPECIES OF ATRACTUS (SERPENTES:COLUBRIDAE: DIPSADINAE) FROM THE ATLANTIC FOREST OF ALTO PARANÁ, PARAGUAY. South American J. Herp. 2 (2): 83-88 - get paper here
  • Cacciali, Pier; Norman J. Scott, Aida Luz Aquino Ortíz, Lee A. Fitzgerald, and Paul Smith 2016. The Reptiles of Paraguay: Literature, Distribution, and an Annotated Taxonomic Checklist SPECIAL PUBLICATION OF THE MUSEUM OF SOUTHWESTERN BIOLOGY, NUMBER 11: 1–373 - get paper here
  • Passos, P., R. Fernandes and Borges-Nojosa, D.M. 2007. A New Species of Atractus (Serpentes: Dipsadinae) from a Relictual Forest in Northeastern Brazil. Copeia 2007 (4): 788–797 - get paper here
  • Passos, P., R. Fernandes and N. Zanella 2005. A new species of Atractus (Serpentes: Colubridae) from Southern Brazil. Herpetologica 61 (2): 209-218 - get paper here
  • Passos, P.; Fernandes, R.; Bernils, R.S. & Moura-Leite, J.C. de 2010. Taxonomic revision of the Brazilian Atlantic Forest Atractus (Reptilia: Serpentes: Dipsadidae). Zootaxa 2364: 1–63 - get paper here
  • Wallach, Van; Kenneth L. Williams , Jeff Boundy 2014. Snakes of the World: A Catalogue of Living and Extinct Species. Taylor and Francis, CRC Press, 1237 pp.
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