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Atractus boimirim PASSOS, PRUDENTE & LYNCH, 2016

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Higher TaxaColubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)
Common Names 
SynonymAtractus boimirim PASSOS, PRUDENTE & LYNCH 2016
Atractus cf. insipidus — SILVA 1993: 52
Atractus insipidus — SILVA et al. 2005: 39
Atractus boimirim — NOGUEIRA et al. 2019 
DistributionBrazil (Rondônia)

Type locality: Jamari River (see Silva 1993 for more details about the type locality), Vila Cachoeira de Samuel (08°45’S, 63°27’W, ca. 100 m elevation), municipality of Porto Velho, state of Rondônia, Brazil (Passos et al. 2016: Fig. 5).  
TypesHolotype: MPEG 17908, Adult male, collected between 14 November 1988 and 29 March 1989 by N. Jorge da Silva Jr. and team in the faunal rescue operation for the construction of the Samuel Hydroelectric Power Plant. The holotype and ten additional paratypes were previously catalogued in the CEPB collection but, unfortunately, the association of each specimen with the old numbers was lost.
Paratypes. Sixteen specimens, all from Brazil: 10 (6 females and 4 males), with same data as the holotype (MPEG 17909–11, 17916–17, MPEG 17922, and MPEG 17967–70); female (MPEG 23965) collected on 25 March 2009 at surroundings of Jaci-Parana ́ River, tributary of Madeira River, during the faunal rescue for the implantation of the Jirau Hydroelectric Power Plant (098150S, 648380W, ca. 60 m asl), municipality of Porto Velho, Rondoˆnia; female (MPEG 25259) and male (MPEG 25260) collected by J. Frota between January and March 2010 and (MPEG 21233) collected by M. Hoogmoed on 5 February 2005 at Sapopema base camp (048400S, 568320W, ca. 145 m asl), Parque Nacional da Amazoˆnia, municipality of Itaituba, state of Amazonas; female (MNRJ 24864, formerly MPEG 22638), collected by T. Avila-Pires on 27 January 2008 at Capiranga base camp (028280S, 568090W, ca. 30 m asl), municipality of Juruti, state of Para ́. 
DiagnosisDiagnosis: Atractus boimirim can be distinguished from all congeners by the following combination of characters: (1) smooth dorsal scale rows 15/15/15; (2) postoculars two; (3) loreal moderately long; (4) temporal formula usually 1þ2; (5) supralabials seven, third and fourth contacting eye; (6) infralabials seven, usually first four contacting chinshields; (7) maxillary teeth seven; (8) gular scale rows three; (9) preventrals usually two; (10) ventrals 150–162 in females, 143–154 in males; (11) subcaudals 18– 23 in females, 23–28 in males; (12) in preservative, dorsum pale brown with a series of alternating black spots usually completely separated by a conspicuous black vertebral stripe sometimes interrupted on the posterior region of body; (13) venter uniformly creamish white or scattered with brown dots concentrated on lateral portions of ventral scales; (14) maximum body size moderate in females (390 mm SVL), small in males (270 mm SVL); (15) tail size small in females (8.3–9.9% SVL), moderately long (12.2–13.7% SVL) in males; (16) hemipenis moderately bilobed, noncapitate, and slightly calyculate. 
CommentHabitat: Amazonian rainforest 
EtymologyThe specific epithet ‘‘boimirim’’ is a Tupi indigenous name (the linguistic branch of most Brazilian Indians), here employed as a noun in apposition alluding to the small body size of the new species (bóî = snake; mirim = small). The spelling (‘m) with the prefix ‘m before the snake radical bóî is optional in some variants of the Tupi-Guarani vocabulary. 
  • 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
  • Nogueira, Cristiano C.; Antonio J.S. Argôlo, Vanesa Arzamendia, Josué A. Azevedo, Fausto E. Barbo, Renato S. Bérnils, Bruna E. Bolochio, Marcio Borges-Martins, Marcela Brasil-Godinho, Henrique Braz, Marcus A. Buononato, Diego F. Cisneros-Heredia, 2019. Atlas of Brazilian snakes: verified point-locality maps to mitigate the Wallacean shortfall in a megadiverse snake fauna. South American J. Herp. 14 (Special Issue 1):1-274 - get paper here
  • Passos, Paulo; Ana L.C. Prudente and John D. Lynch 2016. Redescription of Atractus punctiventris and Description of Two New Atractus (Serpentes: Dipsadidae) from Brazilian Amazonia. Herp. Monographs 30 (1): 1-20 - get paper here
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