Atractus stygius PASSOS, AZEVEDO, NOGUEIRA, FERNANDES & SAWAYA, 2019
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Atractus stygius
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| Higher Taxa | Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | |
| Synonym | Atractus stygius PASSOS, AZEVEDO, NOGUEIRA, FERNANDES & SAWAYA 2019 Atractus albuquerquei — ZAHER et al. 2005:32 (in part) |
| Distribution | Brazil (Mato Grosso: Parecis Plateau and adjacent areas) Type locality: Bocaiúva (12°29’50’’S, 57°52’30’’W; ca. 312 m), Craveri River, municipality of Brasnorte, state of Mato Grosso, Brazil. |
| Reproduction | |
| Types | Holotype: MNRJ 26734 (formerly UFMT 8139), adult male, collected in 2009 by Universidade Federal de Mato Grosso team during the faunal rescue operation for the construction of a small hydroelectric plant; Paratypes: Nine specimens, all from the state of Mato Grosso, Brazil: UFMT 8137 (adult female), UFMT 8138 (adult male), UFMT 8140 (juvenile female), UFMT 8141 (juvenile male), UFMT 8142 (juvenile male) same data as the holotype; an adult female, UFMT 3949, collected by M. Carvalho on May 2004, specimen found in the stomach of a Pseudoboa coronata (UFMT 3726), from Continental Farm (11°30’06’’S, 55°12’18’’W; ca. 350 m), municipality of Claudia; an adult female, MNRJ 26735 (formerly UFMT 9024),collectedbyR.A ́vilaandR.Kawashita-Ribeiroon18 January 2011 at Vale de São Domingos (coordinates in paper; ca. 500 m), municipality of Jauru ́; a juvenile female, UFMT 9116, collected on 3 March 2011 by R. Kawashita-Ribeiro at Jurena River, Sa ̃o Nicolau Farm (098510S, 588140W; ca. 220 m); an adult female, MZUSP 20667, collected on 17 October 2012 by JGP Consultoria Ambiental team in the faunal rescue operation for the construction of a small hydroelectric plant at Segredo (coordinates in paper; ca. 500 m), Juruena River, municipality of Sapezal. |
| Diagnosis | Diagnosis: Atractus stygius 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, first four contacting chinshields; (7) maxillary teeth seven; (8) gular scale rows usually four; (9) preventrals usually four; (10) ventrals 178–192 in females, 170–176inmales;(11)subcaudals 20–23 in females, 25–28 in males; (12) color in preservative, dorsum dark brown to black except for a conspicuous pale brown to beige parietal band; (13) in preservative, ventral surface of body cream, heavily pigmented with black marks, to mostly black; (14) maximum body size moderate in females (470 mm SVL) and males (390 mm SVL); (15) tail size small in females (8.0–9.7% SVL) and in males (8.1–10.4% SVL); (16) hemipenis moderately bilobed, semicapitate, and semicalyculate. (Passos et al. 2019) Additional details (3405 characters) are available for collaborators and contributors. Please contact us for details. |
| Comment | Similar species: Atractus albuquerquei; Possible misidentification: MZUSP 11157, 11242, fide Passos et al. 2019. |
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