Atractus steyermarki ROZE, 1958
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Atractus steyermarki
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| Higher Taxa | Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | |
| Synonym | Atractus steyermarki ROZE 1958: 301 Atractus steyermarki — LANCINI & KORNACKER 1989 Atractus steyermarki — GORZULA & SEÑARIS 1999 Atractus steymarki [sic] — PASSOS et al. 2007 Atractus guerreroi MYERS & DONNELLY 2008 Atractus steyermarki — PASSOS et al. 2013 Atractus guerreroi — WALLACH et al. 2014: 73 Atractus steyermarki — WALLACH et al. 2014: 81 Atractus guerreroi — NATERA-MUMAW et al. 2015: 119 |
| Distribution | Venezuela (Bolivar), through Guyana (Cuyuni-Mazaruni District) Type locality: Chimantá Tepui, Estado de Bolivar, Venezuela, (05°18’N, 62°10’W; ca. 1430 m elevation) guerreroi: Venezuela (Auyantepui); Type locality: Auyantepui (ca. 2100 m elevation) |
| Reproduction | oviparous |
| Types | Holotype: FMNH 69920, adult male; Paratype: FMNH 74036, adult female |
| Diagnosis | Diagnosis: Atractus steyermarki can be distinguished from all congeners by the following combination of characters: (1) smooth dorsal scale rows 17/17/17; (2) post-oculars usually two; (3) loreal moderately long; (4) temporals 1 + 2; (5) supralabials six or seven, third and fourth contacting orbit; (6) infralabials seven, first three contacting chin shields; (7) maxillary teeth five or six; (8) gular scale rows four; (9) preventrals four or five; (10) ventrals 177–183 in females, 160–167 in males; (11) subcaudals 27–33 in females, 37–44 in males; (12) in preservation, dorsum dark brown to black, usually with a dark vertebral stripe and sometimes with barely defined dark brown dorsolateral stripes; (13) in preservation, venter of juveniles predominantly cream generally with a midventral stripe at least in the posterior region of the body, venter of adults similar, but with broader and more conspicuous midventral stripe; (14) body size moderate, females reaching 373 mm SVL, males 348 mm SVL; (15) tail size moderate in females (11.1–13.4% SVL) and relatively long (16.1–20.1% SVL) in males; (16) hemipenis unilobed with bifurcate sulcus spermaticus, organ noncapitate and noncalyculate [PASSOS et al. 2013]. |
| Comment | Synonymy: after PASSOS et al. 2013: 64. Habitat: open formations like savannahs and tepui meadows as well as cloud forests between 500 and 2244 m elevation. |
| Etymology | Named after Dr. Julian Alfred Steyermark (1909-1988), a botanist, explorer, taxonomist, plant collector, and Curator of the Missouri Botanical Gardens. |
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