Atractus punctiventris AMARAL, 1933
Can you confirm these amateur observations of Atractus punctiventris?
|Higher Taxa||Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)|
|Common Names||Pointed Ground Snake|
|Synonym||Atractus punctiventris AMARAL 1933: 117|
Atractus punctiventris — PASSOS et al. 2007
Atractus punctiventris — WALLACH et al. 2014: 79
Type locality: Villavicencia, Intendencia de Meta, Colombia [= Vilavicencio, Departamento del Meta], (04°09’N, 73°38’W, ca. 500 m elevation Map legend:
- Type locality.
- 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.
|Types||Holotype: MLS 254, formerly MLS 102|
|Comment||Th species is known from less than 10 specimens (Passos et al. 2016).|
Diagnosis. Atractus punctiventris can be distinguished from all congeners by the following combination of characters: (1) smooth dorsal scale rows generally 15/15/15; (2) postoculars two; (3) loreal moderately long; (4) temporal formula 1þ2; (5) supralabials usually seven, third and fourth contacting eye; (6) infralabials usually seven, first three contacting chinshields; (7) maxillary teeth five to six; (8) gular scale rows three; (9) preventrals one or two; (10) ventrals 170–183 in females, 155–167 in males; (11) subcaudals 27– 34 in females, 32–36 in males; (12) in preservative, dorsum pale brown to brown with a series of brown to black irregular light bordered blotches; (13) in preservative, venter creamish white with brown dots or spots generally arranged in the center of ventral scales usually forming a conspicuous midline along belly; (14) maximum body size moderate in females (415 mm SVL) and males (345 mm SVL); (15) moderately long tail in females (12.5–14.0% SVL) and in males (14.4–15.6% SVL); (16) hemipenis slightly bilobed, semicapitate, and semicalyculate (Passos et al. 2016: 4).
Comparisons. Among congeners from cis-Andean provinces of Morrone (2014), Atractus punctiventris shares only with Atractus major Boulenger 1894 and Atractus schach (Boie 1827) a pale brown dorsum with dark brown light-bordered blotches, seven upper and lower labials, five to six maxillary teeth, and a creamish white venter frequently covered with a median longitudinal line caused by the linear arrangement of centered, round, dark brown spots. Atractus punctiventris differs from both by having 15 dorsal scale rows and slightly bilobed hemipenis (vs. 17 and moderately bilobed hemipenis). Furthermore, A. punctiventris differs from A. major by having the hemipenial body twice as long as the capitulum with capitular groove evident on the asulcate side of the organ (vs. hemipenial body equivalent in size to capitulum with capitular groove indistinct on both sides of the organ); from A. schach by having the first three infralabials contacting chinshields (vs. four). Atractus punc- tiventris occurs in sympatry at least with Atractus elaps (Gu ̈nther 1858) and Atractus univittatus (Jan 1862), but differs from A. univittatus by having 15 dorsal scale rows at midbody and hemipenial body twice as long as capitulum (vs. 17 dorsal scale rows and hemipenial body equivalent in size to capitulum) and from A. elaps by having a pale brown dorsum with black blotches light-bordered (vs. red dorsum with complete black rings forming dyads or tetrads separated by white rings) (Passos et al. 2016: 4).
Distribution: Known from the municipalities of Villavicencio (04°09’N, 73°38’W), Meta; San Luís de Gaceno (04°49’N, 73°10’W) Boyaca ́; and Nunchía (05°38’N, 72°12’W), Casanare.
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