Atractus carrioni PARKER, 1930
Can you confirm these amateur observations of Atractus carrioni?
|Higher Taxa||Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)|
|Common Names||E: Parker's Ground Snake|
|Synonym||Atractus carrioni PARKER 1930: 208|
Atractus carrioni — PETERS 1960
Atractus carrioni — PASSOS & ARREDONDO 2009
Atractus carrioni — WALLACH et al. 2014: 70
Type locality: Loja, Ecuador, 2200 m elevation.
|Types||Holotype: BMNH 1922.214.171.124, female|
|Diagnosis||DIAGNOSIS: An Atractus unique within the genus in having no loreal shield. Readily distinguished by the following combination of characteristics: (1) 15 scale rows; (2) no loreal, although a small preocular sometimes present; (3) maxillary teeth eight or nine; (4) ventrals in males, 145-149 (146) in females, 152-159 (155); and (5) dorsal coloration essentially uniform dark gray or brown [from SAVAGE 1960].|
Diagnosis. Atractus carrioni can be distinguished from all congeners by the following combination of characters: (1) 15 smooth dorsal scale rows; (2) single postocular; (3) loreal absent; (4) temporals usually 1+1; (5) usually six supralabials, third and fourth contacting orbit; (6) usually six infralabials, first four contacting chinshields; (7) eight to ten maxillary teeth; (8) usually three gular scale rows; (9) usually four pre-ventrals; (10) 143–161 ventrals in females, 136–151 in males; (11) 18–28 subcaudals in females, 25–33 in males; (12) dorsum of body uniformly gray to grayish brown; (13) venter usually brown to grayish brown, occasionally brown pigment restricted to mid portion of ventral scales in which the lateral areas are cream; (14) moderate body size, females reaching 495 mm SVL, males 350 mm; (15) small to moderate tail in females (8.0–14.7% of SVL), moderate to long in males (9.9–17.2% of SVL); (16) hemipenis moderately bilobed, semicapitate and semicalyculate [Passos 2013: 111].
|Comment||Similar species: A. roulei. The two species differ primarily in the presence in roulei and absence in carrioni of the loreal shield.|
|Etymology||Named after Professor Clodoveo Carrión Mora (1883-1957), and Ecuadorian natural scientist and paleontologist. After studying in Manchester and London, he returned to Ecuador he became Professor of Natural Sciences at the Colegio Bernardo Valdevisio. He collected the holotypes of the species.|
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