Atractus trihedrurus AMARAL, 1926
Can you confirm these amateur observations of Atractus trihedrurus?
Atractus trihedrurus
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| Higher Taxa | Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Southern Ground Snake Portuguese: Cobra-da-Terra, Coral, Coral-Falsa |
| Synonym | Atractus trihedrurus AMARAL 1926: 105 Atractus trihedrurus — AMARAL 1978: 117 Atractus trihedrurus — PASSOS et al. 2005 Atractus trihedrurus — WALLACH et al. 2014: 82 Atractus trihedrurus — NOGUEIRA et al. 2019 |
| Distribution | S Brazil (São Paulo south to Santa Catarina), elevation between 500–1400 m. Type locality: Southern Brazil |
| Reproduction | oviparous |
| Types | Holotype: IBSP (= IB) 3098, adult male |
| Diagnosis | Diagnosis: Atractus trihedrurus is distinguished from all congeners by the following combination of characters: (1) 17/17/17 smooth dorsal scale rows; (2) generally two postoculars; (3) loreal moderate to long; (4) temporals 1+2; (5) generally seven supralabials, third and fourth contacting chinshields; (6) seven infralabials, first four contacting chinshields; (7) eight to ten maxillary teeth; (8) generally three gular scale rows; (9) generally three preventrals; (10) 146–159 ventrals in females, 136–150 in males; (11) 16–23 subcaudals in females, 23–29 in males; (12) dorsum uniformly beige, grayish brown, or black in adults and beige or creamish red with black bands in juveniles and sub-adults; (13) venter creamish brown to uniformly black; (14) large body size, with females reaching 1010 mm SVL and males 735 mm SVL; (15) tail short in females (7.3–10.7% SVL), moderate in males (9.6–15.5% SVL); (16) hemipenis moderately bilobed, semicapitate, and semicalyculate [from Passos et al. 2010]. Additional details (1157 characters) are available for collaborators and contributors. Please contact us for details. |
| Comment | According to SAVAGE (1960: 31) probably not an Atractus. Status unclear until holotype will be re-examined. Habitat: Upper Montane Rainforest. Similar species: A. zebrinus (for examples of misidentifications see Passos et al. 2022). |
| Etymology | Named after Greek triedro (τρίεδρο), geometric figure composed of three planes meeting at a single point + + Greek oura (ουρα), tail. ["...Cauda curta, em forma de pyramide triangular…"]. |
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