Amnisiophis amoena (JAN, 1863)
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|Higher Taxa||Colubridae (Dipsadinae, Echinantherini), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)|
|Synonym||E. [nicognathus] amoenus JAN 1863: 270|
Enicognathus amoenus — JAN 1866
Aporophis amoenus — BOULENGER 1894
Lygophis amoenus — AMARAL 1929: 169
Lygophis amoenus — PETERS & OREJAS-MIRANDA 1970: 185
Liophis amoenus Incertae sedis — DIXON 1980
Echinanthera amoenus — DI BERNARDO 1992
Echinanthera amoena — SCHARGEL et al. 2005
Echinanthera amoena — WALLACH et al. 2014: 253
Echinanthera amoena — NOGUEIRA et al. 2019
|Distribution||SE Brazil (from S Minas Gerais to S Paraná; Sao Paulo, Rio de Janeiro)|
Type locality: "Patria?" [=Unknown].
|Types||Holotype: MSNM, a 590 mm specimen.|
|Diagnosis||Diagnosis (genus): “Amnisiophis amoenus can be distinguished by (1) usually eight supralabials, with 2nd–3rd touching the loreal and 3rd–5th touching the orbit; (2) 17/17/17 dorsal scale rows, usually with one or two apical pits; (3) a dorsal color that shifts from green on the back of the head and first third of the body to brown on the midbody and dark brown on the posterior part;(4)midventralportionwithtransversebandsatthebase of the ventral scales, especially observable in adults; (5) dorsal scales of the 3rd row with a light spot forming a continuous line from the anterior part of the body toward the tail; (6) hemipenis slightly bilobed, with an interspinal asulcate gap and absence of an enlarged proximal spine; (7) supratemporals usually contact parietal; (8) dorsolateral crests of the parietal conspicuous and abruptly tapered in the posterior region, close to the contact with supraoccipital; (9) parabasisfenoid lateral crests conspicuous; (10) large number of maxillary (27–33), palatine (20–21), pterygoid (31–33) and dentary teeth (34–36) (Figures 3D, 5G, 7B, 8A and Table 1).” (Abegg et al. 2022)|
|Comment||belongs to the “Rhadinaea brevirostris group” sensu Myers (1974)|
Type species: E. [nicognathus] amoenus JAN 1863: 270 is the type species of the genus Amnisiophis Abegg et al. 2022.
|Etymology||Named after Latin “amoenus” = pleasing or lovely.|
The genus was named after the Latin word amnis (stream of water, river) and the Greek word oφις (ophis =snake) (Liddell and Scott, 1883; Brown, 1954). This name was chosen in reference to the habit of the monotypic species A. amoenus, whose individuals inhabit the margins of forest streams. The genus name is masculine.
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