Sibon anthracops (COPE, 1868)
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|Higher Taxa||Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes)|
|Common Names||E: Cope's Snail Sucker|
G: Südamerikanische Schneckennatter
|Synonym||Leptognathus anthracops COPE 1868: 136|
Sibynomorphus ruthveni BARBOUR & DUNN 1921 (fide KOFRON 1987)
Sibynomorphus anthracops — AMARAL 1929
Dipsas anthracops — TAYLOR 1954
Sibon anthracops — VILLA et al. 1988
Sibon anthracops — MCCRANIE 2006
Sibon anthracops — WALLACH et al. 2014: 667
|Distribution||Guatemala, El Salvador, Nicaragua, Honduras, Costa Rica|
Type locality: “Central America”
|Types||Holotype: ANSP 10134|
Holotype: MCZ 15549 [ruthveni]
|Diagnosis||Description. “The following is based on two males (LSUMZ 23829; UF 142714) and two females (USNM 565822; UTA R-53277). Sibon anthracops is a moderately small, ringed snake (maximum recorded TOL 664 mm [LSUMZ 23829]) with a long tail; head very distinct from neck; snout short, blunt in dorsal outline; rostral not extending posteriorly between intemasals, its length from above about one-quarter that of median (but slightly sinistral relative to median prefrontal suture) intemasal suture; intemasals short, about two-thirds length of prefrontal suture; prefrontals long, their median suture about three-quarters length of frontal; prefrontals border ing eye above loreal; frontal longer than wide, widest anteriorly, length about three-quarters that of parietals, in contact with prefrontals, supraoculars, and parietals; supraoculars longer than wide, as long as frontal; parietals long, wide, widest anteriorly, their median suture longer than frontal; parietals in contact with frontal, supraoculars, upper postocular, anterior and upper secondary temporals, and about 7 nuchal scales; nasal single or semidivided, in contact with first and second supralabials, loreal, prefrontal, internasal, and rostral; loreal single, longer than high, length nearly half that of snout, about three-quarters length of eye; loreal bordering eye; preocu lars and subpreoculars absent; postoculars usually 2 (rarely 3), upper (when 2 present) smaller than lower; temporals 1+2, anterior one usually above seventh supralabial, lower secondary one usually above eighth supralabial; no temporals bordering eye; supralabials 7-8, with third, fourth, and fifth, fourth, fifth, and sixth, or fourth and fifth bordering eye (enlarged penultimate supralabial separated from eye by lower postocular); pupil vertically elliptical; infralabials 7-9, first pair in contact posterior to mental (postmental absent), first 6 or first 5 infralabials in contact with anterior chinshields; anterior edge of first sublabial contacting ultimate gular scale; anterior chinshields paired, longer than wide, longer than posterior chinshields; posterior chinshields paired, in broad contact medially; mental groove weak, but present; ventrals 166-168 (167.0) in males, 162-169 (165.5) in females [162-188 both sexes combined range-wide]; cloacal scute entire; subcaudals 82-85 (83.5) in males, 69-80 (74.5) in females [69-91 both sexes combined range-wide], divided; ventrals plus subcaudals 248-253 (250.5) in males, 231-249 (240.0) in females; dorsal scales smooth, in 13 rows throughout body, without apical pits or supracloacal ridges; vertebral row not enlarged; TOL 594-664 (629.0) mm in males, 468-475 (471.5) mm in females; SVL420-511 (465.5) mm in males, 335-348 (341.5) mm in females; TAL/ TOL 0.230-0.293 in males, 0.267-0.284 in females.” (McCranie 2011)|
Color in life of an adult male (UF 142714): “dorsum with series of elongate Jet Black (89) rings, the right and left portions sometimes longitudinally offset from one another ventrally; interspaces Cream Color (54) laterally and ventrally. Chrome Orange (16) dorsally, Chrome Orange becomes more extensive about one-third of way onto body; head Jet Black (89) from snout posteriorly onto two-thirds of parietals; nuchal band Cream Color with slight Chrome Orange smudging middorsally, nuchal band extending from posterior edges of parietals onto first two nuchal scale rows; iris Jet Black.” (McCranie 2011)
Diagnosis/Similar Species. “Sibon anthracops can be distinguished from all other Honduran snakes, except Sibon carri, in having smooth dorsal scales in 13 rows throughout the body. Sibon carri lacks a primary temporal, has the fifth supralabial in contact with the parietal, and a rust red body with dark crossbands (versus primary temporal present, fifth supralabial separated from parietal, and ringed body in S. anthracops).” (McCranie 2011)
|Comment||Synonymy partly after KOFRON 1985 and 1987.|
Harvey et al. 2008 reported a specimen from Colombia that may be in error.
Habitat: fully arboreal (Harrington et al. 2018).
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