The lacunolabial scale is a large
scale
Scale or scales may refer to:
Mathematics
* Scale (descriptive set theory), an object defined on a set of points
* Scale (ratio), the ratio of a linear dimension of a model to the corresponding dimension of the original
* Scale factor, a number ...
that forms in some
crotaline snakes (pitvipers) when the
prelacunal scale fuses with the second (rarely the third)
supralabial scale
In reptiles, the supralabial scales, also called upper-labials, are those scales that border the mouth opening along the upper jaw. They do not include the median scaleWright AH, Wright AA. 1957. Handbook of Snakes. Comstock Publishing Associates ( ...
. In such cases, it is often said that "the second labial enters the pit".
[Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. 2 volumes. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. .] Some pitvipers, such as
Bothrops alternatus
:''Common names'': yarará grande, urutu,Campbell JA, Lamar WW. 2004. ''The Venomous Reptiles of the Western Hemisphere''. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. . wutu,Brown JH. 1973. ''Toxicology and Pharmacolog ...
,
Bothrops erythromelas,
Bothrops itapetiningae and
Bothrops neuwiedi
:''Common names: Neuwied's lancehead, Silva VX da (2004). "The ''Bothrops neuwiedi'' complex". ''In'': Campbell JA, Lamar WW (2004). ''The Venomous Reptiles of the Western Hemisphere''. Ithaca and London: Comstock Publishing Associates. 870 pp. ...
, have a divided lacunolabial scale.
References
{{Reflist
Snake scales