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Species identification using scales requires a fair degree of knowledge about snakes, their taxonomy, snake-scale nomenclature as well as familiarity with and access to scientific literature. Distinguishing by using scale diagrams whether a snake is venomous or not in the field cannot be done in the case of uncaught specimens.
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The shape and arrangement of scales is used to identify snake species. The shape and number of scales on the head, back and belly are characteristic to family, genus and species. Scales have a nomenclature analogous to the position on the body. In "advanced" (Caenophidian) snakes, the broad belly scales and rows of dorsal scales correspond to ...
Scales usually vary in size, the stouter, larger scales cover parts that are often exposed to physical stress (usually the feet, tail and head), while scales are small around the joints for flexibility. Most snakes have extra broad scales on the belly, each scale covering the belly from side to side.
In snakes, the subcaudal scales are the enlarged plates on the underside of the tail. [1] These scales may be either single or divided (paired) and are preceded by the anal scale . Related scales
Nomenclature of scales (top view of head) Parietal scales are the scales of a snake located on the snake's head and are connected to the frontals towards the posterior. [1] These plate-like scales are analogous to and take their name from the parietal bone, which forms the roof and sides of the cranium in humans.
Scales on a snake's head. Frontal scale refers to the scale of a reptile which lies on the top of the head in the region between the eyes. This is analogous to the frontal bone of a human which corresponds to the forehead. [1] Snake scales adjacent to the frontal and to its anterior are called prefrontals.
In snakes and amphibians, the canthus, canthal ridge or canthus rostralis, [1] is the angle between the flat crown of the head and the side of the head between the eye and the snout, [2] or more specifically, between the supraocular scale and the rostral scale.