Preventral scales

Preventral scales are snake scales positioned anterior to the ventral scales and are wider than they are long, but do not come into contact with the paraventral row of dorsal scales on either side of the body.[1]

References
  1. Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. 2 volumes. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.
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