Undivided anal scale of anelapid.Divided anal scale ofPtyas mucosus, acolubrid. See the undivided ventral scales to its left and the divided caudal scales to the right.
Insnakes, theanal scale oranal plate is the scale just in front of and covering thecloacal opening. This scale can be either single ("anal entire") or paired ("anal divided"). When paired, the division is oblique.[1][2] The anal scale is preceded by theventral scales and followed by thesubcaudal scales.
^Mallow D, Ludwig D, Nilson G (2003).True Vipers: Natural History and Toxicology of Old World Vipers. Malabar, Florida: Krieger Publishing Company. 359 pp.ISBN0-89464-877-2.
^Wright AH, Wright AA (1957).Handbook of Snakes of the United States and Canada. Ithaca and London: Comstock Publishing Associates. (7th printing, 1985). 1,105 pp. (in two volumes).ISBN0-8014-0463-0.
