The scalation usually includes 21 rows of dorsal scales at midbody, all of which are keeled except the lowermost on the anterior part of the body.
The scalation usually includes 21 rows of dorsal scales at midbody, all of which are keeled (although the keels on the first scale rows are faint), 146-157 ventral scales, and 39-54 subcaudal scales.
Keelbacks are Colubrid snakes of the subfamily Natricinae, so named because their dorsal scales exhibit strong keeling.
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