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...have pupils that are round instead of elliptical like other vipers. The [[rostral scale]] is broad, sometimes pointed or upturned. The nostril is located between 2

...f the the snout is usually raised into a low ridge. Seen from above, the [[rostral scale]] is not visible, or only just. Immediately behind the rostral, there are 2

...th a blunt and rounded snout. Still, it is much wider than the neck. The [[rostral scale]] is small. The [[circumorbital ring]] consists of 10–16 scales. Across t

...scent shape and separates the nasal from the nasorostral anteriorly. The [[rostral scale|rostral]] is as broad as it is high.<ref name="Mal03"/>