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{{r|Rostral scale}}

On the head, the [[rostral scale]] is wider than it is long, supporting a rostral appendage or "horn" covere

{{r|Rostral scale}}

...single [[nasal scale]]. There are 2-3 apical scales in contact with the [[Rostral scale|rostral]]. There is normally 1 canthal scale on either side of the head. Th

|style="width:40%"|Scales separating [[nasal scale|nasal]] and [[rostral scale|rostral]]

...is short and wide and the snout is prominent, pointed and upturned. The [[rostral scale|rostral]] is large. The eyes are medium sized. The [[circumorbital ring]] c

...gnized by a set of 3-5 horn-like superciliary scales above each eye. The [[rostral scale]] has more than twice the length of its width. It has 9 [[upper labials]].

...upralabials]] by 2. [[Upper labials]]: 10-12. [[Sublabials]]: 11-14. The [[rostral scale]] is not as wide as it is long, while its upper margin is highest at the ce

...://www.toxinology.com/ Clinical Toxinology]. Accessed 23 May 2012.</ref> [[Rostral scale|Rostral]] once and a half as broad as deep, just visible from above; intern

...the neck. The snout is rounded and covered with small keeled scales. The [[Rostral scale|rostal]] is in contact with 2-3 apical scales. The eyes are in broad contac

...rge gape. The head is thickly covered with keeled, imbricate scales. The [[rostral scale]] is not visible from above. A very small scale just above the rostral is f

...ned dorsolaterally and have valves. The [[nasal scale]] is unbroken. The [[rostral scale]] is small and wide. The eyes are small to average in size. There are 15-20

The snout is obtuse with a rounded [[rostral scale]]. A single [[Loreal scale|loreal]] is present. The [[circumorbital ring]]

...rom the [[Rostral scale|rostral]] by a single [[nasorostral scale]]. The [[rostral scale]] is wider than it is long.<ref name="Mal03"/> ...distinctive characteristic is a single "horn" on the snout, just above the rostral scale. It consists of 9-17 scales arranged in 2 (rarely 2 or 4) transverse rows.<

...the neck. The tip of the snout is slightly but distinctly upturned. The [[rostral scale]] is generally higher than it is wide, touching 2 to 3 scales on the upper

...us (snake)|canthus]] is also distinct. A number of species have enlarged [[Rostral scale|rostral]] or [[supraocular scales]] that look like horns. The eyes are rela

...while in Central America it is larger with a bluntly rounded snout. The [[rostral scale]] is more or less triangular and may be as wide or wider than it is high. T

...black rings separated by narrow yellow rings. The head is black from the [[rostral scale|rostral]] to just behind the eyes. The red rings are usually speckled with

...scales. The nostrils are a pair of small slits. It has a characteristic [[rostral scale]], that is wider than it is high, strongly concave and bordered above and t

...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