Apical - the scale or scales lying at the tip of the snout, in contact with the rostral scale.

Canthal - the scale or scales which constitute the Canthus rostralis

Canthus rostralis - area between the supraocular and the rostral which forms a prominent ridge on both sides of the snout.

Circumoculars - scales bordering the eye (see also perioculars).

Dorsal - scale or scales which cover the snake´s body.

Frontal - plate or scale lying on top of the head between the supraoculars.

Gular - Pertaining to the throat region or ventral surface of the neck.

Infralabials - the series of scales along the lip of the lower jaw, exclusive of the mental scale.

Keeled - used in reference to scales that possess a median ridge. All viperids have keeled scales.

Mental - triangular scale at the anterior edge of the lower jaw or chin.

Paraventrals - scales composing the first row of dorsal scales on either sides of the ventrals.

Parietals - a pair of large scales on the back of the dorsum of the snake´s head. In most vipers the parietals are fragmented into many small scales.

Perioculars - scales bordering the eye.

Pholidosis - account and arrangement of the scales on a reptile.

Plates - large flat scales on top of the snake´s head or belly.

Preventrals - scales lying anteriorly in the ventral series, but not in contact on both sides with the paraventral row of dorsal scales.

Rostral - vertical scale covering the anterior tip of the snout in the upper jaw.

Subcaudals - scales lying on the ventral side of the tail, immediately after the cloacal plate.

Supralabials - the series of scales along the lip of the upper jaw, exclusive of the rostral scale.

Supraocular - placa situada en la parte superior de cada ojo.

Ventrals - elongated plates or scales covering the belly from the neck to the cloacal plate.

Viperid - viper, a snake in the family Viperidae.

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