Abstract

Fangs of 1446 snakes of the genera Agkistrodon, Calloselasma, Deinagkistrodon and Hypnale were examined for structural changes and growth rates. Fang growth is closely correlated to increases in body and head length. Growth rates and changes in structural proportions of fangs are rather constant. In mean and maximum fang lengths snakes of the Agkistrodon-complex fall intermediate between the elapids and rattlesnakes, and most are similar to those of Vipera russellii. No sexual dimorphism in fang lengths was found. Changes in such fang proportions as thickness, lengths of the entrance lumen, discharge orifice and point distal to the discharge orifice are closely correlated with fang length. Fang replacement patterns and rates are discussed and compared to those of rattlesnakes and V. russellii.

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