Scale variation in a laboratory colony of amelanistic diamondback rattlesnakes (Crotalus atrox)

Publication Type:
 Journal Article
Year of Publication:
 1994
Authors:
 William B. McCrady, James B. Murphy, Clay M. Garrett, David T. Roberts
Publication/Journal:
 Zoo Biology
Publisher:
 A Wiley Company, Inc., Wiley Subscription Services
Keywords:
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ISBN:
 1098-2361
Abstract:

Abstract 10.1002/zoo.1430130202.abs Inbreeding for 6 generations has produced a strain of amelanistic western diamondback rattlesnakes (Crotalus atrox) with extremely variable scalation. Forty-four siblings varying from virtually no body scalation to normal scalation have been produced in the latest generation. Two of the 3 most extreme “scaleless” snakes were stillborn; the third was maintained for > 1 year. Two of 7 snakes with greatly reduced head and body scales have died; however, the remaining 5 are being maintained and appear to be growing and healthy at 5 or 6 years of age. All snakes with reduced body scales have abnormal ventral scutes. Fifteen snakes with predominantly normal body scales have anomalous head scales, head scale patterns, and ventral scutes. One snake has predominantly normal scalation except for aberrant ventrals. A total of 18 Generation VI snakes have been classified as “normal,” although all snakes were not closely examined before disposition. Nine of the more normally scaled generation VI snakes are also being maintained in the laboratory. It is difficult to separate the genetic and environmental components of these phenotypes with existing information; however, it seems apparent that more than a single locus is involved. © 1994 Wiley-Liss, Inc.

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