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The subfamilies and genera of the Crotalidae
Spatial and temporal clines and a determination
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accounted adjacent affect albolabris alternative apparently arranged assumed azygous scales become body brown characters clines closely color colubrid completely concerned condition continuous crotalid crown demonstrated derived described distance dorsal equilibrium evolution examined exist extend factors field four fragmentation frequently further fusion genera genes genus give gradients green head scales head shields hypothesis included increase India influence initiation involved Islands keeled lateral less levels loss macrolepis median modification nasal normal number of scale º º occur organ original pattern phenotype plates pore position possesses possible posterior present primary probably produced prototype reduction region relatively represent result rise rows at midbody scale row second labial secondary seems selection separated similar single smaller snakes species suggested supraoculars termination third tips upper usually various ventral vertebral width