Abstract
GDH isozyme patterns from thoracic muscle of 21 species of Bombus and 4 species of Psithyrus are each characterized by at least 8 bands arranged in 3 isozyme groups. Four distinctive pattern types were found, one for the species of Psithyrus and three among the Bombus species analyzed. Phenetic groupings of the 25 species are presented. Tissue specific GDH patterns are reported. No quantitative or qualitative differences in GDH patterns from thoracic extracts were associated with caste or age. The enzymes appear to be controlled by four non-allelic genes.
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