Abstract
Tobacco alkaloids of the anabasine type have been found or confirmed in the venom of five species of arid-dwelling Messor ants. They are frequently accompanied by alkylpyrazines. Messor mediorubra contains four alkaloids, with anabasine the major component and also minor pyrazines. Anabasine was found alone in the venom of Messor semirufus and confirmed in Messor ebeninus. Messor rugosus from Tel Aviv contained a mixture of alkaloids and pyrazines, but those from Ein Yahav contained 3-ethyl-2,5-dimethylpyrazine, some 2-phenylethylamine, and N-ethylidene 2-phenylethylamine. Messor arenarius is confirmed as having a complex but variable mixture of alkaloids and pyrazines.
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