Ch3co Ch3co H

Figure 10.18 Dihydromatricaria acid is found in cantharid beetles feeding on Compositae which contain polyacetylenic acids. Lucibufagins are similar to cardenolides, sequestered by fireflies. Romallenone is present in the defensive foam of a grasshopper

The grasshopper Romalea microptera discharges a foam from glands when disturbed. The principal constituent of the foam is romallenone (Figure 10.18) an allenic sesquiterpene. This compound is thought to be

salicyl alcohol salicylaldehyde salicin

Figure 10.19 Two chrysomelid beetles (Thratora vitellinae and Chrysomela tremulaej produce salicylaldehyde as a defensive secretion.

a degradation product of carotenoids (see Chapter 7) from its food plants. Two chrysomelid beetles (Phratora vitellinae and Chrysomela tremulae) produce salicylaldehyde as a defensive secretion (Figure 10.19). They both feed on willow and poplars, which produce salicin, which they have been shown to convert to salicylaldehyde.

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