Abstract
A calcium dependent apyrase activity (ATP→AMP + 2Pi) has been characterized in the salivary secretion of Rhodnius prolixus. High levels of this activity were found in the crop of all stages of larvae and the adults after a single blood or saline meal. The activity persisted for several days but was totally absent in the crop insects from which the salivary glands had been removed. The use of this activity as a saliva marker shows that the insect salivates during the whole meal and most of the saliva is ingested with the food. The physiological role of this activity is discussed. A simple method for saliva collection and a technique for the surgical ablation of the salivary glands in adult insects are described.
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