Modalità di alimentazione delle larve immature dei Dryinidae (Hymenoptera Chrysidoidea): stato delle conoscenze e nuovi reperti

Abstract

Feeding habits of Dryinidae immature larvae are discussed. Known data are insufficient and sometimes conflicting also into the same subfamily. Apparently, feeding habits vary according to different subfamilies. In Aphelopinae, immature larvae absorb the nutrients from host haemolymph by special tissue surrounding the anterior region of the body (in Aphelopus) or the entire body (in Crovettia). In Dryininae and Gonatopodinae, immature larvae absorb the food by a pair of cephalic vesicles; in Anteoninae and Bocchinae with intermediate mode. Besides, in some subfamilies, the nutrients seem to be carried to their alimentary canal, while in other ones is very probably that they pass directly into the haemolimph of the larva without entering the gut. In particular, in these last subfamilies the digestive role of the mid-gut is to check while its excretory role seems to be sure.