Fig 1. Representative recordings of electrophysiological activity of the coeloconic sensillum on the distal tip of the unpaired ovipositor valve of Leptopilina heterotoma to haemolymph of Drosophila larvae of different parasitization status, using the extracellular tip-recording technique.

(a) Response to haemolymph of an unparasitized larva (UP). (b) Response to haemolymph of a larva containing one L. heterotoma egg (1P). (c) Response to haemolymph of a larva containing two L. heterotoma eggs (2P). (d) Magnified detail from c, to illustrate the occurrence of doublets (D) and triplets (T).