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Fig. 5. PETH-immunoreactive Inka cells of holometabolous pharate adults. Only one
large Inka cell attached to tracheae near each spiracle was found in (A) the
Colorado potato beetle Leptinotarsa (Coleoptera), (B) the sawfly
Trichiocampus (Hymenoptera) and (C) the ant Myrmica
(Hymenoptera). (D) Tracheae of another hymenopteran, the honey bee
Apis, contained a large number of small cells. (E,F) Single Inka
cells were attached to longitudinal tracheae near each spiracle in dipterans:
the black fly Simulia (E) and the fruit fly Drosophila (F).
Scale bar, 50 µm.