Structure and ultrastructure of unusual placoid sensella (PS) in female Megaphragma amalphitanum A–G SEM H 3D-reconstruction I, J FIB-SEM A third flagellomere bearing PS B, C PS wall sputtered with gold, sputtering thickness 20–25 nm D, E PS wall sputtered with chromium in ESEM mode F, G PS wall sputtered with gold, sputtering thickness 15 nm, orbital rotation with an inclination of up to 45° I cross section through the middle of PS J cross section through the outgrowth of PS H three-dimensional reconstruction of PS and one of the sensory neurons. Abbreviations: cu – cuticle, de – dendrite, le – ledge, nb – neuron body. Arrows designate the locations of the pores.