Fig. 4

Histaminergic neurons in the ventral nerve cord of Xibalbanus tulumensis. Maximum projections of cLSM stacks (ventral view, anterior to the top). a Overview of the ganglia 7 and 8 (G7–8), showing the typical rope-ladder like arrangement and the variability concerning number and distribution of the histaminergic cell bodies. b Close-up of a representative hemiganglion, depicting anterior (AC), laterocentral (LCC), medial (MC) and posterior cell bodies (PC). c The cluster of anterior AC contained up to five immunoreactive neurons. Abbreviations: AC: anterior cell bodies; G7–8: ganglion 7–8; ISN: intersegmental nerve; LCC: laterocentral cell bodies; MC: medial cell bodies; PC: posterior cell bodies; SN: segmental nerve. Scale bars: a: 100 μm; b, c: 25 μm