Published in "Journal of Comparative Neurology 526 (14): 2301–2318, 2018" which should be cited to refer to this work. GABA immunostaining in the central complex of dicondylian insects Uwe Homberg | Tim-Henning Humberg* | Jutta Seyfarth | Katharina Bode | Manuel Quintero Pérez Faculty of Biology, Animal Physiology & Center for Mind, Brain and Behavior - CMBB, Abstract Philipps-Universität Marburg, Marburg, The central complex is a group of midline-crossing neuropils in the insect brain involved in head Germany direction coding, sky compass navigation, and spatial visual memory. To compare the neuroarch- Correspondence itecture and neurochemistry of the central complex in insects that differ in locomotion, ways of Uwe Homberg, Faculty of Biology, Animal Physiology, Philipps-Universität Marburg, D- orientation, time of activity (diurnal, nocturnal), and evolutionary history, we studied the distri- 35032 Marburg, Germany. bution of γ-aminobutyric acid (GABA) immunostaining in the central complex of 29 species, Email:
[email protected] ranging from Zygentoma to Diptera. In all species, the lower division of the central body was Present address densely innervated by GABA-immunoreactive tangential neurons. These neurons had additional *Department of Biology, University of arborizations in the bulb, a distinct region of synaptic complexes in the lateral complex, and Fribourg, CH-1700 Fribourg, Switzerland somata in a cell cluster mediodorsally to the antennal lobe. Differences in the appearance of Funding information Deutsche Forschungsgemeinschaft, Grant/ GABA immunostaining in the lower division of the central body corresponded to differences in Award Number: HO 950/24-1 neuropil architecture, such as transformation of the lower division into a toroid in certain Dip- tera and Heteroptera.