All neuropils of the central complex clearly correspond between Drosophila (iii) and other insects, with the central body upper unit (CBU) being equivalent to the fan-shaped body (FB) and the central body lower unit (CBL) matching the ellipsoid body (EB). For the associated neuropils of the lateral complex, the correspondence is not completely obvious. Whereas the gall (GA) and the bulb (BU) are easily identified in most insects (GA reduced in locusts; BU often consisting of several parts), the lateral accessory lobe (LAL) appears to contain parts of the crepine (CRE) region of Drosophila in other insects. In locusts (i), all or most of the upper LAL (ULAL) seems to correspond to the fly's CRE, whereas in moths and butterflies (ii) the parts of the LAL immediately surrounding the mushroom body medial lobe likely correspond to parts of the CRE. This correspondence on the level of brain regions can be extended to the identity of single neuron types and names of identified homologues across species are given in the table below.
For comprehensiveness, discontinued, former names of neuropils are shown in brackets. Images in (i) and (ii) are from www.insectbraindb.org; data are from el Jundi et al. (2009) (locust) and de Vries et al. (2017) (bogong moth). Drosophila data are courtesy of Arnim Jenett (Tefor Core Facility, Université Paris-Saclay, France). BU, bulb; CBL, central body lower unit; CBU, central body upper unit; CRE, crepine; EB, ellipsoid body; FB, fan-shaped body; GA, gall; LAL, lateral accessory lobe; LBU, lateral bulb; LLAL, lower LAL; MBU, medial bulb; NO, noduli; PB, protocerebral bridge; ULAL, upper LAL.
