Cell types are defined as all neurons that are morphologically indistinguishable. In many cases, a cell type comprises an individual neuron, while in other cases, several neurons with identical morphologies comprise a cell type. For highly organized brain regions, cell types can be grouped into higher order categories. (A). Three cell types of the Monarch butterfly central complex (CX), which differ in their innervated columns, overall morphology, detailed location of dendrites and axonal branching patterns. (B). Cell types that only differ in the innervated CX column are grouped into a super-type. (C). Several super-types can be grouped into a neuron family. (D). Illustration of neuron classes: CX neurons, for example in dung beetles can be grouped in three classes (columnar CX neurons, tangential CX neurons and pontine neurons). (E). Corresponding neurons in different brain hemispheres are treated as separate cell types, but are cross linked in the database. (F). The neuron name is composed of a species prefix, hemisphere suffix (both automatically generated) and a user defined neuron name. Alternative names can be assigned to the neuron, for example to refer to older naming schemes or names from different species. Those names are automatically queried as well, when searching for neuron names. Note that the hemisphere suffix is not used for columnar CX neurons, as hemisphere is already identified via the innervated CX column. Data from Heinze et al., 2013 (A–C), El Jundi et al., 2018 (D), and Stone et al., 2017 (E); all visualizations generated with Insectbraindb.org.