Prominent lobed neuropils found in annelids and all arthropods except crustaceans. They are thought to be involved in olfactory associative learning and memory[MESH] Mushroom body neuropils are divided into calyces, pedunculus, and its subsequent lobes. In Drosophila these are the alpha, beta, and gamma lobes.
Comment:
[taxon-note] "Also in annelids. 'Comparison to the vertebrate pallium reveals that the annelid mushroom bodies develop from similar molecular coordinates within a conserved overall molecular brain topology and that their development involves conserved patterning mechanisms and produces conserved neuron types that existed already in the proto- stome-deuterostome ancestors. These data indicate deep homology of pallium and mushroom bodies and date back the origin of higher brain centers to prebilaterian times'" xsd:string {source="PMID:20813265"}