Additional file 1: of Insights into the segmental identity of post-oral commissures and pharyngeal nerves in Onychophora based on retrograde fills Christine Martin Georg Mayer 10.6084/m9.figshare.c.3636128_D1.v1 https://springernature.figshare.com/articles/dataset/Additional_file_1_of_Insights_into_the_segmental_identity_of_post-oral_commissures_and_pharyngeal_nerves_in_Onychophora_based_on_retrograde_fills/4440629 Scenario on the evolution of the arthropod brain. Animation, swf file. Anterior is up. The compound brain of arthropods (sensu Richter et al. [5]) most likely evolved by a fusion of initially separate proto-, deuto- and tritocerebral ganglia. Note that the tripartite brain of arthropods alternatively might have evolved several times independently, as some groups, including branchiopod crustaceans, show a bipartite brain (e.g. [29]). 2015-08-25 05:00:00 Central nervous system Brain Pharynx Neuronal tracing Arthropod Panarthropod