ArticleBMC neuroscience2015
Insights into the segmental identity of post-oral commissures and pharyngeal nerves in Onychophora based on retrograde fills.
Article in BMC neuroscience, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed, 15 citations in OpenAlex.
- The velvet worm brain unveils homologies and evolutionary novelties across panarthropods.BMC biology · 2022Article
- Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head.Nature communications · 2018Article
- The functional head of the Cambrian radiodontan (stem-group Euarthropoda) Amplectobelua symbrachiata.BMC evolutionary biology · 2017Article
- The nervous and visual systems of onychophorans and tardigrades: learning about arthropod evolution from their closest relatives.Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology · 2017Review
- Assessing segmental versus non-segmental features in the ventral nervous system of onychophorans (velvet worms).BMC evolutionary biology · 2017Article
- Unlocking the early fossil record of the arthropod central nervous system.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2015Review
- Embracing the comparative approach: how robust phylogenies and broader developmental sampling impacts the understanding of nervous system evolution.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2015Review
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Authors and funding
2 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
backgroundWhile the tripartite brain of arthropods is believed to have evolved by a fusion of initially separate ganglia, the evolutionary origin of the bipartite brain of onychophorans-one of the closest arthropod relatives-remains obscure. Clarifying the segmental identity of post-oral commissures and pharyngeal nerves might provide useful insights into the evolution of the onychophoran brain. We therefore performed retrograde fills of these commissures and nerves in the onychophoran Euperipatoides rowelli.
resultsOur fills of the anterior and posterior pharyngeal nerves revealed groups of somata that are mainly associated with the deutocerebrum. This resembles the innervation pattern of other feeding structures in Onychophora, including the jaws and several lip papillae surrounding the mouth. Our fills of post-oral commissures in E. rowelli revealed a graded arrangement of anteriorly shifted somata associated with post-oral commissures #1 to #5. The number of deutocerebral somata associated with each commissure decreases posteriorly, i.e., commissure #1 shows the highest and commissure #5 the lowest numbers of associated somata, whereas none of the subsequent median commissures, beginning with commissure #6, shows somata located in the deutocerebrum.
conclusionsBased on the graded and shifted arrangement of somata associated with the anteriormost post-oral commissures, we suggest that the onychophoran brain, which is a bipartite syncerebrum, might have evolved by a successive anterior/anterodorsal migration of neurons towards the protocerebrum in the last onychophoran ancestor. This implies that the composite brain of onychophorans and the compound brain of arthropods might have independent evolutionary origins, as in contrast to arthropods the onychophoran syncerebrum is unlikely to have evolved by a fusion of initially separate ganglia.
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