Distribution of serotonin in the trunk of Metaperipatus blainvillei (Onychophora, Peripatopsidae): implications for the evolution of the nervous system in Arthropoda

The Journal of Comparative Neurology
Georg Mayer, Steffen Harzsch

Abstract

Onychophora ("velvet worms") are a key taxon in the discussion of arthropod phylogeny. Studies that analyze neuroanatomical characters against a phylogenetic background have recently provided new insights into this debate. However, to date only a few studies on nervous system organization, particularly in the trunk, are available in Onychophora. To close this gap and to compare the onychophoran nervous system with that of other bilaterians, we have analyzed the pattern of serotonin-like immunoreactivity in Metaperipatus blainvillei (Peripatopsidae). In addition to confirming previous histological observations, our experiments revealed many new aspects of nervous system organization in Onychophora. The serotonergic nervous system of M. blainvillei consists of five longitudinal nerve strands (the paired dorsolateral nerves, the heart nerve, and the paired ventral cords), which are interconnected at regular intervals by ring commissures as well as median commissures. The ring commissures are absent in the leg-bearing regions. In addition to the main nerve tracts, there are several extensive fiber networks innervating the integument, the nephridial organs, and the body musculature. The leg nerves and nephridial nerves represent the...Continue Reading

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Citations

Nov 11, 2010·Frontiers in Zoology·Stefan RichterSteffen Harzsch
Mar 22, 2013·PloS One·Georg MayerPaul A Stevenson
Feb 15, 2011·Arthropod Structure & Development·Paul M Whitington, Georg Mayer
Mar 5, 2016·Proceedings of the National Academy of Sciences of the United States of America·Jie YangXi-Guang Zhang
Jul 22, 2014·Nature·Peiyun CongNicholas J Strausfeld
Aug 8, 2013·Journal of Morphology·Ivo de Sena Oliveira, Georg Mayer
Jun 11, 2017·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Christine MartinGeorg Mayer
Sep 19, 2018·Royal Society Open Science·Derek J SiveterDavid Legg

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