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. 2017 Jan 3;17:3. doi: 10.1186/s12862-016-0853-3

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — General anatomy and organisation of the central nervous system in Onychophora. Walking specimens of Principapillatus hitoyensis (a) and Euperipatoides rowelli (b). c Simplified diagram showing the entire onychophoran central nervous system with the brain situated within the head and the two ventral nerve cords located in the trunk. d Dissected single nerve cord from a specimen of P. hitoyensis. Anterior is up. Note the slight swelling in each leg-bearing region (dotted brackets). an, antenna; at, antennal tract; br, brain; le, leg; ln, leg nerve; nc, nerve cord; mc, median commissure; rc, ring commissure; sp, position of slime papilla. Scale bar: 50 μm (d)