Fig. 1From: Assessing segmental versus non-segmental features in the ventral nervous system of onychophorans (velvet worms)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)Back to article page