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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: Serotonin-immunoreactivity in the ventral nerve cord of Pycnogonida – support for individually identifiable neurons as ancestral feature of the arthropod nervous system

Fig. 1

Investigated pycnogonid species and gross morphology of the VNC with SLI overview. a: Pycnogonum litorale, dorsal view of copulating couple with male clinging to the back of the female. b: Meridionale sp., anterior view (Original: Claudia Arango). c: Cilunculus japonicus, dorsal view of fixed specimen. d-f: Dissected VNCs of the investigated species in dorsal view, giving an overview of the general SLI pattern. SLI shown in inverted b/w images for better contrast. Arrowheads mark the conspicuous DMN somata in the walking leg ganglia. d: P. litorale. Note that walking leg neuromere 1 is fused with the palpal and ovigeral neuromeres in an extended subesophageal ganglion. e: Meridionale sp. Note weaker labeling of the ganglionic neuropil, which is additionally obscured by strong unspecific labeling of the surrounding neural sheath (compare Fig. 4b). f: C. japonicus. The overview has been composed of two separate images (dashed horizontal line)

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