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Fig. 8 | BMC Evolutionary Biology

Fig. 8

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

Fig. 8

Comparison of ALNs and PLNs in WLG2 of the investigated pycnogonids. SLI signal shown in inverted b/w images for better contrast. One hemiganglion shown, the midline region is located towards the right. In order to reveal as many details of the neurites as possible, clipping planes have been applied to Imaris volumes. Images to the left (a-c) depict ganglion regions further ventral than corresponding images to the right (a’-c’). Red asterisks highlight ALN somata, red arrowheads illustrate the course of the primary neurite of one of the ALNs. Corresponding blue markings have been applied to the PLNs. Stars and black asterisks mark signal-free regions of elongate and ovoid glomerulus-like neuropils, respectively. a,a’: P. litorale. Note the high number of ALNs, the somata of which being spread out in a loose cluster-like array from ventral to dorsal. b,b’: Meridionale sp. The second PLN with comparable neurite course is not visible in the section shown in b. c,c’: C. japonicus

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BMC Ecology and Evolution

ISSN: 2730-7182

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