. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 286 S. G. WEBSTER GSPN. Figure 3. Camera lucida tracing of the ventral ganglion of Chirana hameri, detailing the gross structure of the large ventral PDH-immuno- positive perikarya, and more detailed structures of the two groups (weakly immunoreactive) of three dorsal perikarya. The posterior cells direct axons ipsiluterally, whilst the anterior cells project axons ipsi- and contralaterally. Scale bar = 500 /j. Abbreviations as in Fig. 2. were observed (Fig. If), and a further six pairs of very weakly immunoreactive perikary
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 286 S. G. WEBSTER GSPN. Figure 3. Camera lucida tracing of the ventral ganglion of Chirana hameri, detailing the gross structure of the large ventral PDH-immuno- positive perikarya, and more detailed structures of the two groups (weakly immunoreactive) of three dorsal perikarya. The posterior cells direct axons ipsiluterally, whilst the anterior cells project axons ipsi- and contralaterally. Scale bar = 500 /j. Abbreviations as in Fig. 2. were observed (Fig. If), and a further six pairs of very weakly immunoreactive perikarya were located centrally (Fig. Id, f). Apart from the above-mentioned structures, the only PDH-immunoreactive structures consistently seen were in the supra-esophageal ganglia of B. balanus, where at least two pairs of strongly immunoreactive and three pairs of weakly immunoreactive neurons were seen, asso- ciated with extensive dendritic fields with prominent vari- cosities on the surface and within the neuropil (Fig. la, b). Several contralaterally projecting tine axons were also observed (Fig. Ib). Occasionally, prominent beaded axons originating from the supra-esophageal ganglion were seen in the circumesophageal connectives (Fig. Ig), but these could never be traced to the ventral ganglion (Fig. le). CCAP-immunoreactive neurons CCAP-immunoreactivity was observed in all species of barnacles examined, although immunoreactivity was weak, and background staining was high, even when ner- vous systems were fixed in carbodiimide fixative (the fixative of choice for this peptide in whole mounts of arthropod nervous tissue (Dircksen ct ai. 1991). For both B. balanus and C. hameri, similar morphologies of CCAP-immunoreactive neurons were observed (Fig. 1,1 - n). The anterior pair of perikarya (ca. 50 p diam.) are dorsal, the posterior two pairs (ca. 30 fj, diam.) are ventral. All perikarya project a single axon contralaterally which descends to the posterior margin of the ventral ga
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
