. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 BEER ET Figure 6. Representative drawings of 5HT and SI-Li IR neurons in the apical complex, andconfocal images of the apical ganglion showing selected rotations from a full 360° series. (A) to (C) show the serotonergic cells of the apical ganglion. (A) Diagram of the apical ganglion viewed from the anterior/ventral surface of the larva, as deduced from the three-dimensional rotations. Not to scale. (B) 0° rotation. (C) 65° rotation. (D) to (F) show the SALMFamidergic cells of the apical ganglion. (D) Diagram
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 BEER ET Figure 6. Representative drawings of 5HT and SI-Li IR neurons in the apical complex, andconfocal images of the apical ganglion showing selected rotations from a full 360° series. (A) to (C) show the serotonergic cells of the apical ganglion. (A) Diagram of the apical ganglion viewed from the anterior/ventral surface of the larva, as deduced from the three-dimensional rotations. Not to scale. (B) 0° rotation. (C) 65° rotation. (D) to (F) show the SALMFamidergic cells of the apical ganglion. (D) Diagram of the SALMFamidergic cells of the apical ganglion as deduced from three-dimensional rotations. Not to scale. The ganglion is bilaterally symmetrical, apparently with pairs of cells (arrows). (E) 0° rotation. (F) 50° rotation; indicates the nerve plexus. Bars = 25 to confirm unequivocally that the absence of immunoreac- tivity is due to the lack of antigen. This test still revealed positive labeling in several structures of the rudiment. The first appearance of SALMFamide-like immunoreac- tivity in the rudiment of the larvae was in the ectodennally derived lining of the vestibular cavity (Fig. 8A). Some SI-Li IR appeared in the covering of the primary podia, which is also ectodermal in origin. The earliest SI-Li IR in the circumoral and radial nerve cords was rather diffuse. In later specimens competent to metamorphose (the primary podia were observed to move independently), the immuno- reactivity was more concentrated, occurring in well-defined fiber tracts in the rays of the water vascular system, with the nerve ring in the tube feet clearly visible (Fig. 8B, C). No 5HT-Li IR was observed in the rudiment. Discussion The larval nen'ous system This study describes the neural development of Psammechi- nus miliaris, from the 4-armed pluteus stage through to a metamorphically competent larvae with 8 arms and a devel- oped adult rudiment. Most important, it extends the previou
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
