. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TUBE GROWTH IN CLONAL SERPULIDS. Figure 2. Asexual reproduction by posterior budding in Salmacina amphidentata. (A) Lateral view of an individual with developing bud fixed on the day that it built an escape hatch in the tube. Scale bar = 200 ( (B) Dorsal view of the developing bud. The bud's thoracic chaetae have not yet appeared. Note the rudimentary radicles and thoracic membranes. Scale bar = 250 bu = bud. ra = radioles. tm = thoracic membrane. nally adult abdominal chaetae in the first segment of the bud, and th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TUBE GROWTH IN CLONAL SERPULIDS. Figure 2. Asexual reproduction by posterior budding in Salmacina amphidentata. (A) Lateral view of an individual with developing bud fixed on the day that it built an escape hatch in the tube. Scale bar = 200 ( (B) Dorsal view of the developing bud. The bud's thoracic chaetae have not yet appeared. Note the rudimentary radicles and thoracic membranes. Scale bar = 250 bu = bud. ra = radioles. tm = thoracic membrane. nally adult abdominal chaetae in the first segment of the bud, and the sequential development (anterior to posterior) of three thoracic chaetigers from this segment. The first thoracic chaetiger bore only elongate chaetae dorsally. The next two thoracic chaetigers, which developed soon after the first, bore both dorsal elongate chaetae and ventral uncini. Posterior to these new thoracic chaetigers, the segments retained the abdominal configuration of chaetae present when the segments belonged to the adult (, uncini were dorsal). During this time, the gut of the bud remained continuous with that of the adult, and algal cells ingested by the adult passed through the developing bud. Though I did not follow the timing of early events of asexual reproduc- tion in detail, the period from the initial appearance of orange granules in the posterior of an adult to the stage illustrated in Figure 2 took no more than 4 days. At this stage in development—when the bud had formed eight radioles, the rudiments of the thoracic membrane, and from zero to three thoracic chaetigers—the parent worm altered its pattern of tube growth in a striking way. Instead of continuing to form a normal cylindrical tube, it built a small trumpet-shaped flare, or peristome, in the tube open- ing. Immediately distal to the peristome, the adult continued to form a cylindrical tube, but built into its uppermost surface a circular or ovoid hole of about the adult worm's diamet
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
