. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 434 A. R. HOLYOAK. Tu Th. Figure 2. Fully developed oozooid of Polyclinwn plenum as viewed through the slide to which it is attached (A—abdomen; P—post-abdomen; H—heart; Th—thorax; TV—test vessel; Tu—tunic). Tuberculate region at the top is the surface of the tunic around the oozooid's oral and cloacal apertures. 180 n 160 - 140 - 120 - 100 - 80 - 60 - 40 52 27 10 tt Strobilae produced Figure 3. Mean post-abdomen lengths for groups of zooids producing 1 (n = 52 zooids), 2 (n = 27). 3 (n = 10), or 4 (n = 3) post-abdominal str
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 434 A. R. HOLYOAK. Tu Th. Figure 2. Fully developed oozooid of Polyclinwn plenum as viewed through the slide to which it is attached (A—abdomen; P—post-abdomen; H—heart; Th—thorax; TV—test vessel; Tu—tunic). Tuberculate region at the top is the surface of the tunic around the oozooid's oral and cloacal apertures. 180 n 160 - 140 - 120 - 100 - 80 - 60 - 40 52 27 10 tt Strobilae produced Figure 3. Mean post-abdomen lengths for groups of zooids producing 1 (n = 52 zooids), 2 (n = 27). 3 (n = 10), or 4 (n = 3) post-abdominal strobilae. Error bars are standard deviations. A Tukey multiple com- parisons test revealed significant differences between post-abdomen lengths of zooids producing 1, 2, and 3 strobilae, but not between those producing 3 or 4 strobilae, as indicated by the Tukey-bar on the figure. bulge was the new developing thorax. At the same time, a smaller clear area—the heart—appeared at the end of the strobila opposite that of the new thorax. At this point, a strobila consisted of a post-abdomen and a thorax. Fi- giving rise to three strobilae and those giving rise to four may be attributed to the small number of zooids (n = 3) that produced four post-abdominal strobilae. Although the number of strobilae produced was a function of post- abdomen length, the timing of strobilation was not (Fig. 4). Post-abdominal strobilae were pinched off sequentially, beginning "; at the end formerly next to the abdomen, and proceeding "distally" toward the end far- thest from the abdomen (Fig. 5). Post-abdominal strobilae regenerated into whole blas- to/ooids, while the thoracic and abdominal remnants re- i ompletely (Fig. 6). These regressing elements be- came ular, possibly supplying nutrients to the regen- eratim rdings revealed the pattern of de- velopment in tti .mating strobilae. First, the strobilae produced a clear < e at the end of the strobila fo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
