. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. AXIS > AXIS. •« AXIS > . GVC. AXIS »• Figure 5. (Continued) tion of a series of interacting six-radiates. Chain links have an extended smooth surface (smooth portion of the arms) on which interlocking links can slide, but which are ter- minated abruptly by the terminal cross piece (tubercles). Compression of the colony surface causes the smooth rays to slide along each other until the tubercles come into contact. When all radiates are compressed to the extent that they can no longer slide with respect to each other, th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. AXIS > AXIS. •« AXIS > . GVC. AXIS »• Figure 5. (Continued) tion of a series of interacting six-radiates. Chain links have an extended smooth surface (smooth portion of the arms) on which interlocking links can slide, but which are ter- minated abruptly by the terminal cross piece (tubercles). Compression of the colony surface causes the smooth rays to slide along each other until the tubercles come into contact. When all radiates are compressed to the extent that they can no longer slide with respect to each other, the surface becomes rigid. Extension pulls the radiates apart along the smooth ray axes until terminal tubercles come in contact with the adjacent sclerite tubercles. This limits further extension of the coenenchyme. Possible function of unilaterally spinose spindles (Fig. 5) Compression or extension results in a change in angle of tufts relative to the colony axis with tufts closer to par- allel with the colony on extension and more perpendicular to the colony on compression. A possible explanation for these results involves the interaction of the middle cortex spindles, mesogleal gel, and the gastrovascular system of the colony. The feeding polyps are located in the crevice between the calycal trough and the colony body. In a neu- tral state, the tufts extend out from the colony surface at an angle of approximately 40°, which allows the polyp tentacles to be extended from the crevice for food capture. Compression of the layer of mesogleal gel is translated into a lateral force that pushes the spindles away from the colony surface. Additionally, compression of the gastro- dermal tubes that link the polyp cavities increases the internal pressure and forces water out into the only pos- sible exit—the polyp cavities. Because the gastrodermal tubes are linked directly to the polyp gastrocoel, expulsion of water inflates the polyp bodies. Inflation of the polyps results in a
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
