. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HEMICHORDATE FEEDING 419 tacle. Prominent lateral cilia. 10-13 urn in length, make up two of the ciliated bands (Fig. 2a). My findings con- firm Nielsen's (1987) report that these hands are com- posed of two rows of monociliated cells. Two additional rows of single cilia are present in the frontolateral po- sition of the tentacles (Fig. 2b). These cilia are slightly shorter, about 8-10 nm. Finally some sparse frontal cilia (8-10 ^m) are also present. There are no ciliated tracts on the abfrontal surface of the tentacle. All
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HEMICHORDATE FEEDING 419 tacle. Prominent lateral cilia. 10-13 urn in length, make up two of the ciliated bands (Fig. 2a). My findings con- firm Nielsen's (1987) report that these hands are com- posed of two rows of monociliated cells. Two additional rows of single cilia are present in the frontolateral po- sition of the tentacles (Fig. 2b). These cilia are slightly shorter, about 8-10 nm. Finally some sparse frontal cilia (8-10 ^m) are also present. There are no ciliated tracts on the abfrontal surface of the tentacle. All three types of ciliated bands are represented in Figure 2c. which is a TEM of a tentacle in cross-section. Microvilli com- pletely cover the tentacle as well as the frontal surface of the arm (Fig. 2d). My findings corroborate those of Gilmour (1979) in R. compacta and Dilly el al. (1986) in Cephalodiscus graci/i*. The frontal surface of the arms is densely ciliated throughout its length (Fig. 3a). 1 was not able to discern whether these cilia formed one large ciliated. M Figure 2. dilation patterns on the tentacle and arm of Rhuliclnplciiru nornnini (A) SEM of tentacle in frontal view reveals the ciliary- pattern (scale bar = 10 Mm). (B) SEM of tentacle in lateral view (scale bar = 10 /im)(C)TEM of tentacle in cross section (scale bar = 10 urn). A frontal and a right frontolateral cilium are shown, but the corresponding left frontolateral cilium is not. (D) TEM of the arm in cross section showing the frontal surface. Note the numerous microvilli (scale bar = 1 ^m). C—cilium. F—frontal cilia. FL— frontolateral cilia. L—lateral cilia. M— Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). An
Size: 1504px × 1662px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
