. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S. AMANO AND I. HORI. Figure 2. The pseudostratitied layer of flagellated cells in the coeloblastula of Leucosolenia laxu. F: fibrous granule in the outermost cytoplasm, G: glutinous granule in the apical cytoplasm, P: phagosome-like granule in the basal cytoplasm. Scale bar = 2 /nm. lacks a basal lamina. One flagellum emerges from the outer surface of the cell. There are glutinous granules in the apical cytoplasm and fibrous granules in the outermost cytoplasm. An elongated nucleus, about 5x2 /urn, has a nucleolus and heter
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. S. AMANO AND I. HORI. Figure 2. The pseudostratitied layer of flagellated cells in the coeloblastula of Leucosolenia laxu. F: fibrous granule in the outermost cytoplasm, G: glutinous granule in the apical cytoplasm, P: phagosome-like granule in the basal cytoplasm. Scale bar = 2 /nm. lacks a basal lamina. One flagellum emerges from the outer surface of the cell. There are glutinous granules in the apical cytoplasm and fibrous granules in the outermost cytoplasm. An elongated nucleus, about 5x2 /urn, has a nucleolus and heterochromatin masses. The basal cytoplasm contains pha- gosome-like granules, and the innermost region of the cell is filled with many small (about /Ltm) vesicles and a few lipid droplets (Fig. 3). There are mitochondria in both the apical cytoplasm and the basal cytoplasm. Figures 4 and 5 show magnified images of the apical region of flagellated cells. It is apparent that one flagellum emerges from the flat outer surface of the cell. The most proximal portion of the flagellum is somewhat electron- dense. From a basal body, two rootlets extend downward to the sides of a nucleus. The rootlets are striated, with a distance of about 40 nm between the midpoints of two neighboring striae. There is a basal foot running parallel to the outer surface. The Golgi apparatus is always located vertically along the rootlet. Only in the apical region are the neighboring flagellated cells united, by simple apposition (Figs. 4 and 5); in the deeper region, there is a wide space between the cells (Fig. 2). We found a consistent arrangement and orientation in the apical region of larval flagellated cells. One side of the outermost portion of the cell protrudes toward a neighbor cell, and the protrusion is regularly directed to the anterior end of the larva (Figs. 4 and 5). A basal foot consistently extends in the opposite direction—that is, to the posterior. Please note that these images are
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
