. The Biological bulletin. Biology; Zoology; Marine biology. SPONGE METAMORPHOSIS 169. Figure 11. An amoeboid cell with two minute ellipsoid granules (arrows) in the metamorph of Haliclona pennollis about 24 h after settlement. This cell has a nucleolus (NO) and phagosomes (P). Scale bar = /im. Figure 12. Amoeboid cells with minute ellipsoid granules (arrows) about 24 h after settlement. Nucleoli are not visible in these cells. N: nuclei, P: phagosome. Scale bar = ^m. from the flagellated cells were positioned within or close to the archeocytes. In Microciona prolifera, Misevic et al.
. The Biological bulletin. Biology; Zoology; Marine biology. SPONGE METAMORPHOSIS 169. Figure 11. An amoeboid cell with two minute ellipsoid granules (arrows) in the metamorph of Haliclona pennollis about 24 h after settlement. This cell has a nucleolus (NO) and phagosomes (P). Scale bar = /im. Figure 12. Amoeboid cells with minute ellipsoid granules (arrows) about 24 h after settlement. Nucleoli are not visible in these cells. N: nuclei, P: phagosome. Scale bar = ^m. from the flagellated cells were positioned within or close to the archeocytes. In Microciona prolifera, Misevic et al. (1990) labeled the flagellated cells of free-swimming larvae with '^^I. The label was found in the phagosomes of ar- cheocytes in the metamorphs, but not in the choanocytes of juveniles, leading the authors to conclude that all of the flagellated cells were phagocytosed by archeocytes during metamorphosis and did not give rise to choano- cytes. The origin of the choanocytes was, however, not shown because the label was not found in the phagosomes of choanocytes, which are thought to derive from archeo- cytes. Our conclusions in the present paper are not contrary to the concept that the archeocytes are multipotential and capable of differentiating into choanocytes. In cases where a supply of larval flagellated cells is not available, choano-. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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