Figure 4 in Recycling resources: silica of diatom frustules as a source for spicule building in Antarctic siliceous demosponges

Figure 4. Diatoms (di) ingested by amoeboid sponge cells (spc). A–D, sponge cells (spc) digesting diatoms (di) in P. areolatus. Note the large lipid (li) droplets present within diatoms (di) and later accumulated in the cytoplasm of sponge cells (spc). E–F, sponge cells (spc) digesting diatoms (di) in K. variolosa. Note the silica-like (si) granules being dissolved from the diatom frustule and the well-developed Golgi apparatus (g).