Figure 2.

Sea urchin coelomocytes. Coelomocytes from the green sea urchin, Strongylocentrotus droebachiensis, were settled onto a glass coverslip and imaged live. Cell types that are typical of echinoids include discoidal phagocytes (1), polygonal phagocytes (2), red spherule cells (3), colorless spherule cells (4), vibratile cells (5; the lower cell has lost the prominent flagellum that is present in the upper cell), and small phagocytes (6, inset). Bar = 10 μm. This is Figure 2 from Smith et al. (2010), reproduced with permission from Landes Bioscience and Springer Science + Business Media.