Fig. 3.

Comparisons of interstitial cells and amoebocytes in various cnidarians. a–c I-cells from hydrozoans; note the simple, rounded morphology and lack of organelles (excluding mitochondria). a Hydra (from Lentz 1965). b Halocordyle (from Martin 1988). c Clytia (from Denker et al. 2008). d–g Amoebocytes from non-hydrozoans; note the extreme variation of shapes, filopodial extensions, and abundance of granules. d Anthozoan sea anemones Actinia (from Larkman 1984b) and e–f Nematostella (from Tucker et al. 2011). g Scyphozoan jellyfish Aurelia (from Chapman 1999, arrows added for clarity)