It is flat, translucent, and has a large, disc-shaped haptor, a posterior organ used for semi-permanent attachment to the host.
[4] Entobdella soleae utilizes suction through a posterior disc-shaped haptor to achieve semi-permanent attachment to the sole's skin.
[5] A 4-5 μm layer of cement bonds the adhesive pad of E. soleae via tegumental microvilli and the sole's epidermal furrows during attachment.
The locomotion step of E. soleae on the skin sole starts through elongation of the body with the haptor attached.
[7] During migration, E. soleae larva utilizes the physical features of the host's scales as guidance for movement towards the head.
The opercular bond is strong, and operculum detachment only occurs through the actions of oncomiracidium and the secretion of hatching fluid by glands from the head region.
[8] The eggshell of E. soleae has a similar structural appearance to those of Fasciola hepatica, but without a membrane on the egg-shell lining.
[8] Egg hatching of E. soleae induces a releaser response where the larva swims up and down the water column in the ocean to find the sole host.
When fully developed eggs are in contact with sole body mucus during the illumination cycle, hatching is enhanced.