Figure 3. a in The gill morphology of the date mussel Lithophaga lithophaga (Bivalvia: Mytilidae)

Figure 3. a. Frontal and abfrontal (arrow) views of the demibranches of L. lithophaga. b. Canal formation and food grooves are very prominent at the ventral end of the filaments. Leveled connective discs occur at regular intervals along the filaments; cj: ciliary junction. c. Enlarged free end with marginal groove (mg) and duct (d) on the surface. Scale bar: a = 200 µm, b = 100 µm, c = 40 µm.