Figure 4. a in The gill morphology of the date mussel Lithophaga lithophaga (Bivalvia: Mytilidae)

Figure 4. a. Inner sides of the food grooves of the filaments in L. lithophaga with a thick ciliary head and fan-shaped ciliary connection of the lamellae (arrows). b. Filaments attached by continual ciliary junctions (cj). c. Discs formed by condensed tufts of simple cilia. Scale bar: a = 60 µm, b = 20 µm, c = 6 µm.