FIGURE 4. Mactra fuegiensis, A in Revision of the Magellanic Mactridae Lamarck, 1809 (Bivalvia: Heterodonta)

FIGURE 4. Mactra fuegiensis, A: SEM picture of the outer labial palp (olp), external view smooth and internal view plicate, scale bar = 2mm; B: SEM picture of the incurrent (in) and excurrent (ex) siphons, scale bar = 1 mm.