Figure 19 in Morphological perspective on the classification and evolution of Recent Pterioidea (Mollusca: Bivalvia)

Figure 19. Abdominal sense organ in the Pterioidea. A, histological cross-section of the abdominal sense organ in the sagittal plane (7 µm, Alcian Blue/Periodic Acid/Schiff's trichrome stain), Pinctada longisquamosa (AMNH 298904, 18.1 mm); diagrammatic posterior view of the adductor muscle showing the arrangement of the abdominal sense organs in the Pterioidea: B, Crenatula, Electroma, Pinctada, Vulsella; C, most Pteria; D, Malleus; E, most Isognomon. Abbreviations: am (posterior) adductor muscle; an, anus; aso, abdominal sense organ; in, intestine; n, nerve; se, sensory epithelium; vg, visceral ganglia. Scale bar = 0.05 mm.