Figure 7 in Reconstructing the Anomalodesmata (Mollusca: Bivalvia): morphology and molecules

Figure 7. Key characters mapped on Maximum Likelihood tree topology constrained for monophyletic septibranchs in Figure 6. Filled diamonds indicate nonhomoplastic character state transitions, open diamonds indicate convergent changes or reversals [homoplastic changes]. Characters: 1, homogeneous shell microstructures, 0 – absent, 1 – fine crystals (<1 µm in diameter), 2 – coarse crystals (> 5 µm); 2, spicules, 0 – absent, 1 – present on juvenile shell only, 2 – present on adult shell; 3, chondrophores, 0 – absent, 1 – present; 4, lithodesma, 0 – absent, 1 – present in anterior position, 2 – present in more ventral position, 3 – only present in juvenile; 5, fourth pallial aperture, 0 – absent, 1 – present; 6, arenophilic glands, 0 – absent, 1 – present; 7, septum, 0 – absent, 1 – thin, 2 – muscular; 8, stomach type of Purchon (1987a), 0 – type IV, 1 – type II, 2 – type V.