Figure 16 in Morphological perspective on the classification and evolution of Recent Pterioidea (Mollusca: Bivalvia)

Figure 16. Anatomy of pterioidean stomach. A diagrammatic lateral view through the right stomach wall showing differences in the morphology of the fleshy fold, the course of the tongue of the major typhlosole, and its association with the ducts of digestive diverticula. A, most Pterioidea; B, Isognomon, Pulvinites, some Malleus spp. Abbreviations: cs, crystalline style; ddd, ducts of digestive diverticula; ff, fleshy fold; fff, finger-like processes of fleshy fold; gs, gastric shield; in, intestine (co-joined with style sac); oe, oesophagus; pw, partition wall; td, tongue of major typhlosole diving into digestive diverticula; ty, major typhlosole; tty, tongue of major typhlosole.