FIGURE 4 in Morphological and molecular diversity of rissoellids (Mollusca, Gastropoda, Heterobranchia) from the Northwest Pacific island of Hokkaido, Japan

FIGURE 4. SEM micrographs of Rissoella elatior. (A) Apertural view of the shell. (B) Apical view of the protoconch. (C) Detail of the protoconch showing the suture. (D) Inner face view of the operculum. (E) Radula. (F) Central teeth. (G) Lateral teeth. (H) Inner and outer marginal teeth.