Figure 4
From: Development to metamorphosis of the nemertean pilidium larva
Advanced stages of juvenile development inside pilidium of Micrura alaskensis. DIC images. Lateral views. Apical plate up, juvenile anterior left. A. Complete proboscis stage is characterized by proboscis (pb) reaching the stomach (st). B. Hood stage is characterized by the anterior margin of the juvenile dorsal epidermis overlapping the proboscis (arrowhead). C. A complete juvenile inside the pilidium larva. At this stage the larva is competent to undergo metamorphosis.