Figure 3 in Redescription of Lineus acutifrons Southern, 1913 (Nemertea: Pilidiophora) and comments on its phylogenetic position

Figure 3. Lineus acutifrons. (A) Transverse section showing the body wall; (B) transverse section at intestinal region; (C) transverse section at foregut; (D) transverse section at foregut showing the anterior portion of the proboscis; (E) transverse section at main portion of the proboscis; (F) longitudinal section through the brain showing gregarine parasites (arrows). Scale bars A–F: 100 µm. Abbreviations: CM, circular muscle layer; cso, cerebral sensory organ; d, dermis; dg, dorsal ganglia; dvm, dorsoventral musculature; ep, epidermis; fep, foregut epithelium; id, intestinal diverticula; ILM, inner longitudinal muscle layer; ll, lateral lacunae; ln, lateral nerve cord; mp, muscle plate; np, proboscidial neural plexus; OLM, outer longitudinal muscle layer; p, proboscis; pep, proboscidial epithelium; pICM, proboscidial inner circular muscle layer; pLF, proboscidial longitudinal fibres; pn, proboscidial nerves; pOLM proboscidial outer longitudinal muscle layer; r, rhynchocoel; v, villus; vg, ventral ganglia.