Figure 2 in Ultrastructure of the pseudocnidae of the palaeonemerteans Cephalothrix cf. rufifrons and Carinomella lactea and an assessment of their phylogenetic utility

Figure 2. Transmission electron micrographs of the middle proboscis of Cephalothrix cf. rufifrons. (A) Survey micrograph of a cross section of the middle proboscis. Asterisk (*) indicates a pseudocnida-forming cell. (B) Pseudocnida-forming cell revealing the nucleus, RER and several pseudocnidae. (C) Longitudinal section of pseudocnida. Arrow indicates the filament core. (D) Cross-section of a pseudocnida. Arrow indicates core. (E) Section of an everted proboscis. Apices of the pseudocnidae extend into the lumen. (F) Cross-sections of bases of pseudocnidae. Arrowheads indicate the lateral processes. Also note the sensory cilium of the adjacent sensory cell (sc). Abbreviations: cm, circular muscle; co, cortex; lm, longitudinal muscle; lp, lateral process; me, medulla; pe, proboscis peritoneum; pn, proboscis nerve; rd, fusiform rhabdoid; sc, sensory cell.