Figure 4. Terebellides longicaudatus Hessle, 1917. SEM micrographs from syntype SMNH 6636 in Revision of three species of Terebellides (Polychaeta: Trichobranchidae) described by C. Hessle in 1917 from the Southern Ocean

Figure 4. Terebellides longicaudatus Hessle, 1917. SEM micrographs from syntype SMNH 6636. (A) Anterior end, lateral view showing pointed projection of lobe ii (encircled) and position of dorsal papilla on chaetiger 3 (arrow); (B) Geniculate acicular hooks, 6th thoracic chaetiger; (C) Textured surface of thoracic notochaetae; (D) Thoracic unciniger, chaetiger 12; (E) Thoracic uncini, upper view; (F) Body constriction between abdominal chaetigers 17 and 18 (arrow); (G) Abdominal chaetigers 12 to 14, dorsal view showing dorsal papillae (arrow); (H) Abdominal uncini; upper view.