SEM Images. 23–25 (first column), Owenia caissara sp. n. from Babitonga Bay, Polychaeta 17517, 17518. 26–28 (second column), Owenia caissara sp. n. from Paranaguá Bay, Polychaeta 17523. 23 and 26, apical view of hooks on the first abdominal segment; 24 and 27, frontal view of hooks on the first abdominal segment; 25 and 28, median portion of notocheata from first abdominal segment, showing scales. Scale bars: 2 µm (23), 5 µm (24), 2 µm (26, 28), 4 µm (25), 1 µm (27).