Figure 7. Microscopic anatomy of Prosadenoporus species. (A–C) A series of transverse sections through the frontal organ of Prosadenoporus enalios comb. nov.; relative position of the lateral acidophilic regions (arrowheads) indicate a noticeable twist of the frontal organ canal; (D) a longitudinal sagittal section through frontal organ of Prosadenoporus mooreae comb. nov. (anterior to the right); (E–I) a series of slightly oblique transverse sections through the frontal organ of P. mooreae comb. nov.; lateral acidophilic regions of the frontal organ (arrowheads), note the twisting of the frontal organ canal; (J) transverse section through lateral nerve cord of Prosadenoporus winsori comb. nov. showing the tentative neurochord (arrowhead); (K) binucleate terminal cells of nephridia (flame cells) of P. winsori comb. nov. (arrowheads); (L) a longitudinal sagittal section through the frontal organ of P. winsori comb. nov. (anterior to the left). Notes: bgl, basophilic cephalic glands; cg, cerebral ganglia; fo, frontal organ; lnc, lateral nerve cord; rhd, rhynchodeum. Scales: (A–C), and (E–I), 50 mm; (D), 100 mm; (J), 30 mm; (K), 20 mm; (L), 200 mm.