Figure 9. (A–B) Transverse sections through the frontal organ of Pantinonemertes californiensis; (C–I) Prosadenoporus spectaculum comb. nov.: (C–F) a series of transverse sections through the tip of the head showing frontal organ twisting; lateral acidophilic regions of the frontal organ marked with arrowheads; (G) transverse section through the cerebral ganglia showing two neurochord cells (circled, insert); (H) transverse section through the proboscis insertion and anterior portion of cerebral ganglia showing contracted proboscis insertion muscles; (I) transverse section through the posterior region of brain showing beginning of the lateral nerve cords (asterisks) which appear sectioned longitudinally, presumably because of the severe contraction of the specimen during fixation. Notes: bgl, basophilic cephalic glands; cg, cerebral ganglia; fo, frontal organ; ogl, orange-G cephalic glands; vc, ventral brain commissure. Scales: (A–F), 50 mm; (G), 100 mm (insert, 50 mm); (H–I), 200 mm.

Published as part of Maslakova, Svetlana A. & Norenburg, Jon L., 2008, Revision of the smiling worms, genera Prosadenoporus Bürger, 1890 and Pantinonemertes Moore and Gibson, 1981 and description of a new species Prosadenoporus floridensis sp. nov. (Prosorhochmidae; Hoplonemertea; Nemertea) from Florida and Belize, pp. 1689-1727 in Journal of Natural History 42 (25-26) on page 1718, DOI: 10.1080/00222930802130286, http://zenodo.org/record/4590381