FIGURE 4 in Three new species of Glossobalanus (Hemichordata: Enteropneusta: Ptychoderidae) from western North America

FIGURE 4. Light micrographs of transverse sections of Glossobalanus barnharti. A, Proboscis with massive radial muscle bundles. B, Proboscis heart-kidney complex with lateral and dorsal glomerulus. C, Peduncle showing the large lumen of the stomochord. D, Peduncle with deep and narrow keel. E, Collar. F, Collar cord with dorsal nerve roots. G, Anterior pharynx large dorsal branchial lumen. H, Intestinal region with lateral septum and median gonads. Abbreviations: bv, blood vessel; cc, collar canal; cl, collar lumen; clm, collar longitudinal muscles; cv, cardiac vesicle; ds, dorsal septum; ep, epidermis g, glomerulus; gb, gill bar; mg, median gonad; lg, lateral gonad; ls, lateral septum; mg, median gonad; nc, nerve cord; nr, nerve roots; pbd, peribuccal diverticula; pc, proboscis coelom; phd, perihaemal diverticula; pl, pharynx lumen; plm, proboscis longitudinal muscles; s, stomochord; sk, skeletal keel; tc, trunk coelom; vp, vascular plexus. Scale bars: A, E, F, G, H = 500 µm; B, C = 200 µm; (D) = 250 µm.