Figure 5
Semithin sections showing histological aspects of the posterior half of the body of H. psammobionta. A: Longitudinal section of reproductive system showing female glands. Anterior at right. B: Cross-section close to genital opening (grey arrow) and terminal gland. C: Yolky oocyte, nucleus indicated by asterisk. Dorsal at right. D: Kidney. Dorsal at left. E: Filter zone of kidney, sectioned longitudinally. Asterisk highlights nucleus of filter cell, arrowheads mark thin parts of wall. Dorsal at left. F: Cross-section through filter zone. G: Tail end showing ciliated openings of caudal adhesive gland (note emerging blue ‘pegs’, arrowheads). Scale bars: A-D, 50 μm; E-F, 10 μm; G, 25 μm. Abbreviations: agl, nuclei of adhesive gland cells; am, ampulla; dg, digestive gland; fg1-fg4, nidamental glands (proximal to distal); kd, kidney; oc, oocyte; tg, ‘terminal’ gland; vn, visceral nerve.