Fig. 4 Xenoskenea pellucida. a, b in Interactive 3D anatomy and affinities of the Hyalogyrinidae, basal Heterobranchia (Gastropoda) with a rhipidoglossate radula

Fig. 4 Xenoskenea pellucida. a, b Reconstruction of genital system; (a) right side view, body wall transparent, vertical lines at bottom indicate section planes c–e, arrowhead points to male genital opening; (b) left side view, body wall omitted. (c) Cross section of anterior vas deferens and penis (longitudinally sectioned) flanked by pallial lobe; arrowhead points to distalmost vas deferens within copulatory organ. (d) Detail of thickened part of vas deferens with large nuclei. (e) Detail of egg in cross section. Labels: bs1/2 = blind sac 1/2, ct = right cephalic tentacle, e = eye, g = gonad, hc = heterochromatine, hd = hermaphroditic duct, n = nucleus, nl = nucleolus, od = oviduct, pe = penis, pl = pallial lobe, sg = spermato- gonia, vd = vas deferens, y = yolk mass