3D reconstruction of H. psammobionta (ZSM Mol-19992019/2) showing organization of major organ systems. Anterior to the right. A: Right view of complete, moderately contracted specimen. B: Kidney of same specimen, dorsal view. C: Reproductive system. Scale bars: A, 100 μm; B, 25 μm; C, 50 μm. Abbreviations: ag, accessory ganglia; agl, caudal adhesive gland; am, ampulla; an, anus; apg, anterior pedal glands; bb, buccal bulb; cpg, cerebropleural ganglion; dg, digestive gland; ey, eye; fg1-5, female glands (proximal to distal); fz, presumed filter zone; gd, (undifferentiated) gonoduct; go, gonad; gp, genital pore; it, intestine; kd, kidney; mo, mouth opening; np, nephropore; oc, oocytes; pg, pedal ganglia; sgl, salivary gland; tg, ‘terminal’ gland; vg, visceral ganglion; vn, visceral nerves.