Figures 36–37 in Sanitation with sponge and plunger: western Atlantic slit-wormsnails (Mollusca: Caenogastropoda: Siliquariidae)

Figures 36–37. Tenagodus modestus, external softbody anatomy, from preserved specimen (Florida Keys, FMNH 296715). 36: overall morphology; ctenidial filaments reflected out of naturally slitted mantle cavity to expose food groove; note greatly reduced cephalic and pedal region compared to rest of body. 37: oblique lateral aspect of head-foot region, mantle reflected along naturally occurring slit; note short looped osphradium, glandular pad, absence of rectum, and weak mantle papillae on inner mantle margin. Scale bars = 2 mm. Abbreviations: an, anus; com, columellar muscle; ct, ctenidium; dg, digestive gland; en, endostyle; ey, eye on outer base of tentacle; fg, food groove; ft, foot; mep, mantle edge papillae; ms, mantle slit; op, operculum; os, osphradium; ov, ovipositor.