Live observations of Monocelis sp. (A) Overview of a live animal with fused pigmented eyespots, statocyst, testes, pharynx and copulatory organs. The inset shows the seminal vesicle and the stylet. (B-F) Posterior regenerates with regenerating pharynx and tail at different time points. (B) One-day-old regenerate showing an unpigmented area, the pharynx primordium (pp). The white arrow indicates the formation of the pharyngeal sheath. The wound is already closed. (C) Two-day-old posterior regenerate with a spherical immature pharynx and first signs of regeneration of the duo-gland adhesive systems (black arrowheads). (D) Three-day-old posterior regenerate with elongated, fully functional pharynx and additional duo-gland adhesive systems (black arrowhead). (E, F) 9-day-old posterior regenerate showing a fully regrown pharynx and seminal vesicle and stylet. (G) 14-day-old anterior regenerate with its original pharynx and no sign of any ongoing regeneration process. ph, pharynx; pp, pharynx primordium; sty, stylet; sv, seminal vesicle. Scale bars, 100 μm; inset, 25 μm. All images with anterior to the left.