Figure 10
From: Posterior regeneration in Isodiametra pulchra (Acoela, Acoelomorpha)
Specimens after regenerating for nine days. Anterior is to the lower left corner in A and to the left in B and C. A. Horizontal CLSM projection through central part of copulatory organs. B. Sagittal histological section through copulatory organs. Note the sperm in the seminal bursa and the digestive syncytium, showing that the specimen has copulated. Black arrows point to dorsal and ventral part of the female sphincter, arrowheads to distal portions of prostatoid gland cells within the seminal vesicle. C. Sagittal histological section through female copulatory organ. Abbreviations: ae, antrum epithelium; bn, bursal nozzle; bs, bursal stalk; cv, chordoid vacuole; ds, digestive syncytium; p, penis; pg, prostatoid gland cells; sb, seminal bursa; sp, sperm; sph, female sphincter; sv, seminal vesicle; v, vagina; ve, vestibulum. Scale bars: A, B 50 μm; C 20 μm.