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FIGURE 15 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 15. Aphanostoma collinae sp. nov.; photomicrographs of sagittal histological sections of holotype. A. Whole animal. B, C. Copulatory organs. Arrowheads point to spots of concentrated actin in wall of seminal bursa.

FIGURE 6 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 6. Daku riegeri sp. nov.; photomicrographs of whole-mounts stained with Alexa-488-labeled phalloidin and viewed with confocal microscopy. A. Projection of seminal vesicle and antrum musculature. B, C. Optical sections of copulatory organ musculature. Arrowheads point to actin-rich bodies within seminal bursa.

FIGURE 9 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 9. Exocelis reedi sp. nov.; photomicrographs of sagittal histological sections. A. Whole specimen. B. Female copulatory organs. C. Male and female copulatory organs.

FIGURE 5 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 5. Daku riegeri sp. nov.; photomicrographs of sagittal histological sections of holotype. A. Whole animal. B– D. Copulatory organs.

FIGURE 3 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 3. Daku riegeri sp. nov.; photomicrographs of living specimens. A. Whole animal. B. Male and female copulatory organs.

FIGURE 28 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 28. Praeaphanostoma foramivora sp. nov.; photomicrographs of histological sections. A. Median sagittal section through whole animal. B. Sagittal section through copulatory organs.

FIGURE 24 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 24. Isodiametra nicki sp. nov.; photomicrographs of a living specimen. A. Longitudinal rows of rhabdoid glands. B. Arrangement of organs.

FIGURE 1 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 1. Photomicrographs of living specimens. A. Childia crassum. B. Male copulatory organ of Childia crassum. C. Childia groenlandica.

FIGURE 18 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 18. Diatomovora jacki sp. nov.; photomicrographs of sagittal histological sections of holotype. A. Whole animal. B, C. Copulatory organs. Arrowheads point to bursal nozzles in bursal cap of seminal bursa.

FIGURE 31 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 31. Praeconvoluta bocasensis sp. nov.; photomicrographs of sagittal histological sections of holotype. A. Median sagittal section through whole animal. B. Sagittal section through copulatory organs. Arrowhead points to location of common gonopore.

FIGURE 32 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 32. Praeconvoluta bocasensis sp. nov.; photomicrographs of copulatory organs in whole-mount stained with Alexa-488-labeled phalloidin and viewed with confocal microscopy. A. Optical section through male copulatory organ and seminal bursa. B. Projection of male copulatory organ and seminal bursa.

FIGURE 27 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 27. Praeaphanostoma foramivora sp. nov.; photomicrographs of a living specimen. A. Whole specimen. B. Copulatory organs.

FIGURE 4 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 4. Daku riegeri sp. nov.; photomicrographs of living specimens. A. Ventral view showing gonopore and male copulatory organ. B. Ventral view showing copulatory organs.

FIGURE 33 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 33. Antrosagittifera corallina; photomicrographs of living specimen. A. Dorsal view of lightly squeezed specimen. B. Posterior end of animal, showing copulatory organs and sagittocysts.

FIGURE 23 in Acoela (Acoelomorpha) from Bocas del Toro, Panama

FIGURE 23. Isodiametra cuernos sp. nov.; reconstruction showing arrangement of copulatory organs in median sagittal plane.

FIGURE 9. Pseudaphanostoma hyalinorhabdoida n in Four new species of Acoela from Chile

FIGURE 9. Pseudaphanostoma hyalinorhabdoida n. sp. Photomicrographs of living specimens A–B. A. Dorsal view of whole specimen. Scale bar: 100 µm. B. Internal anatomy of posterior end showing the male copulatory organ, ovaries and testes. Scale bar: 50 µm.

FIGURE 13. Solenofilomorpha pellucida n in Four new species of Acoela from Chile

FIGURE 13. Solenofilomorpha pellucida n. sp. Photomicrographs of living specimens A–C. A. Dorsal view of whole specimen. Scale bar: 200 µm. B. Internal anatomy of whole specimen. Scale bar: 100 µm. C. Lateral view of anterior end showing the mouth and the ciliated pharynx. Scale bar: 100 Μm.

FIGURE 5. Postaphanostoma nilssoni n in Four new species of Acoela from Chile

FIGURE 5. Postaphanostoma nilssoni n. sp. Photomicrographs of living specimens A–C. A. Dorsal view of whole specimen. Scale bar: 200 µm. B. Anterior end showing the frontal gland pore and distribution of frontal glands. Scale bar: 100 µm. C. Internal anatomy of posterior end showing the male copulatory organ and position of ovaries. Scale bar: 100 µm.

FIGURES 14–15. 14. Solenofilomorpha pellucida n in Four new species of Acoela from Chile

FIGURES 14–15. 14. Solenofilomorpha pellucida n. sp. Photomicrograph of sagittal histological section stained with hematoxylin-eosin. Scale bar: 100 µm. 15. Solenofilomorpha pellucida n. sp. Schematic drawing of specimen (dorsal view). Scale bar: 100 µm.

FIGURE 12. Pseudaphanostoma hyalinorhabdoida n in Four new species of Acoela from Chile

FIGURE 12. Pseudaphanostoma hyalinorhabdoida n. sp. Details of the 50% consensus tree after bootstrap analysis of the concatenated 18S, 28S and COI dataset showing the position of this species.