| 11. | The male will then grow skin over the eggs to form a brood pouch.
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| 12. | The eggs are incubated inside the brood pouch for 30 to 40 days before hatching.
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| 13. | The females of " Tylomelania mahalonensis " usually have 1-11 embryos in their brood pouch.
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| 14. | The females of " Tylomelania towutica " usually have 1-7 embryos in their brood pouch.
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| 15. | The females of " Tylomelania masapensis " usually have 1-5 embryos in their brood pouch.
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| 16. | The females of " Tylomelania sarasinorum " usually have 1-14 embryos in their brood pouch.
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| 17. | The females of " Tylomelania abendanoni " usually have 1-4 embryos in their brood pouch.
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| 18. | Many species osmoregulate the brood pouch fluid to maintain proper pH for the developing embryos.
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| 19. | Males possessing brood pouches release their sperm directly into them; the pouches are then vigorously shaken.
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| 20. | After implantation in or on the brood pouch or brood patch, the male incubates the eggs.
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