| 1. | It has short paxillae that give the aboral surface a granular appearance.
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| 2. | On surfaces, they move laterally, with the aboral surface facing the substrate.
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| 3. | Planula larvae swim with the aboral end ( the end away from the mouth ) in front.
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| 4. | Their name comes from the presence of numerous low spines on the aboral ( upper ) surface.
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| 5. | Finally, five lateral canals run along the inside of the test and converge at the aboral pole.
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| 6. | The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates.
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| 7. | The anus is situated on the upper ( aboral ) surface of the test, directly opposite the mouth.
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| 8. | Similarly, a new anus forms on the right side, which becomes the upper, or aboral, surface.
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| 9. | The left side of the larval body becomes the oral surface of the juvenile and the right side the aboral surface.
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| 10. | This is a skeletal plate, or sieve, opening to the water vascular system, located on the aboral surface.
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