| 1. | They are particularly well-developed in sea butterflies.
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| 2. | Sea butterflies are part of the clade Thecosomata.
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| 3. | These microscopic invertebrates known as sea butterflies are unable to form their outer shells and die.
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| 4. | Pteropoda encompasses the two clades Thecosomata, the sea butterflies, and Gymnosomata, the sea angels.
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| 5. | Sea butterflies of the order Thecosomata have a shell, while sea angels in the order Gymnosomata do not.
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| 6. | Little is known about the behaviour of sea butterflies, but they are known to have a peculiar way of feeding.
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| 7. | They have larger, broader parapodia, and most species retain a shell; they are commonly known as sea butterflies.
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| 8. | The "'Limacinidae "'are a marine gastropod mollusks in the clade Thecosomata ( sea butterflies ).
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| 9. | This pelagic snail is not at all closely related to the pelagic opistobranchs such as the sea angels and sea butterflies.
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| 10. | This is faster than their prey, the sea butterfly, which swims at speeds up to approximately 50 mm / s.
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