| 11. | Unlike many other gastropods, they are more or less bilaterally symmetrical in their external appearance.
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| 12. | Both bipinnaria and brachiolaria larvae are bilaterally symmetrical.
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| 13. | The cleavage of bryozoan eggs is biradial, in other words the early stages are bilaterally symmetrical.
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| 14. | The patterns are not perfectly bilaterally symmetrical and can vary between different individuals in the species.
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| 15. | The generalized mollusc is bilaterally symmetrical and has a single, " limpet-like " shell on top.
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| 16. | The approximately 400 species of flatfish also lack symmetry as adults, though the larvae are bilaterally symmetrical.
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| 17. | In bilaterally symmetrical organisms there is often a major mesentery separating the two halves of the coelom.
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| 18. | This shell spoon is not bilaterally symmetrical.
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| 19. | In bilaterally symmetrical animals, nervous tissues concentrate at the anterior region, forming structures responsible for information processing.
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| 20. | The gray leaves are covered with soft hairs, with bright red bilaterally symmetrical flowers growing in pairs.
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