| 11. | Also it is today often seen as a " nomen dubium ".
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| 12. | It has been generally ignored as a " nomen dubium " ever since.
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| 13. | It is classified as a nomen dubium.
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| 14. | This name is considered a nomen dubium.
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| 15. | In 2004 David B . Norman concluded it was a " nomen dubium ".
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| 16. | However, many researchers consider the taxon to be a " nomen dubium ".
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| 17. | Because of the limited remains, it is considered a " nomen dubium ".
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| 18. | It has no diagnostic features, and thus is a " nomen dubium ".
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| 19. | This name is considered a nomen dubium
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| 20. | It is currently considered a " nomen dubium " as the material is so limited.
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