Abstract:
:While rigorous techniques have usually been used to generate phylogenetic trees from molecular data, morphological analysis has sometimes been more informal. A recent example was a study of the evolution of the fultoportula in the diatom order Thalassiosirales (Kaczmarska et al. 2006). Phylogeny was inferred using modern phylogenetic principles applied to nuclear SSU rDNA sequences, but inferences about morphological character evolution were made using noncanonical reasoning and evolutionary scenario building. The preferred hypothesis posited that marginal fultoportulae evolved from the marginal ridge of Lithodesmiales. A related hypothesis suggested that fultoportulae in the valve center were not homologous with those near the valve margin. Shared symplesiomorphies, shared homoplasies, gaps in the fossil record, and subtle morphological differences between central- and marginal-area fultoportulae were offered as the primary evidence for these scenarios. The literature has demonstrated such arguments to be either irrelevant or logically weaker than inferences made under the tests of similarity, conjunction, and congruence. Five prior hypotheses about the origin and evolution of the fultoportula were examined in this study using these tests. The hypothesis that the areola evolved into the multistrutted process, which evolved into the fultoportula, was best supported.
journal_name
J Phycoljournal_title
Journal of phycologyauthors
Theriot ECdoi
10.1111/j.1529-8817.2008.00522.xsubject
Has Abstractpub_date
2008-06-01 00:00:00pages
821-33issue
3eissn
0022-3646issn
1529-8817journal_volume
44pub_type
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journal_title:Journal of phycology
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pub_type: 杂志文章
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journal_title:Journal of phycology
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journal_title:Journal of phycology
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journal_title:Journal of phycology
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更新日期:2014-06-01 00:00:00
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journal_title:Journal of phycology
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journal_title:Journal of phycology
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journal_title:Journal of phycology
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journal_title:Journal of phycology
pub_type: 杂志文章
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journal_title:Journal of phycology
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journal_title:Journal of phycology
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journal_title:Journal of phycology
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journal_title:Journal of phycology
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更新日期:2013-02-01 00:00:00
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更新日期:2011-12-01 00:00:00
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journal_title:Journal of phycology
pub_type: 杂志文章
doi:10.1111/j.1529-8817.2008.00548.x
更新日期:2008-08-01 00:00:00