Rapidly Evolving Lineages Impede the Resolution of Phylogenetic Relationships among Clitellata (Annelida)

Martin, Patrick; Kaygorodova, Irina A.; Sherbakov, D. Yu.; Verheyen, Erik

doi:10.1006/mpev.1999.0764

Cited by 50 publications

(42 citation statements)

References 57 publications

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“…Parsimony analysis resulted in 17 equally most-parsimonious trees (¢gure 1). The analysis under maximum likelihood yielded a very low maximumlikelihood estimate of the shape parameter of the gamma distribution (0.27), con¢rming previous studies (Abouheif et al 1998;Martin et al 2000) and the importance of taking between-site rate variation into account in phylogenetic analyses of the 18S rRNA gene with this method.…”

Section: Resultssupporting

confidence: 80%

“…A, Acanthobdellida; B, Branchiobdellida; E, Euhirudinea; L, Lumbriculidae; Lb, Lumbricidae; En, Enchytraeidae.) tree 7lnL Á7lnL p -value references (L,(B,(A,E))) 18 284.8 best ö Purschke et al (1993), Siddall & Burreson (1996), Ferraguti & Erse¨us (1999), Brinkhurst (1999a), Martin et al (2000) and this study (maximumparsimony tree) (¢gure 3) ((L,B), (A,E) event the resolution of the respective position of leeches and leech-like worms among oligochaetes will be fraught with extreme di¤culties in future studies, whatever the gene under scrutiny.…”

Section: (B) Phylogenetic Relationships Within the Clitellatamentioning

confidence: 99%

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On the origin of the Hirudinea and the demise of the Oligochaeta

Martin

2001

Proc. R. Soc. Lond. B

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The phylogenetic relationships of the Clitellata were investigated with a data set of published and new complete 18S rRNA gene sequences of 51 species representing 41 families. Sequences were aligned on the basis of a secondary structure model and analysed with maximum parsimony and maximum likelihood. In contrast to the latter method, parsimony did not recover the monophyly of Clitellata. However, a close scrutiny of the data suggested a spurious attraction between some polychaetes and clitellates. As a rule, molecular trees are closely aligned with morphology-based phylogenies. Acanthobdellida and Euhirudinea were reconciled in their traditional Hirudinea clade and were included in the Oligochaeta with the Branchiobdellida via the Lumbriculidae as a possible link between the two assemblages. While the 18S gene yielded a meaningful historical signal for determining relationships within clitellates, the exact position of Hirudinea and Branchiobdellida within oligochaetes remained unresolved. The lack of phylogenetic signal is interpreted as evidence for a rapid radiation of these taxa. The placement of Clitellata within the Polychaeta remained unresolved. The biological reality of polytomies within annelids is suggested and supports the hypothesis of an extremely ancient radiation of polychaetes and emergence of clitellates.

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Section: Resultssupporting

confidence: 80%

Section: (B) Phylogenetic Relationships Within the Clitellatamentioning

confidence: 99%

On the origin of the Hirudinea and the demise of the Oligochaeta

Martin

2001

Proc. R. Soc. Lond. B

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“…In the last decade, the access to DNA sequence data has revealed phylogenetic relationships among various clitellate groups that were not obvious from analyses of morphological characters alone (Siddall & Burreson 1998;Trontelj et al 1999;Martin et al 2000;Martin 2001;Siddall et al 2001;Erséus & Källersjö 2004;Erséus 2005;Sjö lin et al 2005;Envall et al 2006). It can be expected that molecular systematics will be an important instrument to resolve many of the old controversies in enchytraeid taxonomy as well.…”

Section: A Modern Approach To the Marionina Problemmentioning

confidence: 99%

In search ofMarionina(Clitellata, Enchytraeidae): A taxonomic history of the genus and re‐description of the type speciesPachydrilus georgianusMichaelsen, 1888

Rota

Matamoros

Erséus

2008

Italian Journal of Zoology

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An approach towards a systematic revision of Marionina Michaelsen, 1890 is made through an historical overview of its nomenclature and definition, and a thorough characterization of its type species, the South Georgian marine littoral Pachydrilus georgianus Michaelsen, 1888. Relevant sections of early enchytraeid literature provide the background for appreciating the complex taxonomic history of the genus and giving a final word as to the controversial validity of its name, authority and date. Marionina in its current acceptation comprises about 100 nominal species, but the paper documents how, since its establishment, the genus has been an artificial assemblage of unrelated taxa, whose taxonomy cannot be sorted out (1) without finding new morphological characters and improving the standard of descriptions, and (2) without using a total evidence approach (morphology and molecules) within a phylogenetic framework. Confusion about the identity of the type species, originally briefly described and only partially figured, is unravelled upon examination of the syntypes available in Hamburg and Berlin. Since neither series proved to be monospecific, a lectotype is designated to assure correct and consistent application of the name in the future.

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“…2), using the leech Hirudinea medicinalis as an outgroup taxon. An additional oligochaete sequence, for Lumbriculus variegatus, was also used as an outgroup of Tubificidae, based on previous phylogenetic studies (Martin et al 2000).…”

Section: Phylogenetic Analysis Of Tubifex Ignotusmentioning

confidence: 99%

Small subunit ribosomal DNA characterization of an unidentified aurantiactinomyxon form and its oligochaete host Tubifex ignotus

Negredo¹,

Dillane²,

Mf³

2003

Dis. Aquat. Org.

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In this study, the small subunit (18S) ribosomal DNA gene from an aurantiactinomyxon form of unknown taxonomic position (A1) and from its aquatic oligochaete host (Tubifex ignotus) were characterized. Molecular sequence information on A1 was obtained to allow comparisons of this gene with known sequences from known myxosporean forms, and therefore to investigate possible relationships between this organism and its alternate myxosporean stage. Sequence data for the oligochaete host, together with morphological features, will allow reliable identification of this species in the future. Sequence data derived from the 18S DNA gene and data from other related or non-related organisms were analyzed and used to construct a phylogenetic tree. Phylogenetic studies provided an insight into the taxonomic position of A1. Sequence similarities within the 18S rDNA A1 gene and compared organisms indicated that A1 was most closely related to members of the suborder Variisporina (Myxidium lieberkuehni [Ml] and Sphaerospora oncorhynchi [So]). Clustering of the 3 organisms in the same branch was well supported by high bootstrap values (81%). A1 showed higher similarities with sequences of Ml (approximately 80%) than with So (approximately 79%). Myxosporean sequence analysis indicated that phylogenetic arrangements do not support traditional classification based on morphological criteria of the spores, but rather support arrangement by tissue location. Marine actinosporeans Triactinomyxon sp. and Tetraspora discoidea were found to be associated with Platysporinid myxosporeans, supporting previous findings. In this study, 18S rDNA sequence data are generated for first time for the aquatic oligochaete T. ignotus. Phylogenetic 18S rDNA gene analyses performed with T. ignotus support and confirm existing morphological and molecular phylogenetic studies. Paraphyly of the Tubificidae family was noticed. KEY WORDS: Aurantiactinomyxon · Tubifex ignotus · 18S rDNA sequences · Phylogenetic analysisResale or republication not permitted without written consent of the publisher

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Rapidly Evolving Lineages Impede the Resolution of Phylogenetic Relationships among Clitellata (Annelida)

Cited by 50 publications

References 57 publications

On the origin of the Hirudinea and the demise of the Oligochaeta

On the origin of the Hirudinea and the demise of the Oligochaeta

In search ofMarionina(Clitellata, Enchytraeidae): A taxonomic history of the genus and re‐description of the type speciesPachydrilus georgianusMichaelsen, 1888

Small subunit ribosomal DNA characterization of an unidentified aurantiactinomyxon form and its oligochaete host Tubifex ignotus

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