Molecular evidence for the non-monophyletic status of Naidinae (Annelida, Clitellata, Tubificidae)

Envall, Ida; Källersjö, Mari; Erséus, Christer

doi:10.1016/j.ympev.2006.03.021

Cited by 50 publications

(48 citation statements)

References 34 publications

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“…The type of coelomocytes found to be unique to the species studied in this article adds more support to the proposed close relationship between Naidinae and Rhyacodrilinae, which has been put forward on the basis of molecular and morphological data (Erséus, 1990;Christensen and Theisen, 1998;Erséus et al, 2000Sjölin et al, 2005;Envall et al, 2006). However, as discussed above, the naidine and rhyacodriline coelomocytes show some similarities to certain coelomocyte types found in enchytraeid and megascolecid species.…”

Section: Phylogenetic Implicationssupporting

confidence: 78%

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Ultrastructural investigation of coelomocytes in representatives of Naidinae and Rhyacodrilinae (Annelida, Clitellata, Tubificidae)

Envall

Erséus

Gustavsson

2008

Journal of Morphology

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Various types of free-floating cells are found in the coelomic fluid of representatives of several annelid groups. The ultrastructure of these "coelomocytes," however, has been studied to a limited degree. In this study, we used a transmission electron microscope to investigate the coelomocytes in specimens of five species of Naidinae and three species of Rhyacodrilinae (all oligochaetous clitellates within the family Tubificidae). These were compared with each other and with previously described coelomocytes of representatives of other oligochaete taxa. Only one distinguishable coelomocyte type was found in the studied specimens: a round to oblong cell without pseudopodia or other appendages, primarily containing membrane-bound granules of varying electron density, a prominent network of rough endoplasmic reticulum, and free ribosomes. This type differs to a great extent from most of the previously described coelomocytes, but shows similarities to certain types found in members of Enchytraeidae and Megascolecidae. Although we noticed some variation, we did not find any ultrastructural characters in these cells obviously useful for phylogenetic studies within Tubificidae.

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Section: Phylogenetic Implicationssupporting

confidence: 78%

“…Rhyacodrilines almost exclusively reproduce sexually. According to a recent phylogenetic study, based on molecular data, both Naidinae and Rhyacodrilinae are non-monophyletic groups, since several genera from Rhyacodrilinae are nested within Naidinae (Envall et al, 2006). A taxonomic revision will thus be necessary.…”

mentioning

confidence: 99%

Ultrastructural investigation of coelomocytes in representatives of Naidinae and Rhyacodrilinae (Annelida, Clitellata, Tubificidae)

Envall

Erséus

Gustavsson

2008

Journal of Morphology

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“…Bayesian analysis of a fivegene data set (Table S4) produced a well-resolved and strongly supported tree in which Paranais, Chaetogaster, and Amphichaeta are not each other's closest relatives. [Previous analyses, based on more limited data sets subsumed within ours, have sometimes recovered a clade composed of Chaetogaster and Amphichaeta, but never one composed of Paranais, Chaetogaster, and Amphichaeta (14,22).] Our inference that each of these genera represents an independent loss of head regeneration is based on the assumption that regeneration losses are more likely than gains.…”

Section: Resultsmentioning

confidence: 68%

“…Naidines sensu lato (Naidinae, Pristininae, and close relatives) are a group of small aquatic oligochaetes, many of which reproduce asexually by fission (13)(14)(15)(16). The most common mode of fission in this group is paratomic fission, in which a new head and tail are intercalated in the middle of the body within a region referred to as the fission zone, thus forming transiently linked individuals (Fig.…”

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confidence: 99%

Latent regeneration abilities persist following recent evolutionary loss in asexual annelids

Bely

Sikes

2009

Proc. Natl. Acad. Sci. U.S.A.

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Regeneration abilities have been repeatedly lost in many animal phyla. However, because regeneration research has focused almost exclusively on highly regenerative taxa or on comparisons between regenerating and nonregenerating taxa that are deeply diverged, virtually nothing is known about how regeneration loss occurs. Here, we show that, following a recent evolutionary loss of regeneration, regenerative abilities can remain latent and still be elicited. Using comparative regeneration experiments and a molecular phylogeny, we show that ancestral head regeneration abilities have been lost three times among naidine annelids, a group of small aquatic worms that typically reproduce asexually by fission. In all three lineages incapable of head regeneration, worms consistently seal the wound but fail to progress to the first stage of tissue replacement. However, despite this coarse-level convergence in regeneration loss, further investigation of two of these lineages reveals marked differences in how much of the regeneration machinery has been abolished. Most notably, in a species representing one of these two lineages, but not in a representative of the other, amputation within a narrow proliferative region that forms during fission can still elicit regeneration of an essentially normal head. Thus, the presence at the wound site of elements characteristic of actively growing tissues, such as activated stem cells or growth factors, may permit blocks to regeneration to be circumvented, allowing latent regeneration abilities to be manifested. regeneration loss | Annelida | asexual reproduction | evolution

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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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Molecular evidence for the non-monophyletic status of Naidinae (Annelida, Clitellata, Tubificidae)

Cited by 50 publications

References 34 publications

Ultrastructural investigation of coelomocytes in representatives of Naidinae and Rhyacodrilinae (Annelida, Clitellata, Tubificidae)

Ultrastructural investigation of coelomocytes in representatives of Naidinae and Rhyacodrilinae (Annelida, Clitellata, Tubificidae)

Latent regeneration abilities persist following recent evolutionary loss in asexual annelids

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

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