Analysis of 18S rRNA gene sequences suggests significant molecular differences between Macrodasyida and Chaetonotida (Gastrotricha)

Manylov, Oleg; Vladychenskaya, N. S.; Milyutina, Irina A.; Kedrova, O. S.; Korokhov, Nikolai P.; Dvoryanchikov, Gennady; Aleshin, Vladimir V.; Петров, Н. Б.

doi:10.1016/s1055-7903(03)00251-3

Cited by 35 publications

(30 citation statements)

References 20 publications

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“…As there is no data available concerning the protonephridial system of Musellifer species, we will in fact only make assumptions for the stem species of Paucitubulata exclusive the taxon Musellifer. Implying the hypothesised basal position of the Xenotrichulidae within Paucitubulata (Manylov et al 2004;Todaro et al 2003;Travis 1983), we nevertheless think that our conclusions for the ground pattern of Paucitubulata are well founded. If further phylogenetic studies support the basal position of Musellifer within Paucitubulata or at least support a position as the sister group of Xenotrichulidae (Marotta et al 2005), an investigation of the protonephridial system of Musellifer will be necessary for the reconstruction of the ground pattern of Paucitubulata.…”

Section: Relationships Within Gastrotrichamentioning

confidence: 51%

“…Furthermore, the strict consensus tree of another molecular analysis (Manylov et al 2004) implies no conXict with the topology used for our reconstructions. Even if one accepts the putative non-monophyly of Gastrotricha, our reconstructions of the ground pattern of Macrodasyida and the ground pattern of Paucitubulata would have validity.…”

Section: Alternative Phylogenetic Hypothesesmentioning

confidence: 99%

See 1 more Smart Citation

Ultrastructure of protonephridia in Xenotrichula carolinensis syltensis and Chaetonotus maximus (Gastrotricha: Chaetonotida): comparative evaluation of the gastrotrich excretory organs

et al. 2007

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In an attempt to obtain detailed information on the entire protonephridial system in Gastrotricha, we have studied the protonephridial ultrastructure of two paucitubulatan species, Xenotrichula carolinensis syltensis and Chaetonotus maximus by means of complete sets of ultrathin sections. In spite of some diVerences in detail, the morphology of protonephridia in both examined species shows a common pattern: Both species have one pair of protonephridia that consist of a bicellular terminal organ, a voluminous, aciliar canal cell and an adjacent, aciliar nephridiopore cell. The terminal organ consists of two monociliar terminal cells each with a distal cytoplasmic lobe. These lobes interdigitate and surround cilia and microvilli of the terminal cells. Where both lobes interdigitate, a meandering cleft is formed that is covered by the Wltration barrier. We here term the entire structure composite Wlter. The elongated, in some regions convoluted protonephridial lumen opens distally to the outside via a permanent nephridiopore. A comparison with the protonephridia of other species of the Gastrotricha allows hypothesising the following autapomorphies of the Paucitubulata: The bicellular terminal organ with a composite Wlter, the convoluted distal canal cell lumen and the absence of cilia, ciliary basal structures and microvilli within the canal cell. Moreover, this comparative survey could conWrm important characteristics of the protonephridial system assumed for the ground pattern of Gastrotricha like, for example, the single terminal cell with one cilium surrounded by eight microvilli.

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Section: Relationships Within Gastrotrichamentioning

confidence: 51%

Section: Alternative Phylogenetic Hypothesesmentioning

confidence: 99%

Ultrastructure of protonephridia in Xenotrichula carolinensis syltensis and Chaetonotus maximus (Gastrotricha: Chaetonotida): comparative evaluation of the gastrotrich excretory organs

et al. 2007

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“…In the 1920s, the German zoologist Adolph Remane discovered dozens of new taxa of marine gastrotrichs inha-Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/16/15 1:05 PM more closely associated with taxa such as Plathelminthes, Gnathostomulida or Rotifera rather than with Macrodasyida (Manylov et al 2004;Fig. 1.53 E).…”

Section: Phylogenymentioning

confidence: 99%

1. Gastrotricha

Kieneke¹,

Schmidt‐Rhaesa²

2014

Gastrotricha and Gnathifera

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“…These studies are based on a fairly comprehensive taxon sampling among the gastrotrich families (Todaro et al . 2003, 2006a; Zrzavý 2003; Manylov et al . 2004; Petrov et al .…”

Section: Introductionmentioning

confidence: 99%

Novel implications for the basal internal relationships of Gastrotricha revealed by an analysis of morphological characters

Kieneke¹,

Riemann²,

Ahlrichs³

2008

Zoologica Scripta

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Novel implications for the basal internal relationships of Gastrotricha revealed by an analysis of morphological characters. -Zoologica Scripta , 37 , 429-460. A cladistic analysis of Gastrotricha based on morphological characters is presented. Unlike previous morphological analyses, our study uses species rather than higher level taxa, for which the ground pattern is often unknown. The analysis comprises 79 ingroup taxa, 4 outgroup taxa and 135 binary and multistate characters in total. Character coding is based on a careful assessment of original species descriptions. Characters included cover general body organization, internal and external features as, for example, data on the adhesive tubes, digestive tract or cuticle armament. Character systems such as many ultrastructural findings, for which it was problematic to obtain data for a large set of the included taxa, were not considered. To minimize a priori assumptions, all characters were treated with equal weight and left unordered. The four outgroup representatives were chosen in accordance with the current sister group hypotheses for Gastrotricha. Two search strategies, a heuristic search (maximum parsimony) and a parsimony ratchet search, reveal a comparable scenario. Gastrotricha split into two sister taxa. One group comprises genus Neodasys only, the sister group N.N.1 (Eutubulata nom. nov.) consists of all remaining Gastrotricha. Within Eutubulata, monophyletic Macrodasyida s. str. and N.N.2 (Abursata nom. nov.) are sister taxa of highest rank. Abursata consists of the 'freshwater macrodasyids' Marinellina and Redudasys as sister group of monophyletic Paucitubulatina. Some traditional families are supported by this analysis. We evaluate possible apomorphies for the most basal stem lineages and track the evolution of selected organs. Our findings reveal that secondary character loss may play an important role in the stem lineage of Abursata and further in Paucitubulatina. Moreover, according to this analysis there might have been a single invasion of the freshwater environment in the stem lineage of Abursata followed by several independent returns to marine habitats within the monophylum Paucitubulatina.

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Analysis of 18S rRNA gene sequences suggests significant molecular differences between Macrodasyida and Chaetonotida (Gastrotricha)

Cited by 35 publications

References 20 publications

Ultrastructure of protonephridia in Xenotrichula carolinensis syltensis and Chaetonotus maximus (Gastrotricha: Chaetonotida): comparative evaluation of the gastrotrich excretory organs

Ultrastructure of protonephridia in Xenotrichula carolinensis syltensis and Chaetonotus maximus (Gastrotricha: Chaetonotida): comparative evaluation of the gastrotrich excretory organs

1. Gastrotricha

Novel implications for the basal internal relationships of Gastrotricha revealed by an analysis of morphological characters

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