On the Phylogenetic Position of Rotifera – Have We Come Any Further?

Funch, Peter; Sørensen, Martin V.; Obst, Matthias

doi:10.1007/s10750-005-4093-6

Cited by 47 publications

(13 citation statements)

References 79 publications

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“…Molecular analyses thus far support a monophyletic Syndermata but fail to recover consistent relationships among syndermate lineages [5], [50], [59], [66], [67], [68]. The gene(s) comprising each dataset and the different analytical methods and/or taxonomic sampling strategies employed all contribute to different results.…”

Section: Discussionmentioning

confidence: 97%

A Mitogenomic Re-Evaluation of the Bdelloid Phylogeny and Relationships among the Syndermata

Lasek‐Nesselquist

2012

PLoS ONE

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Molecular and morphological data regarding the relationships among the three classes of Rotifera (Bdelloidea, Seisonidea, and Monogononta) and the phylum Acanthocephala are inconclusive. In particular, Bdelloidea lacks molecular-based phylogenetic appraisal. I obtained coding sequences from the mitochondrial genomes of twelve bdelloids and two monogononts to explore the molecular phylogeny of Bdelloidea and provide insight into the relationships among lineages of Syndermata (Rotifera + Acanthocephala). With additional sequences taken from previously published mitochondrial genomes, the total dataset included nine species of bdelloids, three species of monogononts, and two species of acanthocephalans. A supermatrix of these 10–12 mitochondrial proteins consistently recovered a bdelloid phylogeny that questions the validity of a generally accepted classification scheme despite different methods of inference and various parameter adjustments. Specifically, results showed that neither the family Philodinidae nor the order Philodinida are monophyletic as currently defined. The application of a similar analytical strategy to assess syndermate relationships recovered either a tree with Bdelloidea and Monogononta as sister taxa (Eurotatoria) or Bdelloidea and Acanthocephala as sister taxa (Lemniscea). Both outgroup choice and method of inference affected the topological outcome emphasizing the need for sequences from more closely related outgroups and more sophisticated methods of analysis that can account for the complexity of the data.

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Section: Discussionmentioning

confidence: 97%

A Mitogenomic Re-Evaluation of the Bdelloid Phylogeny and Relationships among the Syndermata

Lasek‐Nesselquist

2012

PLoS ONE

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“…1998; Giribet et al. 2000, 2004; Sørensen 2003; Halanych 2004; Jenner 2004; Funch et al. 2005; Passamaneck and Halanych 2006).…”

Section: Introductionmentioning

confidence: 99%

New data from an enigmatic phylum: evidence from molecular sequence data supports a sister-group relationship between Loricifera and Nematomorpha

Sørensen¹,

Hebsgaard²,

Heiner³

et al. 2008

Journal of Zoological Systematics and Evolutionary Research

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Loricifera is one of the most recently discovered animal phyla. So far, the group has been considered closely related to Kinorhyncha and Priapulida, and assigned to the ecdysozoan clade Cycloneuralia. Using Bayesian inference, we present the first phylogeny that includes 18S rRNA and Histone 3 sequences from two species of Loricifera. Intriguingly, we find support for a sister-group relationship between Loricifera and Nematomorpha. Such relationship has not been suggested previously and the results imply that a revision of our conception of early ecdysozoan evolution is required. Additionally, the data suggest that evolution through progenesis (sexual maturation of larvae) may have played an important role among the ancestral cycloneuralians.

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“…While the function(s) of this variation is largely speculative, the integumental organization is still considered homologous throughout Rotifera (Clément & Wurdak ; Funch et al. ).…”

mentioning

confidence: 99%

“…Significant variation is present in the ultrastructural organization of the ICL across all four clades including the Bdelloidea (Koehler 1965(Koehler , 1966Storch & Welsch 1969;Cl ement & Wurdak 1991), Monogononta (Koehler 1966;Cl ement 1969Cl ement , 1977Cl ement , 1980Storch & Welsch 1969;Brodie 1970;Cl ement & Wurdak 1991), Seisonacea (Ahlrichs 1997), and Acanthocephala (reviewed in Dunagan & Miller 1990). While the function(s) of this variation is largely speculative, the integumental organization is still considered homologous throughout Rotifera (Cl ement & Wurdak 1991;Funch et al 2005). a Author for correspondence.…”

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confidence: 99%

Ultrastructure of the rotifer integument: peculiarities of Sinantherina socialis (Monogononta: Gnesiotrocha)

Hochberg

Chan

2015

Invertebrate Biology

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The rotifer integument is a well-described syncytium that contains an apical intracytoplasmic lamina (ICL) that functions for both skeletal support and muscle insertion. To date, there is limited information on the structure of the integument in species of Gnesiotrocha, a diverse subclade of Monogononta that consists of solitary, colonial, sessile, and planktonic species. In this study, we examined the ultrastructure of the integument in the colonial rotifer Sinantherina socialis to determine how it corresponds to that of other monogononts. The integument of S. socialis was broadly similar to that of other rotifers, consisting of a thickened glycocalyx, multilaminate ICL, and syncytial epidermis. However, it was different in several regards. The ICL consisted of three distinct layers from apical to basal: layer 1 consisted of at least two electron-dense laminae; layer 2 was a thickened matrix of amorphous, electron-dense material or was fibrous; and layer 3 was an electrondense lamina of varying thickness that covered the underlying syncytium. Significantly, layers 1 and 2 formed a ridge-and-groove like system of finger-like projections across the trunk surface that has not been observed in other rotifers. A voluminous syncytial cytoplasm (up to 3 lm thick) was present beneath the ICL and was mostly electron lucent and with few organelles. Bundles of potential microtubules were scattered throughout the syncytium. We hypothesize that the voluminous cytoplasm with microtubules serves as skeletal support for the rotifer's sessile lifestyle, while the external ridges may function as a texturebased deterrent to predators, or serves to trap secretions from the species' defensive glands. Basally, the epidermis was highly folded and bordered by a thin basal lamina that separated the plasmalemma from the blastocoel. Membrane-bound vesicles were present throughout the integument's cytoplasm and are hypothesized to function in the secretion of extracellular matrix and in the maintenance of the ICL.

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On the Phylogenetic Position of Rotifera – Have We Come Any Further?

Cited by 47 publications

References 79 publications

A Mitogenomic Re-Evaluation of the Bdelloid Phylogeny and Relationships among the Syndermata

A Mitogenomic Re-Evaluation of the Bdelloid Phylogeny and Relationships among the Syndermata

New data from an enigmatic phylum: evidence from molecular sequence data supports a sister-group relationship between Loricifera and Nematomorpha

Ultrastructure of the rotifer integument: peculiarities of Sinantherina socialis (Monogononta: Gnesiotrocha)

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