First record of the enigmatic genus Redudasys Kisielewski, 1987 (Gastrotricha: Macrodasyida) from the Northern hemisphere

  title={First record of the enigmatic genus Redudasys Kisielewski, 1987 (Gastrotricha: Macrodasyida) from the Northern hemisphere},
  author={Tobias K{\aa}nneby and Mary K. Wicksten},
ABSTRACT Gastrotricha Metschnikoff, 1865 is a small phylum of acoelomatic animals common in both marine and freshwater environments. To date, close to 800 species are known from all over the world. The order Macrodasyida Remane, 1925 [Rao & Clausen, 1970] is almost exclusively marine except for the rare genera Marinellina Ruttner-Kolisko, 1955 and Redudasys Kisielewski, 1987. In this study, we present morphological and molecular data for a potentially new species of Redudasys from the Edwards… 

A new species of Redudasys (Gastrotricha: Macrodasyida: Redudasyidae) from the United States

A new species of Redudasys (Macrodasyida: Redudasyidae) is described from Texas and Oregon, U.S.A. that is morphologically and genetically distinguishable from RedudAsys fornerise Kisielewski, 1987a, the only formally described species in the genus up until now.

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Results support the hypothesis that dispersion into fresh water habitats by Macrodasyida and Chaetonotida taxa occurred independently and that within Macrotricha a single lineage invaded the freshwater environment only once, and the Neotropical region seems to be peculiar for the evolution of the freshwater macrodasyids.

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Diversity of Gastrotricha on Spitsbergen (Svalbard Archipelago, Arctic) with a Description of Seven New Species

In this work, both morphological and morphometric data are provided and the phylogenetic position of the newly described and newly found species are presented based on nuclear 18S rRNA, 28S r RNA and mitochondrial cytochrome c oxidase subunit I sequence data.

Sweet or salty? The origin of freshwater gastrotrichs (Gastrotricha, Chaetonotida) revealed by molecular phylogenetic analysis

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Molecular phylogenetic analyses confirm the results of former studies and clearly place the new taxon in Thaumastodermatidae and propose the establishment of Chimaeradasys gen. nov, a new genus of gastrotrichs from Sardinia and Flores.

Integrated data analysis allows the establishment of a new, cosmopolitan genus of marine Macrodasyida (Gastrotricha)

Details of the external morphology, in combination with the different lay-out of the reproductive system and the tiny spermatozoa lacking a visible flagellum, suggest they belong to a new genus, possibly in the family Macrodasyidae, supported by the phylogenetic relationships of 47 taxa inferred from analyses of the 18S rRNA gene.

A synopsis of knowledge, zoogeography and an online interactive map of Brazilian marine gastrotrichs

A critical analysis of the geographical distribution of Brazilian marine gastrotrichs, an estimate of the number of undescribed species, and a summary of the existence and status of taxonomical collections are presented.

The aquatic annelid fauna of the San Marcos River headsprings, Hays County, Texas

The results of the first survey of the aquatic annelid fauna of the San Marcos Springs are provided, along with a dichotomous key to these annelids that includes photos of some representative specimens, and line drawings to elucidate potentially confusing diagnostic structures.

Instances of erroneous DNA barcoding of metazoan invertebrates: Are universal cox1 gene primers too “universal”?

It is estimated with 95% probability that the chances of finding incorrectly described metazoan sequences in the GenBank depend on the systematic group, and variety from less than 1% (Mollusca and Arthropoda) up to 6.9% (Gastrotricha).



Two new species of Musellifer (Gastrotricha: Chaetonotida) from Florida and Tobago and the systematic placement of the genus within Paucitubulatina

Two new species of marine Gastrotricha are described from the Atlantic coast of Florida and the west coast of Tobago, both of which lack a muzzle bearing the mouth, which is a diagnostic character of the genus Musellifer.

A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden

The phylogenetic hypothesis generated shows that Chaetonotidae is a non-monophyletic group and a new species, Lepidodermella intermedia n.

Gastrotricha: A Marine Sister for a Freshwater Puzzle

From an ecological perspective, the derived position of Redudasys, which is deeply nested within the Macrodasyida clade, unequivocally demonstrates that invasion of freshwater by gastrotrichs has taken place at least twice, in contrast with the single event hypothesis recently put forward.

Analytic taxonomy and notes on marine, brackish-water and estuarine Gastrotricha

Marine Gastrotricha, both Macrodasyida and Chaetonotida, are the subject of an analytic review, citing taxonomic status of names, authorships of taxa, and those responsible for changes, in accordance

New data on freshwater psammic Gastrotricha from Brazil

Preliminary observations suggest that the knowledge of the biodiversity of Gastrotricha in the Minas Gerais State, as well as in the whole Brazil, will certainly increase as further investigations are undertaken, and that freshwater Macrodasyida may be more common than previously thought.

The subterranean amphipod crustacean fauna of an artesian well in Texas

The taxonomically diverse amphipod fauna of the well is believed to be one of the richest of its kind in the world and is composed of five families, six genera, and 10 species, including one family, four generA, and six species newly described herein.

Interrelationships of the Gastrotricha and their place among the Metazoa inferred from 18 S rRNA genes

The congruence of the results with those of the cladistic analysis based on morphological traits provides confidence about the value of each dataset, and calls for widening of the research to include additional taxa of particular phylogenetic significance.

Molecular phylogeny of the phylum Gastrotricha: new data brings together molecules and morphology.

Investigations into the phylogenetic position of Micrognathozoa using four molecular loci

A phylogenetic comparison of four molecular loci for Limnognathia maerski and other newly generated sequences of mainly acoelomate animals showed that Micrognathozoa may constitute an independent lineage from those of Gnathostomulida and Rotifera.

New records of Gastrotricha from Minas Gerais, Brazil

One new form of Chaetonotus acanthocephalus is described and five species appear to be previously unknown taxa; one species is first identified from the state of Minas Gerais.