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Rieger, Reinhard M.

doi:10.1023/a:1003423025252

Cited by 14 publications

(3 citation statements)

References 180 publications

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“…The study of biological and environmental factors involved in planarian reproduction and regeneration may shed some light on the cellular and molecular mechanisms involved, and the possible correlations between them. It has been recognized in short-term cultures that turbellarians that employ different reproductive modes (sexual, asexual by parthenogenesis, or asexual by fissiparity) may help in understanding the evolution of reproductive strategies and the function of sexuality (Benazzi 1981;Rieger 1998;Kobayashi et al 1999a,b).…”

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confidence: 99%

Reproductive modes and life cycles of freshwater planarians (Platyhelminthes, Tricladida, Paludicula) from southern Brazil

Knakievicz

Vieira

Erdtmann

et al. 2006

Invertebrate Biology

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Abstract. Life cycles, ploidy levels, reproductive modes, and regeneration capacities of laboratory populations of the southern Brazil freshwater planarians Girardia tigrina and Girardia schubarti were studied. The mating behavior and life cycle of different populations from both species were analyzed regarding their karyotype, body size, modes of reproduction, and regeneration potential. Reproduction was evaluated according to fecundity, fertility, and fissiparity indices. In both species we observed that diploid planarians are ∼25% larger than triploid or mixoploid ones and that sexually reproducing populations have more offspring than asexual ones. Cocoon incubation time was shorter for G. tigrina, and G. schubarti showed a higher frequency of spontaneous malformations. G. tigrina was both more fecund (produced more cocoons) and more fertile (produced more hatchlings) than G. schubarti. The effects of alternative food sources (liver or egg yolk), demographic density, and water–salt concentration were evaluated in different populations of both species. All evaluated environmental factors had effects on fecundity and fertility indices and were more prominent for G. schubarti than for G. tigrina. Our data suggest that the populations of G. schubarti were more sensitive to environmental factors, and thus may be useful as bioindicators.

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confidence: 99%

Reproductive modes and life cycles of freshwater planarians (Platyhelminthes, Tricladida, Paludicula) from southern Brazil

Knakievicz

Vieira

Erdtmann

et al. 2006

Invertebrate Biology

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“…Through this study, we hope to contribute to preserving these historical and creative aspects of Ernest Marcus -one amongst the most prominent zoologists of the 20 th century (Sawaya, 1970;Mendes, 1994;Zarur, 1994) -and those of his school. and for his help with some English-derived epithets.…”

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confidence: 99%

A study on the etymology of the scientific names given to planarians (Platyhelminthes, Tricladida) by Ernest Marcus’ school

2021

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Leading zoologist and taxonomist Ernest Marcus (1893-1968) and his school described numerous new invertebrate taxa, including planarians, or triclads (Platyhelminthes). These authors rarely provided the etymology of names for the new taxa. In this paper, the etymology of 149 names of genera and specific epithets of planarians lacking etymology (or honoring people) is investigated. The etymology of most names was retrieved from original descriptive papers and from Eudóxia Maria Froehlich’s recollections, a fellow of Marcus’ school. It was discovered that the names were usually freely derived from words of the language spoken in the country where the species was found. Some names were motivated by an aspect of the biology of the species. Other names honored people or are arbitrary. The etymology of 19 names could not be retrieved and are only suggested. The origin of another 19 names could not be discovered, nor even their meaning. Knowing the etymology makes it easier to memorize a name and it is a way to preserve the historical and emotional aspects of the authors. Through the retrieved etymologies, the personality of Marcus can also be glimpsed.

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“…Despite a few detailed studies of these organ systems in kalyptorhynchs (e.g. Schilke, 1970a; Rieger, 1974; Schockaert, 1974; Artois & Schockaert, 2003, 2005a; see also Seth Tyler's literature database at turbellaria.umaine.edu), the diversity and evolutionary history of kalyptorhynchs remains poorly known (Karling, 1983a; Rieger, 1998).…”

Section: Introductionmentioning

confidence: 99%

Molecular examination of kalyptorhynch diversity (Platyhelminthes: Rhabdocoela), including descriptions of five meiofaunal species from the north-eastern Pacific Ocean

Rundell

Leander

2014

J. Mar. Biol. Ass.

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The spaces between sand grains are home to a myriad of microscopic marine eukaryotes, including kalyptorhynch rhabdocoels equipped with an eversible proboscis that enables them to capture microscopic prey living in these environments. The structure of the kalyptorhynch proboscis separates the two major subclades within the group: the Schizorhynchia (bifurcated proboscis) and the Eukalyptorhynchia (unbranched proboscis). A survey of meiofaunal metazoans in the Pacific north-west led to the discovery of three new schizorhynch species (Undicola tofinoensis gen. nov., sp. nov., Schizorhinos vancouverensis gen. nov., sp. nov. and Linguabana tulai gen. nov., sp. nov.) and two new eukalyptorhynch species (Thinodactylaina tlaoquiahtensis gen. nov., sp. nov. and Rostracilla nuuchahnulthensis gen. nov., sp. nov.). This survey also recovered the putative cosmopolitan eukalyptorhynch (Polycystididae) Gyratrix hermaphroditus Ehrenberg, 1831. We performed molecular phylogenetic analyses on 18S rDNA sequences from all five novel isolates and from all available kalyptorhynch species in GenBank. The molecular data supported the monophyly of the Eukalyptorhynchia and Schizorhynchia and helped demonstrate the boundaries between different species within the Kalyptorhynchia.

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Cited by 14 publications

References 180 publications

Reproductive modes and life cycles of freshwater planarians (Platyhelminthes, Tricladida, Paludicula) from southern Brazil

Reproductive modes and life cycles of freshwater planarians (Platyhelminthes, Tricladida, Paludicula) from southern Brazil

A study on the etymology of the scientific names given to planarians (Platyhelminthes, Tricladida) by Ernest Marcus’ school

Molecular examination of kalyptorhynch diversity (Platyhelminthes: Rhabdocoela), including descriptions of five meiofaunal species from the north-eastern Pacific Ocean

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