The phylogenetic position of the Aeolosomatidae and Parergodrilidae, two enigmatic oligochaete-like taxa of the 'Polychaeta', based on molecular data from 18S rDNA sequences

2002 ◽  
Vol 40 (3) ◽  
pp. 155-163 ◽  
Author(s):  
T. Struck ◽  
R. Hessling ◽  
G. Purschke
Keyword(s):  
18S Rdna ◽  
Molecular Data ◽  
Phylogenetic Position ◽  
Rdna Sequences ◽  
18S Rdna Sequences

Eimeria trichosuri: Phylogenetic position of a marsupial coccidium, based on 18S rDNA sequences

2009 ◽  
Vol 122 (2) ◽  
pp. 165-168 ◽  
Author(s):  
M.L. Power ◽  
C. Richter ◽  
S. Emery ◽  
J. Hufschmid ◽  
M.R. Gillings
Keyword(s):  
18S Rdna ◽  
Phylogenetic Position ◽  
Rdna Sequences ◽  
18S Rdna Sequences

Molecular data implicate bryozoans as hosts for PKX (Phylum Myxozoa) and identify a clade of bryozoan parasites within the Myxozoa

Parasitology ◽  
1999 ◽  
Vol 119 (6) ◽  
pp. 555-561 ◽  
Author(s):  
C. L. ANDERSON ◽  
E. U. CANNING ◽  
B. OKAMURA
Keyword(s):  
18S Rdna ◽  
Phylogenetic Analyses ◽  
Molecular Data ◽  
Salmonid Fish ◽  
Abnormal Immune Response ◽  
Rdna Sequences ◽  
Pectinatella Magnifica ◽  
18S Rdna Sequences ◽  
Cristatella Mucedo ◽  
Distinct Taxon

Proliferative kidney disease (PKD), a condition associated with high mortality in salmonid fish, represents an abnormal immune response to the presence of an enigmatic myxozoan, which has been designated simply as PKX organism because its generic and specific status are obscure. Phylogenetic analyses of partial sequences of the 18S rDNA of PKX and of myxozoan parasites infecting the bryozoans Cristatella mucedo, Pectinatella magnifica and Plumatella rugosa, including the previously named Tetracapsula bryozoides from C. mucedo, showed that these taxa represent a distinct clade that diverged early in the evolution of the Myxozoa before the radiation of the other known myxozoan genera. A common feature of the myxozoans in this clade may be the electron-dense sporoplasmosomes with a lucent bar-like structure, which occur in T. bryozoides and PKX but not in the myxozoans belonging to the established orders Bivalvulida and Multivalvulida. Variation of 0·5–1·1% was found among the PKX 18S rDNA sequences obtained from fish from North America and Europe. The 18S rDNA sequence for T. bryozoides showed that it is a distinct taxon, not closely related to PKX but some sequences from myxozoans infecting 2 of the bryozoan species were so similar to those of PKX as to be indistinguishable. Other sequences from the new myxozoans in bryozoans at first appeared distinct from PKX in a maximum likelihood tree but, when analysed further, were also found to be phylogenetically indistinguishable from PKX. We propose that at least some variants of these new myxozoans from bryozoans are able to infect and multiply in salmonid fish, in which they stimulate the immune reaction and cause PKD but are unable to form mature spores to complete their development.

scholarly journals Phylogenetic position of Oxygyne shinzatoi (Burmanniaceae) inferred from 18S rDNA sequences

2008 ◽  
Vol 121 (4) ◽  
pp. 449-449
Author(s):  
Jun Yokoyama ◽  
Yayoi Koizumi ◽  
Masatsugu Yokota ◽  
Hirokazu Tsukaya
Keyword(s):  
18S Rdna ◽  
Phylogenetic Position ◽  
Rdna Sequences ◽  
18S Rdna Sequences

Monophyly of the family Desmoscolecidae (Nematoda, Demoscolecida) and Its Phylogenetic position inferred from 18S rDNA sequences

2009 ◽  
Vol 27 (5) ◽  
pp. 515-523 ◽  
Author(s):  
Ui Wook Hwang ◽  
Eun Hwa Choi ◽  
Dong Sung Kim ◽  
Wilfrida Decraemer ◽  
Cheon Young Chang
Keyword(s):  
18S Rdna ◽  
Phylogenetic Position ◽  
Rdna Sequences ◽  
The Family ◽  
18S Rdna Sequences

scholarly journals Reconstructing the Phylogeny ofCapsosiphon fulvescens(Ulotrichales, Chlorophyta) from Korea Based onrbcL and 18S rDNA Sequences

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Sang-Mi Sun ◽  
Seung Hwan Yang ◽  
Kirill S. Golokhvast ◽  
Bao Le ◽  
Gyuhwa Chung
Keyword(s):  
Phylogenetic Tree ◽  
18S Rdna ◽  
Phylogenetic Trees ◽  
Economic Value ◽  
Phylogenetic Position ◽  
Therapeutic Effects ◽  
Filamentous Green Algae ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
Taxonomic Studies

Capsosiphon fulvescensis a filamentous green algae in the class Ulvophyceae. It has been consumed as food with unique flavor and soft texture to treat stomach disorders and hangovers, and its economic value justifies studying its nutritional and potential therapeutic effects. In contrast to these applications, only a few taxonomic studies have been conducted onC. fulvescens. In particular, classification and phylogenetic relationships of theC. fulvescensbelow the order level are controversial. To determine its phylogenetic position in the class, we usedrbcL and 18S rDNA sequences as molecular markers to construct phylogenetic trees. The amplifiedrbcL and 18S rDNA sequences from 4C. fulvescensisolates (Jindo, Jangheung, Wando, and Koheung, Korea) were used for phylogenetic analysis by employing three different phylogenetic methods: neighbor joining (NJ), maximum parsimony (MP), and maximum likelihood (ML). TherbcL phylogenetic tree showed that all taxa in the order Ulvales were clustered as a monophyletic group and resolved the phylogenetic position ofC. fulvescensin the order Ulotrichales. The significance of our study is that the 18S rDNA phylogenetic tree shows the detailed taxonomic position ofC. fulvescens. In our result,C. fulvescensis inferred as a member of Ulotrichaceae, along withUrosporaandAcrosiphonia.

Phylogenetic position of the small solitary phaeodarians (Radiolaria) based on 18S rDNA sequences by single cell PCR analysis

2006 ◽  
Vol 59 (2) ◽  
pp. 104-114 ◽  
Author(s):  
T. Yuasa ◽  
O. Takahashi ◽  
J.K. Dolven ◽  
S. Mayama ◽  
A. Matsuoka ◽  
...  
Keyword(s):  
Single Cell ◽  
18S Rdna ◽  
Phylogenetic Position ◽  
Pcr Analysis ◽  
Single Cell Pcr ◽  
Rdna Sequences ◽  
18S Rdna Sequences

scholarly journals Taxonomic resolution of Stylonychia notophora (Alveolata, Ciliophora, Hypotricha) sensu Sapra and Dass 1970 using an integrative approach

2020 ◽  
Vol 70 (6) ◽  
pp. 3939-3952
Author(s):  
Harpreet Kaur ◽  
Shashi ◽  
Alan Warren ◽  
Ram Krishan Negi ◽  
Komal Kamra
Keyword(s):  
18S Rdna ◽  
Species Delimitation ◽  
Indian Population ◽  
Taxonomic Status ◽  
Molecular Data ◽  
Taxonomic Resolution ◽  
Integrative Approach ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
River Yamuna

The spirotrichean ciliate Stylonychia notophora has previously been recorded in India although the descriptions are lacking in detail. It has been suggested several times that the Indian population, S. notophora sensu Sapra and Dass, 1970 collected along the Delhi stretch of the River Yamuna, is identical to Tetmemena pustulata, but this has never been confirmed due to insufficient data for the former. The present study includes detailed descriptions (classical and molecular) of populations of Tetmemena isolated from six locations along the River Yamuna, India. These include four from the Delhi stretch including that from which Sapra and Dass, 1970 isolated their population of S. notophora. Due to the lack of a sufficiently detailed description, the taxonomic status of S. notophora sensu Sapra and Dass, 1970 was not clear. Comparisons among the populations isolated in the present study with previous descriptions of T. pustulata and S. notophora sensu Sapra and Dass, 1970 show only minor differences in morphometry, morphogenesis and in 18S rDNA sequences. The 18S rDNA sequences of all six populations had 99% similarity to both T. pustulata and S. notophora. These findings support the contention that S. notophora sensu Sapra and Dass, 1970 was misidentified and is a population of T. pustulata. This study supports the need for adopting an integrative approach based on morphological, morphogenetic and molecular data in order to understand species delimitation in ciliated protists.

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