scholarly journals Halanonchus scintillatulus sp. nov. from New Zealand and a review of the suborder Trefusiina (Nematoda: Enoplida)

2020 ◽  
Author(s):  
Daniel Leduc ◽  
Zeng Qi Zhao ◽  
Frederic Sinniger
Keyword(s):  
Phylogenetic Analysis ◽  
New Zealand ◽  
Maximum Likelihood ◽  
18S Rdna ◽  
Valid Species ◽  
Female Reproductive System ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
First Time

We provide a review of the enoplid suborder Trefusiina Siddiqi, 1983, based on morphological considerations and analyses of new and published 18S rDNA sequences. We also describe Halanonchus scintillatulus Leduc sp. nov. from the Hauraki Gulf, northern New Zealand, as well as females of Trefusialaimus idrisi Leduc, 2013 from the continental slope of New Zealand. We show for the first time that the structure of the female reproductive system of Trefusialaimus Riemann, 1974 consists of two opposed and outstretched ovaries, an unusual feature for the Enoplida. The Trefusiina did not form a monophyletic group in the 18S rDNA phylogeny due to the placement of Lauratonema Gerlach, 1953 and Trefusialaimus sequences well away from the main Trefusiina clade. However, due to generally weak Maximum Likelihood support values, we refrain from changing the classification of these taxa until more comprehensive analyses can be conducted. Our phylogenetic analysis supports the inclusion of the Trischistomatidae Andrássy, 2007 within the Trefusiina, meaning that all of the enoplid suborders now include at least some terrestrial/freshwater representatives. The Trefusiina currently comprises five families, 14 genera and 92 valid species.

scholarly journals Description of a new marine predatory nematode Latronema dyngi sp. nov. (Nematoda, Chromadorida, Selachinematidae) from the west coast of Sweden and an updated phylogeny of Chromadoria

2020 ◽  
Vol 50 (6) ◽  
Author(s):  
Mohammed Ahmed ◽  
Oleksandr Holovachov
Keyword(s):  
Phylogenetic Analysis ◽  
Maximum Likelihood ◽  
West Coast ◽  
18S Rdna ◽  
Nematode Species ◽  
The West ◽  
Spicule Length ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
Circular Outline

AbstractA new nematode species, Latronema dyngi sp. nov., is described from Skagerrak off the west coast of Sweden with the type locality near Dyngö island. Latronema dyngi sp. nov. is characterized by multispiral amphideal fovea with circular outline, 0.2–0.3 corresponding body diameters wide in males and 0.1–0.2 corresponding body diameters wide in females, 12 cuticular longitudinal ridges and 18–27 precloacal supplements in males. Latronema dyngi sp. nov. most closely resembles L. orcinum in terms of body length; demanian ratios a, b, c and c′; number of amphid turns in males; and the ratio of spicule length to cloacal body diameter. The two species can be differentiated by the number longitudinal ridges on the cuticle (12 for Latronema dyngi sp. nov. vs 20–22 for L. orcinum) and spicule length (65–78 μm for L. dyngi vs 60 for L. orcinum) and shape (weakly arcuate for L. dyngi sp. nov. vs strongly arcuate for L. orcinum). We also performed a maximum likelihood phylogenetic analysis on over 250 nematodes of the subclass Chromadoria based on their nearly full-length 18S rDNA sequences. In agreement with previous studies, our analysis supported Selachinematidae as a monophyletic group and placed Richtersia Steiner, 1916 within Desmodoridae Filipjev, 1922 or just outside of the main Desmodorida clade with the latter placement not well supported.

Phylogenetic Analysis of Tubificidae (Annelida, Clitellata) Based on 18S rDNA Sequences

2000 ◽  
Vol 15 (3) ◽  
pp. 381-389 ◽  
Author(s):  
Christer Erséus ◽  
Tore Prestegaard ◽  
Mari Källersjö
Keyword(s):  
Phylogenetic Analysis ◽  
18S Rdna ◽  
Rdna Sequences ◽  
18S Rdna Sequences

scholarly journals Phylogenetic analysis of protozoa in the rumen contents of cow based on the 18S rDNA sequences

2004 ◽  
Vol 97 (2) ◽  
pp. 378-383 ◽  
Author(s):  
E.C. Shin ◽  
K.M. Cho ◽  
W.J. Lim ◽  
S.Y. Hong ◽  
C.L. An ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
18S Rdna ◽  
Rdna Sequences ◽  
18S Rdna Sequences

Reassignment of the land tortoise haemogregarine Haemogregarina fitzsimonsi Dias 1953 (Adeleorina: Haemogregarinidae) to the genus Hepatozoon Miller 1908 (Adeleorina: Hepatozoidae) based on parasite morphology, life cycle and phylogenetic analysis of 18S rDNA sequence fragments

Parasitology ◽  
2014 ◽  
Vol 141 (12) ◽  
pp. 1611-1620 ◽  
Author(s):  
COURTNEY A. COOK ◽  
SCOTT P. LAWTON ◽  
ANGELA J. DAVIES ◽  
NICO J. SMIT
Keyword(s):  
Phylogenetic Analysis ◽  
Life Cycle ◽  
South African ◽  
18S Rdna ◽  
Taxonomic Position ◽  
Apicomplexan Parasites ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
Primer Sets ◽  
18S Rdna Sequence

SUMMARYResearch was undertaken to clarify the true taxonomic position of the terrestrial tortoise apicomplexan, Haemogregarina fitzsimonsi (Dias, 1953). Thin blood films were screened from 275 wild and captive South African tortoises of 6 genera and 10 species between 2009–2011. Apicomplexan parasites within films were identified, with a focus on H. fitzsimonsi. Ticks from wild tortoises, especially Amblyomma sylvaticum and Amblyomma marmoreum were also screened, and sporogonic stages were identified on dissection of adult ticks of both species taken from H. fitzsimonsi infected and apparently non-infected tortoises. Parasite DNA was extracted from fixed, Giemsa-stained tortoise blood films and from both fresh and fixed ticks, and PCR was undertaken with two primer sets, HEMO1/HEMO2, and HepF300/HepR900, to amplify parasite 18S rDNA. Results indicated that apicomplexan DNA extracted from tortoise blood films and both species of tick had been amplified by one or both primer sets. Haemogregarina  fitzsimonsi 18S rDNA sequences from tortoise blood aligned with those of species of Hepatozoon, rather than those of species of Haemogregarina or Hemolivia. It is recommended therefore that this haemogregarine be re-assigned to the genus Hepatozoon, making Hepatozoon fitzsimonsi (Dias, 1953) the only Hepatozoon known currently from any terrestrial chelonian. Ticks are its likely vectors.

scholarly journals Molecular detection of Rickettsia genus in chigger mites (Trombidiformes: Trombiculidae) collected on small mammals in southeastern brazilian

2019 ◽  
Vol 28 (4) ◽  
pp. 563-568
Author(s):  
Fernando de Castro Jacinavicius ◽  
Ricardo Bassini-Silva ◽  
Sebastián Muñoz-Leal ◽  
Cal Welbourn ◽  
Ronald Ochoa ◽  
...  
Keyword(s):  
Molecular Identification ◽  
Small Mammals ◽  
18S Rdna ◽  
Molecular Detection ◽  
Molecular Analyses ◽  
First Report ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
First Time

Abstract Chiggers are ectoparasites of vertebrates and may cause trombiculiasis or transmit pathogens to their hosts. Specimens collected from rodents and marsupials were morphologically identified as Herpetacarus hertigi, Eutrombicula tinami, Kymocta sp., Quadraseta brasiliensis, Quadraseta falconensis, Quadraseta flochi, Quadraseta mackenziei, Quadraseta pazca, Quadraseta trapezoides, Quadraseta sp., Serratacarus sp., and Trombewingia bakeri. These mites were submitted individually to molecular analyses for the detection of bacteria of the genus Coxiella, Hepatozoon and Rickettsia. Samples were positive to Rickettsia only. Obtained sequences for the gltA (350 pb) and ompA (488 pb) genes were identical to “Candidatus Rickettsia colombianensi”, a species previously detected in ticks. In addition, molecular identification of mites based on 18S rDNA sequences are provided for H. hertigi, Kymocta sp., Q. brasiliensis, Q. pazca, Q. trapezoides, Quadraseta sp., and T. bakeri for the first time. This is the first report of the detection of a Rickettsia sp. in chigger mites collected on rodents in Brazil.

Phylogenetic analysis of nematode nuclear 18S rDNA sequences indicates the genus Tripylina Brzeski, 1963 (Nematoda: Tripylidae de Man, 1876) should be placed in Enoplida

Zootaxa ◽  
2009 ◽  
Vol 2238 (1) ◽  
pp. 25-32 ◽  
Author(s):  
ZENG QI ZHAO ◽  
THOMAS R. BUCKLEY
Keyword(s):  
Phylogenetic Analysis ◽  
New Zealand ◽  
Dna Sequence ◽  
Sequence Data ◽  
Extensive Study ◽  
Dna Sequence Data ◽  
Rdna Sequences ◽  
The Family ◽  
18S Rdna Sequences ◽  
De Man

We have made an extensive study of New Zealand representatives of nematodes from the family Tripylidae de Man, 1876. Based on SSU DNA sequence data and phylogenetic analysis, the genera Tripylina Brzeski, 1964 and Trischistoma Cobb, 1913 are not closely related to Tripyla Bastian, 1865, the type genus of the family Tripylidae de Man 1876. The genus Tripylina is sister to Trischistoma and Trefusia de Man, 1893 and is more closely related to Enoplida than to Triplonchida. Our phylogenetic results indicate that Tripylina should be placed in Enoplida.

Isolation and Cultivation of Endosymbiotic Algae from Green Hydra and Phylogenetic Analysis of 18S rDNA Sequences

2009 ◽  
Vol 58 (1) ◽  
pp. 135-143 ◽  
Author(s):  
Goran Kovačević ◽  
Damjan Franjević ◽  
Biserka Jelenčić ◽  
Mirjana Kalafatić
Keyword(s):  
Phylogenetic Analysis ◽  
18S Rdna ◽  
Green Hydra ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
Endosymbiotic Algae
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