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.

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.

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.

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

Morphology and Molecular Phylogeny of the Soil Ciliate Cyrtohymena seorakensis sp. n. (Ciliophora, Hypotricha, Oxytrichidae)

Zootaxa ◽  
2020 ◽  
Vol 4758 (3) ◽  
pp. 561-572
Author(s):  
ATEF OMAR ◽  
JAE-HO JUNG
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
Molecular Phylogeny ◽  
18S Rdna ◽  
Indian Population ◽  
Cortical Granules ◽  
Moss Sample ◽  
Rdna Sequences ◽  
18S Rdna Sequences ◽  
Soil Ciliate

The morphology and infraciliature of a new ciliate, Cyrtohymena seorakensis sp. n., discovered in a moss sample from South Korea, were investigated. The new species is distinguished from congeners by having rather fewer, randomly scattered, yellowish cortical granules, 23–30 adoral membranelles, invariably four transverse cirri in morphostatic specimens, and a total of 62 dorsal bristles on average. Phylogenetic analysis based on 18S rDNA sequences showed that the new species clusters with an Indian population of C. citrina. 

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