Molecular phylogeny of the family Bacillariaceae based on 18S rDNA sequences: focus on freshwaterNitzschiaof the sectionLanceolatae

Thraustochytrids have become of considerable industrial and scientific interest in the past decade due to their health benefits. Thraustochytrids are found in a wide variety of marine habitats such as the coastal, mangrove and sediments including the deep sea. Thraustochytrids are extremely common on the detritus, macroalgae and decaying leaf, they play an important role as organic matter-degrading microorganisms Thraustochytrids are unicellular, eukaryotic, chemo-organotrophic organisms. Ten thraustochytrids strains PT269, PT270, PT273, PT274, PT279, PT284, PT285, PT287, PT81, PT84 were isolated from four locations in Xuan Thuy mangroves, Nam Dinh. In this report, classification is based on morphology and 18S rDNA sequences. Ten Thraustochytrid strains could be classified into three types of colony and four types of cell morphology. Molecular phylogenetic analysis of 18S rDNA sequences showed homology score to be 99-100% and these strains belonged to four genera in the family Thraustochytriaceae. PT269, PT279, PT284 and PT287 strains belong to Aurantiochytrium genus, they produce amoeboid cells and occur successive binary division. PT273 and PT285 strains belong to Thraustochytrium genus, thallus directly develop and cleave into sporangium. PT274 strain belong to Aplanochytrium genus with two distinct development, amoeboid cells are found, they rapidly round up and become sporangium; and successive binary cell division. PT270, PT81 and PT84 strains belong to genus Schizochytrium, they have successive binary cell division, zoospores release.

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Molecular phylogeny of the Bivalvia inferred from 18S rDNA sequences with particular reference to the Pteriomorphia

Geological Society London Special Publications ◽

10.1144/gsl.sp.2000.177.01.02 ◽

2000 ◽

Vol 177 (1) ◽

pp. 11-29 ◽

Cited By ~ 23

Author(s):

Gerhard Steiner ◽

Sabine Hammer

Keyword(s):

Molecular Phylogeny ◽

18S Rdna ◽

Rdna Sequences ◽

18S Rdna Sequences

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Multiple origins of the ascidian-Prochloron symbiosis: Molecular phylogeny of photosymbiotic and non-symbiotic colonial ascidians inferred from 18S rDNA sequences

Molecular Phylogenetics and Evolution ◽

10.1016/j.ympev.2005.11.025 ◽

2006 ◽

Vol 40 (1) ◽

pp. 8-19 ◽

Cited By ~ 47

Author(s):

Shin-ichi Yokobori ◽

Atsushi Kurabayashi ◽

Brett A. Neilan ◽

Tadashi Maruyama ◽

Euichi Hirose

Keyword(s):

Molecular Phylogeny ◽

18S Rdna ◽

Rdna Sequences ◽

Multiple Origins ◽

18S Rdna Sequences ◽

Colonial Ascidians

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

Zootaxa ◽

10.11646/zootaxa.4758.3.8 ◽

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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Phylogenetic relationships of the family Sphaeromatidae Latreille, 1825 (Crustacea: Peracarida: Isopoda) within Sphaeromatidea based on 18S-rDNA molecular data

Zootaxa ◽

10.11646/zootaxa.3599.2.3 ◽

2013 ◽

Vol 3599 (2) ◽

pp. 161-177 ◽

Cited By ~ 13

Author(s):

REGINA WETZER ◽

MARCOS PÉREZ-LOSADA ◽

NIEL L. BRUCE

Keyword(s):

Phylogenetic Relationships ◽

18S Rdna ◽

Molecular Data ◽

Sister Taxon ◽

Taxon Sampling ◽

Rdna Sequences ◽

The Family ◽

History Of ◽

18S Rdna Sequences

Based on 18S-rDNA sequences of 97 isopods including 18 Sphaeromatidea, we show Sphaeromatidae, Valvifera, Serolidae, and Ancinidae is a well supported clade. The within clade relationships of these taxa are not as definitively demonstrated because taxon sampling for some groups is still limited. In our analyses the Sphaeromatidae are shown to be unequivocally monophyletic. This is contrary to the morphology-based analysis by A. Brandt and G. Poore in 2003, which included only five Sphaeromatidae and found the family to be paraphyletic. The Ancinidae are also upheld, and the Valvifera is the sister taxon to Serolidae. Surprisingly Plakarthrium (Plakarthiidae) is nested within the Sphaeromatidae in most analyses. We point out short-comings in our sampling and suggest areas which would benefit from better sampling. We also review the long and convoluted nomenclatural history of the Sphaeromatidea, Sphaeromatoidea, and Sphaeromatidae.

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