Morphometrics and molecular analysis ofOzolaimus linstowin. sp. (Oxyuroidea: Pharyngodonidae) from the green lizardIguana iguana

2015 ◽  
Vol 90 (2) ◽  
pp. 186-198 ◽  
Author(s):  
S.V. Malysheva
Keyword(s):  
Body Size ◽  
Large Subunit ◽  
Buccal Capsule ◽  
Small Subunit ◽  
Present Species ◽  
Lsu Rdna ◽  
Adult Males ◽  
Spicule Length ◽  
Males And Females ◽  
Characteristic Features

AbstractOzolaimus linstowin. sp. is described from the large intestine ofIguana iguanaLinnaeus, 1758 from Mexico. The present species can be easily distinguished fromO. megatyphlonandO. cirratusby the presence of a long and slender pharynx not divided into sections, more similar to the remaining two species,O. monhysteraandO. ctenosauri. Ozolaimus linstowin. sp. can be differentiated fromO. monhysteraby the shorter spicule length and smaller body size of both males and females. Males ofO. linstowin. sp. are morphologically close to those ofO. ctenosauri, but females possess a markedly smaller body size and differ in the organization of the oral cuticular armature. Adult males ofO. linstowin. sp. bear some characteristic features of the J3 juvenile morphology in terms of the cuticular organization of the oral and buccal capsule. Phylogenetic analysis ofO.linstowin. sp. using partial small subunit (SSU) and D2–D3 large subunit (LSU) rDNA shows relationships with several Oxyuridae genera.

Observations on Malenchus geraerti n. sp. (Rhabditida: Tylenchidae), a morphological and molecular phylogenetic study

Zootaxa ◽  
2018 ◽  
Vol 4369 (3) ◽  
pp. 406 ◽  
Author(s):  
MAJID PEDRAM ◽  
MAHYA SOLEYMANZADEH ◽  
EBRAHIM POURJAM ◽  
MAHYAR MOBASSERI
Keyword(s):  
New Species ◽  
Large Subunit ◽  
Small Subunit ◽  
Phylogenetic Study ◽  
Molecular Characteristics ◽  
Lsu Rdna ◽  
Northern Iran ◽  
Lateral Field ◽  
Molecular Phylogenetic ◽  
Short Body

Malenchus geraerti n. sp., recovered from natural regions of northern Iran, is described and illustrated based on morphological, morphometric and molecular data. The new species is characterized by having females with a short body, an anteriorly wide S-shaped amphidial opening narrowing posteriorly, cuticle with prominent annuli, lateral field a plain band with smooth margins, muscular metacorpus with well-developed valve and corresponding plates, spermatheca filled with small spheroid sperm cells, vulva sunken in body with large epiptygma and no flap, and conical tail tapering gradually to a more or less pointed tip. Males of the new species are characterized by having a short body, tylenchoid spicules, adcloacal bursa with smooth margin and tail similar to that of the female. Morphologically, the new species is similar to five known species of the genus: M. fusiformis, M. machadoi, M. pachycephalus, M. solovjovae and M. undulatus. It most closely resembles M. pachycephalus, but as a cryptic species it can be differentiated using morphological and molecular characteristics. Comparisons with the four other aforementioned species are also discussed. Molecular phylogenetic studies using partial sequences of small and large subunit ribosomal DNA fragments reveal that the new species forms a clade with the species M. neosulcus in the small subunit (SSU) rDNA, and two species of Lelenchus in the large subunit (LSU) rDNA tree. 

New observations on Miculenchus Andrássy, 1959 (Nematoda: Tylenchidae) with descriptions of two new and one known species from Iran

Nematology ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 937-956 ◽  
Author(s):  
Yousef Panahandeh ◽  
Ebrahim Pourjam ◽  
Sergio Álvarez-Ortega ◽  
Farahnaz Jahanshahi Afshar ◽  
Majid Pedram
Keyword(s):  
New Species ◽  
Ribosomal Rna ◽  
Large Subunit ◽  
Small Subunit ◽  
Lsu Rdna ◽  
Natural Forests ◽  
Electron Microscopic ◽  
Pharyngeal Bulb ◽  
Ribosomal Rna Gene ◽  
Molecular Approaches

Summary During nematological surveys in grasslands and natural forests of north and north-western Iran, three species of Miculenchus, including two new and one known species, were recovered and characterised based upon morphological and molecular approaches. Miculenchus brevisalvus n. sp., the first new species, is mainly characterised by its short females 334-388 μm long and with a short 6.0-7.5 μm long stylet, pyriform to pyriform-elongate pharyngeal bulb, 4-8 μm long post-uterine sac (PUS), offset rounded spermatheca filled with small spheroid sperm, elongate conoid tail 62-83 μm long with a sharp tip, and males with simple cloacal lips. Miculenchus muscus n. sp., the second new species, is characterised by a combination of the following features: body 401-467 μm long, well-developed protuberant labial plate at the anterior end under light microscopy, stylet 7-9 μm long, pyriform pharyngeal bulb, PUS 4-9 μm long, gradually narrowing conical tail 62-74 μm long with a finely pointed or sharp end and bearing several fine bristles at tip, and a male with projecting cloacal lips. Both newly described species were morphologically compared with four currently known species of the genus, viz., M. elegans, M. salmae, M. salvus, and M. tesselatus. Miculenchus salmae was also recovered and reported from Iran for the first time. It is mainly characterised by lacking a PUS and the characteristic vagina shape. Miculenchus muscus n. sp. and M. salmae were both characterised using scanning electron microscopic images, yielding new morphological observations for the genus. All three species are studied for their molecular phylogenetic characters using sequences of near-full length fragments of the small subunit ribosomal RNA gene (SSU rDNA) and the D2-D3 expansion segments of the large subunit ribosomal RNA gene (LSU rDNA D2-D3). In both SSU and LSU phylogenies, all currently sequenced species of Miculenchus formed a monophyletic group with maximal clade support in both Bayesian inference and maximum likelihood analysis.

Discovery of a free-living nematode phylogenetically related to vertebrate parasites of the genus Strongyloides (Nematoda : Strongyloidoidea): morphological, anatomical and molecular characterisation

2016 ◽  
Vol 30 (4) ◽  
pp. 387
Author(s):  
Ren-E Huang ◽  
Runsheng Li ◽  
Zhongying Zhao
Keyword(s):  
Culture Media ◽  
Large Subunit ◽  
Molecular Genetic ◽  
Small Subunit ◽  
Land Snails ◽  
Rrna Genes ◽  
Lsu Rdna ◽  
Free Living ◽  
Rdna Sequences ◽  
Free Living Nematode

Nematodes are important, largely because they frequently act as parasites and threaten the health of plants, animals and even humans. Here, we describe an interesting free-living nematode from land snails on Luofu Mountain, Guangdong, China. Alloionema luofuensis, sp. nov. is phylogenetically related to slug-parasite A. appendiculatum and the well-known vertebrate parasites Strongyloides spp. based on small subunit (SSU) and the D2-D3 domain of large subunit (LSU) rDNA sequences. The new species possesses an extremely transparent body and is easily maintained using C. elegans culture media, suggesting a possible application prospect of this free-living nematode as a comparative model system for its related parasites. Morphology and anatomy of the gonochoristic A. luofuensis, sp. nov. adult were described and illustrated. The species is characterised by a filiform tail bisexually, ‘rhabditiform’ oesophagus and ‘rhabditid-like’ female anatomy, but its male caudal region is completely different from that of typical rhabditid nematodes, being absent from an enveloping bursa. It is the first marker taxon characterised morphologically as well as molecularly from the family Alloionematidae, a group of nematodes with hyperdiverse molecular genetic variations underlying highly conserved anatomy. Further molecular and genetic studies on A. luofuensis, sp. nov. populations hold promise to provide insight into evolution of the clade consisting of vertebrate parasites of the heterogonic nematode genus Strongyloides. This is because of its unusual high levels of heterozygosity maintained by the conserved rRNA genes of partial SSU and the D2-D3 domain of LSU for the type isolate of this species.

Phasmarhabditis hermaphrodita (Nematoda: Rhabditidae), a potential biocontrol agent isolated for the first time from invasive slugs in North America

Nematology ◽  
2014 ◽  
Vol 16 (10) ◽  
pp. 1129-1138 ◽  
Author(s):  
Irma Tandingan De Ley ◽  
Rory D. McDonnell ◽  
Sandy Lopez ◽  
Timothy D. Paine ◽  
Paul De Ley
Keyword(s):  
North America ◽  
Sequence Data ◽  
Control Strategies ◽  
Large Subunit ◽  
Small Subunit ◽  
Coi Gene ◽  
Lsu Rdna ◽  
Molecular Sequence Data ◽  
First Time ◽  
Phasmarhabditis Hermaphrodita

Phasmarhabditis hermaphroditais reported for the first time in North America from cadavers of the invasive slug speciesDeroceras reticulatum,D. laeveandLehmannia valentianacollected from three different locations in California, USA. Four isolates were identified using combined morphology, morphometrics and molecular sequence data for complete internal transcribed spacer (ITS-1, 5.8S, ITS-2), D2-D3 expansion segments of the large subunit (LSU or 28S) and nearly complete small subunit (SSU or 18S) ribosomal DNA. Extremely low sequence variations in the COI gene of the mitochondria were observed among US isolates as well as between US isolates and the two UK sequences. The occurrence ofP. hermaphroditain North America has regulatory implications for potential biological control strategies against non-native gastropod species that are pests in ornamental and agricultural cultivation on this continent. The D2-D3 sequence of the LSU rDNA is new for the species.

scholarly journals Isolation and Characterization of a Novel Facultative Anaerobic Filamentous Fungus from Japanese Rice Field Soil

2009 ◽  
Vol 2009 ◽  
pp. 1-9 ◽  
Author(s):  
Akio Tonouchi
Keyword(s):  
Filamentous Fungus ◽  
Rice Field ◽  
Large Subunit ◽  
Small Subunit ◽  
Lsu Rdna ◽  
Field Soil ◽  
Rice Field Soil ◽  
Rdna Sequences ◽  
Isolation And Characterization

A novel filamentous fungus strain designated RB-1 was isolated into pure culture from Japanese rice field soil through an anaerobic role tube technique. The strain is a mitosporic fungus that grows in both aerobic and strict anaerobic conditions using various mono-, di-, tri-, and polysaccharides with acetate and ethanol productions. The amount of acetate produced was higher than that of ethanol in both aerobic and anaerobic cultures. The characteristic verrucose or punctuate conidia of RB-1 closely resembled those of some strains of the genusThermomyces, a thermophilic or mesophilic anamorphic ascomycete. However, based on phylogenetic analysis with the small subunit (SSU) and large subunit (LSU) rDNA sequences, RB-1 was characterized as a member of the class Lecanoromycetes of the phylum Ascomycota. Currently, RB-1 is designated as an anamorphic ascomycete and is phylogenetically considered anincertae sediswithin the class Lecanoromycetes.

First taxonomic description of multivalvulidan myxosporean parasites from elasmobranchs: Kudoa hemiscylli n.sp. and Kudoa carcharhini n.sp. (Myxosporea: Multivalvulidae)

Parasitology ◽  
2010 ◽  
Vol 137 (13) ◽  
pp. 1885-1898 ◽  
Author(s):  
R. J. GLEESON ◽  
M. B. BENNETT ◽  
R. D. ADLARD
Keyword(s):  
Host Species ◽  
New Records ◽  
Phylogenetic Analyses ◽  
Large Subunit ◽  
Small Subunit ◽  
Lsu Rdna ◽  
Rdna Sequences ◽  
Taxonomic Description ◽  
Molecular Phylogenetic ◽  
Potential Impact

SUMMARYMyxosporean parasites are significant parasites of fishes not only for their apparent high diversity but also for their potential impact on fish health and/or marketability. Regardless, our knowledge of most myxosporeans, especially those found in elasmobranch hosts, is superficial. A study of multivalvulidan diversity in a range of elasmobranchs from Queensland, Western Australia and the Northern Territory (Australia) was conducted to address this knowledge gap. Specimens were collected from a total of 3 orders, 9 families and 31 species of elasmobranchs. Myxosporean infections referable to the genus Kudoa were discovered in host muscle and characterized morphologically and genetically. Both small subunit (SSU) and large subunit (LSU) rDNA sequences were used in molecular phylogenetic analyses. Kudoa spp. infected 27 of the 31 species of elasmobranchs examined, representing new records of this parasite genus in 26, of the 27, host species. Kudoids were observed in all 3 orders, and 7 out of the 9 families of elasmobranchs investigated. This paper reports the first 2 multivalvulidan species to be formally described from elasmobranchs, Kudoa hemiscylli n.sp. characterized from Hemiscyllium ocellatum (and 8 other host species) and Kudoa carcharhini n. sp. characterized from Carcharhinus cautus (and 2 other host species). Phylogenetic analyses revealed that kudoids from elasmobranchs form a separate lineage to those of teleosts, but are anchored within the overall kudoid clade.

A Re-Examination of Generic Concepts of Baeomycetoid Lichens Based on Phylogenetic Analyses of Nuclear ssu and Lsu Ribosomal Dna

1999 ◽  
Vol 31 (5) ◽  
pp. 409-418 ◽  
Author(s):  
Jamie L. Platt ◽  
Joseph W. Spatafora
Keyword(s):  
Ribosomal Dna ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
Large Subunit ◽  
Small Subunit ◽  
Lsu Rdna ◽  
Character State ◽  
Nucleotide Sequence Data ◽  
Lichen Symbiosis ◽  
Data Support

AbstractThe lichen symbiosis has evolved several times within the fungal kingdom, although the total number of lichenization events leading to extant taxa is still unclear. Two lichenized families, the Icmadophilaceae and Baeomycetaceae have been classified in the Helotiales. Because the Helotiales are predominantly nonlichenized, this suggests that these families represent independent evolutionary episodes of lichenization from the Lecanorales. As a first step towards understanding the evolution of the lichen symbiosis within this order, we tested recent hypotheses concerning the segregation of lichen genera between the two lichen families. Specifically, we used phylogenetic analyses of nucleotide sequence data from nuclear small-subunit and large-subunit ribosomal DNA to test the morphology-based hypotheses that Dibaeis is a distinct genus from Baeomyces and that Dibaeis is a member of the Icmadophilaceae rather than the Baeomycetaceae. Phylogenetic analyses of nuclear SSU rDNA and combined SSU and LSU rDNA data support the hypothesis that Dibaeis is more closely related to IcmadophUa than it is to Baeomyces. Therefore, these data support the resurrection of Dibaeis from its previous synonymy with Baeomyces based on the characters of ascocarp colour and ascus morphology. The recognition of two distinct genera is also consistent with character state distribution of unique lichen acids.

scholarly journals Candida funiuensi sp. nov., a cellobiose-fermenting yeast species isolated from rotten wood

2015 ◽  
Vol 65 (Pt_6) ◽  
pp. 1755-1758 ◽  
Author(s):  
Yun Wang ◽  
Yong-Cheng Ren ◽  
Zheng-Tian Zhang ◽  
Fu-Hua Wu ◽  
Tao Ke ◽  
...  
Keyword(s):  
Yeast Species ◽  
Large Subunit ◽  
Its Region ◽  
Small Subunit ◽  
Central China ◽  
Lsu Rdna ◽  
The Novel ◽  
Rotten Wood ◽  
Molecular Phylogenetic ◽  
Funiu Mountain

Two strains of an asexual cellobiose-fermenting yeast species were isolated from rotten wood samples collected in Funiu Mountain Nature Reserve in Henan Province, central China. Molecular phylogenetic analysis that included the nearly complete small subunit (SSU), the internal transcribed spacer (ITS) region and the D1/D2 domains of the large subunit (LSU) rDNA showed that these strains belonged to the Candida kruisii clade, with Candida kruisii and Candida cretensis as their closest phylogenetic neighbours. The nucleotide differences between the novel strains and the type strains of C. kruisii and C. cretensis were 30 and 36 substitutions, respectively, in the D1/D2 LSU rDNA, 40 and 44 substitutions, respectively, in the ITS region and 19 and 23 substitutions, respectively, in the SSU rDNA. The novel strains can also be distinguished from their closest described species, C. kruisii and C. cretensis, by a number of physiological characteristics, and represent a novel species of the genus Candida, for which the name Candida funiuensis sp. nov. is proposed. The type strain is NYNU 14625T ( = CICC 33050T = CBS 13911T). The Mycobank number is MB 811503.

Description of Ruehmaphelenchus formosanus n. sp. (Tylenchina: Aphelenchoididae) isolated from Euwallacea fornicates from Taiwan

Nematology ◽  
2013 ◽  
Vol 15 (8) ◽  
pp. 895-906 ◽  
Author(s):  
Natsumi Kanzaki ◽  
Hayato Masuya ◽  
Hisatomo Taki ◽  
Kimiko Okabe ◽  
Chi-Yu Chen
Keyword(s):  
New Species ◽  
Phylogenetic Tree ◽  
Ribosomal Rna ◽  
Large Subunit ◽  
Small Subunit ◽  
Ambrosia Beetle ◽  
Biodiversity Survey ◽  
Molecular Phylogenetic Tree ◽  
Molecular Phylogenetic ◽  
Males And Females

A Ruehmaphelenchus species was isolated from an ambrosia beetle, Euwallacea fornicates, during a biodiversity survey of entomophilic nematodes in Taichung, Taiwan. The new species is characterised by a unique tail morphology in both males and females, and a unique spicule morphology in males. The male spicule has clear dorsal and ventral limbs (connected by a blade-like cuticle), a triangular membrane-like structure on its sides, and short, conspicuous, laterally oriented, projections at the distal end. In a molecular phylogenetic tree, inferred from near-full-length small subunit (SSU: 18S) and D2/D3 expansion segments of the large subunit (LSU: 28S) of ribosomal RNA, the new species and other nominal and undescribed Ruehmaphelenchus species formed a well supported clade within Bursaphelenchus. Although this result supports a previous study that suggested that Ruehmaphelenchus is a junior synonym of Bursaphelenchus, the generic relationship between Ruehmaphelenchus and Bursaphelenchus remains somewhat uncertain. Therefore, R. formosanus n. sp. is described as a member of Ruehmaphelenchus, although this should be regarded as a tentative placement.

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