Thelastoma gueyei sp. n. (Nematoda: Thelastomatidae) from the Senegal diplopod Archispirostreptus tumuliporus (Diplopoda: Spirostreptidae)

Nematology ◽  
2006 ◽  
Vol 8 (5) ◽  
pp. 739-747 ◽  
Author(s):  
Božena Koubková ◽  
Vlastimil Baruš ◽  
Iveta Matějusová ◽  
Iveta Hodová ◽  
Petr Koubek
Keyword(s):  
Ribosomal Rna ◽  
Morphological Characteristics ◽  
Total Body Length ◽  
Small Subunit ◽  
Species Group ◽  
The Body ◽  
Pharyngeal Bulb ◽  
Genital Cone ◽  
Tail Spike ◽  
Total Body

Abstract Thelastoma gueyei sp. n., a nematode belonging to the long-tailed species group of the genusThelastoma, is described from the diplopodArchispirostreptus tumuliporus (Spirostreptidae) collected in Niokolo Koba National Park (Senegal, West Africa).Thelastoma gueyei sp. n. is morphologically most similar toT. gipetiti. Females are characterised by: the vulva being situated in the posterior half of the body and near to the anus (V′ = 75-86) with the anterior vulval lip developed into a prominent flap; excretory pore located at the level of the anterior end of the pharyngeal bulb; b′ = 28-38 and tail, expressed as a proportion of L′, = 1.7-2.7. Males have narrow cuticular alae extending from about the middle of the pharynx to the level of the anteriormost pair of copulatory papillae; four pairs of copulatory papillae, two large, subventral, pairs being located adcloacally on the genital cone, a third, much smaller pair on the posterior margin of the genital cone and the last pair being situated at the mid-point of the tail spike; and a tail occupying 10.8-13.2% of the total body length. The distal tip of the spicule is drop-shaped. Morphological characteristics were studied using scanning electron microscopy and a comparison of the long-tailed group of thelastomatids is provided. Nucleic acid sequence of the small subunit ribosomal RNA gene was obtained for purposes of DNA barcoding.

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.

scholarly journals Five Fungal Pathogens Are Responsible for Bayberry Twig Blight and Fungicides Were Screened for Disease Control

2020 ◽  
Vol 8 (5) ◽  
pp. 689 ◽  
Author(s):  
Wenjun Li ◽  
Ming Hu ◽  
Yang Xue ◽  
Zhijun Li ◽  
Yanfei Zhang ◽  
...  
Keyword(s):  
Ribosomal Rna ◽  
Fungal Pathogens ◽  
Large Subunit ◽  
Elongation Factor ◽  
Morphological Characteristics ◽  
Its Region ◽  
Small Subunit ◽  
Field Application ◽  
Financial Loss ◽  
Twig Blight

Bayberry (Myrica rubra) is a commercial fruit in China. For the past seven years, twig blight disease has been attacking bayberry plantations in Shantou City, Guangdong Province, China, leading to destructive damage and financial loss. In this study, five fungal species associated with twig dieback and stem blight were identified based on morphological characteristics combined with multilocus sequence analysis (MLSA) on the internal transcribed spacer (ITS) region, partial sequences of β-tubulin (tub2), translation elongation factor 1-α (tef1-α), large subunit ribosomal RNA (LSU) and small subunit ribosomal RNA (SSU) genes, which are Epicoccum sorghinum, Neofusicoccum parvum, Lasiodiplodia theobromae, Nigrospora oryzae and a Pestalotiopsis new species P. myricae. P. myricae is the chief pathogen in fields, based on its high isolation rate and fast disease progression after inoculation. To our knowledge, this is the first study reporting the above five fungi as the pathogens responsible for bayberry twig blight. Indoor screening of fungicides indicates that Prochloraz (copper salt) is the most promising fungicide for field application, followed by Pyraclostrobin, 15% Difenoconazole + 15% Propiconazole, Difenoconazole and Myclobutanil. Additionally, Bacillus velezensis strain 3–10 and zeamines from Dickeya zeae strain EC1 could be used as potential ecofriendly alternatives to control the disease.

Tylenchid entomoparasites isolated from Spondylis buprestoides (L.) and Asemum striatum (L.) (Coleoptera: Cerambycidae)

Nematology ◽  
2016 ◽  
Vol 18 (7) ◽  
pp. 775-780 ◽  
Author(s):  
Natsumi Kanzaki ◽  
Robin M. Giblin-Davis ◽  
Rafael Gonzalez ◽  
Yasiel Trujillo ◽  
Ann E. Hajek
Keyword(s):  
Ribosomal Rna ◽  
Morphological Analysis ◽  
Large Body ◽  
Small Subunit ◽  
The Body ◽  
Parasitic Nematodes ◽  
Beetle Species ◽  
Field Surveys ◽  
Phylogenetic Status ◽  
Longhorn Beetle

Tylenchid entomoparasites were isolated from two longhorn beetle species, Spondylis buprestoides from Tsukuba, Japan, and Asemum striatum from Ithaca, Tompkins County, NY, USA. Parasitic females and juveniles were obtained from S. buprestoides, where the female has a large body (5-6 mm long), clear stylet retracted into the body and degenerate anus and rectum, similar to some neotylenchids and allantonematids. By contrast, only stylet-bearing parasitic juveniles were found in eggs of A. striatum, and detailed morphological analysis was not done for this isolate. These two isolates of parasites were molecularly characterised, and analysed for their phylogenetic status based on the small subunit of the ribosomal RNA gene. The phylogenetic inference suggested that the two parasitic nematodes are close to each other, and to the siricidicola superspecies of the genus Deladenus, i.e., these two species and Deladenus form a well-supported clade. Because these two host beetle species belong to the same cerambycid subfamily (Spondylinae) from disparate locations, a subfamily-associated nematode parasite lineage may be revealed by further field surveys.

scholarly journals PENGUKURAN PANJANG TUBUH CACING NIPAH PENDEK Namalycastis abiuma (POLYCHAETA: NEREDIDAE) DARI PERAIRAN MANGROVE SUNGAI KAPUAS KALIMANTAN BARAT

2018 ◽  
Vol 11 (2) ◽  
pp. 183-189
Author(s):  
Junardi Junardi
Keyword(s):  
Body Weight ◽  
Body Size ◽  
Body Length ◽  
Anterior Segment ◽  
Total Body Length ◽  
The Body ◽  
Female Body Size ◽  
Alternative Approach ◽  
Total Body ◽  
The Relationship

AbstrakCacing Nipah Pendek Namalycastis abiuma memiliki tubuh yang elastis dan mudah putus sehingga diperlukan pendekatan morfometri tubuh lain untuk menentukan panjang tubuh sesungguhnya. Tujuan penelitian ini untuk menentukan panjang tubuh total cacing nipah pendek dengan menggunakan bobot tubuh, jumlah total segmen berseta, panjang tiga segmen anterior pertama (L3) dan lebar segmen berseta atau setiger ke-10 (S-10). Spesimen yang digunakan dipilih hanya individu yang lengkap dan utuh. Pengukuran dilakukan dibawah mikroskop dengan lensa okular yang dilengkapi dengan mikrometer. Data dianalisis dengan analisis korelasi. Cacing yang digunakan sebanyak 258 individu yang terdiri atas 190 immature, 54 submature dan 14 mature dengan ukuran panjang tubuh rata-rata berturut-turut 108,62±34,80 mm, 172,27±42,78 mm dan 123,14±57,40 mm. Cacing betina ditemukan memiliki ukuran tubuh lebih besar dari jantan. Panjang tubuh N. abiuma dapat diduga dengan bobot tubuh, panjang L3 dan lebar S-10 dengan nilai koefisien korelasi (r) berturut-turut 0,82, 0,73 dan 0,78. Pendekatan morfometri dapat digunakan untuk menentukan ukuran tubuh N. abiuma.Abstract The short nypa palm worm Namalycastis abiuma has an elastic and fragile body. Therefore, an alternative approach of morphometrical techniques is needed to determine the total body length. This research aimed to estimate the total body length of the short nypa palm worm based on body weight, the total number of segments, the length of the first three anterior segment (L3) and the tenth setiger width (S10). Body measurement was done using stereomicroscope fitted with the micrometer. Correlation analysis was done to describe the relationship between the length of L3 and the width of S10. A total of 258 complete and whole specimens consisted of 190 immature, 54 submature, and 14 mature individuals. The average body length of immature individuals was 108.62±34.80 mm, 172.27±42.78 mm for sub mature individuals, and 123.14±57.40 mm for mature individuals. Based on sexual dimorphism, the female body size is larger than male. The body length of N. abiuma can be estimated by body weight, the length of L3, and the  width of S10, with  correlation coefficient (r) of 0.82, 0.73 and 0.78, respectively. Morphometry approach can be used to determine the body size of N. abiuma. 

scholarly journals Length-weight relationship of European catfish (Silurus glanis L.) fry reared at different stocking densities under controlled conditions

2021 ◽  
pp. 47-51
Author(s):  
V. Krasteva ◽  
M. Yankova
Keyword(s):  
Body Length ◽  
Stocking Density ◽  
Total Body Length ◽  
The Body ◽  
Small Fish ◽  
Silurus Glanis ◽  
Group A ◽  
European Catfish ◽  
Total Body ◽  
Group B

Abstract. The present paper investigates the body length and weight, and the size-weight variations of one-month-old European catfish reared at 4 variants of stocking density: Variant 1 – 5 spec/l; Variant 2 – 10 spec/l; Variant 3 – 15 spec/l and Variant 4 – 28 spec/l. The experiment is carried out at the Institute of Fisheries and Aquaculture, Plovdiv for a period of 16 days, using a production system consisting of tubs with continuous water flow (0.7 l/min). At the end of the experiment, the fish from each variant are sorted in three size-weight groups: A – large, B – medium and C – small. The number of fish in each group is established. From the group of the medium- and small-sized fish, 150 speciments are measured, while from the group of the large specimens, which are the smallest in number, all specimens are measured for the biometric parameters body weight (BW, g) and total body length (TL, cm). The results from the study show small variations in the length and weight of the fish reared at the lowest stocking density (Variant 1). As the density increase, the size-weight differences between the specimens from Group A also increased, while of those from Group B they decrease. The number of the medium-sized fish decrease (p≤0.001) while the number of large specimens (p≤0.01) and small fish increase (p≤0.001).

scholarly journals Multi-Gene Phylogeny and Taxonomy of Hydnellum (Bankeraceae, Basidiomycota) from China

2021 ◽  
Vol 7 (10) ◽  
pp. 818
Author(s):  
Yan-Hong Mu ◽  
Jia-Rui Yu ◽  
Ting Cao ◽  
Xiang-Hua Wang ◽  
Hai-Sheng Yuan
Keyword(s):  
New Species ◽  
Rna Polymerase Ii ◽  
Ribosomal Rna ◽  
Phylogenetic Analyses ◽  
Large Subunit ◽  
Morphological Characteristics ◽  
Small Subunit ◽  
Phylogenetic Position ◽  
Ribosomal Rna Gene ◽  
Morphological Studies

The genus Hydnellum is an important group of stipitate hydnaceous fungi which can form ectomycorrhiza with many species of woody plants. In recent decades, the frequency and number of basidiocarps observed in China have been declining significantly. So far, however, we know little about the species diversity of Hydnellum in China. In this study, we conducted molecular phylogenetic analyses based on sections of multiple loci, including the large subunit of nuclear ribosomal RNA gene (nLSU), the internal transcribed spacer regions (ITS), the small subunit of nuclear ribosomal RNA gene (SSU) and the second-largest subunit of RNA polymerase II gene (RPB2), as well as morphological studies, of collected samples of Hydnellum from China. We also inferred Maximum Likelihood and Bayesian phylogenies for the order Thelephorales from the dataset of the combined nLSU and ITS. This study has revealed the phylogenetic position of Hydnellum in the order Thelephorales, and phylogenetically confirmed ten major clades in Thelephorales; Twenty-nine taxa are proposed, described or reported, including 10 new subgenera (Hydnellum subgenus Hydnellum, subg. Caesispinosum, subg. Croceum, subg. Inflatum, subg. Rhizomorphum, subg. Scabrosum, subg. Spongiosum, subg. Subindufibulatum, subg. Violaceum and subg. Zonatum), 11 new species (Hydnellum atrorubrum, H. atrospinosum, H. bomiense, H. brunneorubrum, H. fibulatum, H. granulosum, H. inflatum, H. rubidofuscum, H. squamulosum, H. sulcatum and H. yunnanense), 3 newly recorded species (H. caeruleum, H. peckii and H. spongiosipes) and 5 notable specimens (Hydnellum sp 1, H. sp 2, H. sp 3, H. sp 4 and H. sp 5). A classification system based on the morphological characteristics (especially the hyphal structure types) and molecular analyses is proposed to accommodate most species in Hydnellum. The distinguishing characters of the subgenera and the new species with their closely related taxa are discussed. A key to the species of Hydnellum from China is provided.

Swimming in needlefish (Belonidae): anguilliform locomotion with fins

2002 ◽  
Vol 205 (18) ◽  
pp. 2875-2884 ◽  
Author(s):  
James C. Liao
Keyword(s):  
Surface Waters ◽  
High Speed ◽  
Total Body Length ◽  
The Body ◽  
Pectoral Fins ◽  
Half Wavelength ◽  
Total Body ◽  
Length Analysis ◽  
Median Fins ◽  
Tail Beat

SUMMARYThe Atlantic needlefish (Strongylura marina) is a unique anguilliform swimmer in that it possesses prominent fins, lives in coastal surface-waters, and can propel itself across the surface of the water to escape predators. In a laboratory flow tank, steadily swimming needlefish perform a speed-dependent suite of behaviors while maintaining at least a half wavelength of undulation on the body at all times. To investigate the effects of discrete fins on anguilliform swimming, I used high-speed video to record body and fin kinematics at swimming speeds ranging from 0.25 to 2.0 Ls-1 (where L is the total body length). Analysis of axial kinematics indicates that needlefish are less efficient anguilliform swimmers than eels, indicated by their lower slip values. Body amplitudes increase with swimming speed, but unlike most fishes, tail-beat amplitude increases linearly and does not plateau at maximal swimming speeds. At 2.0 Ls-1, the propulsive wave shortens and decelerates as it travels posteriorly, owing to the prominence of the median fins in the caudal region of the body. Analyses of fin kinematics show that at 1.0 Ls-1 the dorsal and anal fins are slightly less than 180° out of phase with the body and approximately 225° out of phase with the caudal fin. Needlefish exhibit two gait transitions using their pectoral fins. At 0.25 L s-1, the pectoral fins oscillate but do not produce thrust, at 1.0 L s-1 they are held abducted from the body,forming a positive dihedral that may reduce rolling moments, and above 2.0 L s-1 they remain completely adducted.

scholarly journals A new xandarellid euarthropod from the Cambrian Chengjiang biota, Yunnan Province, China

2018 ◽  
Vol 156 (08) ◽  
pp. 1375-1384 ◽  
Author(s):  
Xianguang Hou ◽  
Mark Williams ◽  
Robert Sansom ◽  
Derek J. Siveter ◽  
David J. Siveter ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Body Length ◽  
Yunnan Province ◽  
Total Body Length ◽  
The Body ◽  
Mode Of Life ◽  
Chengjiang Biota ◽  
Total Body

AbstractThe euarthropod Luohuilinella deletres sp. nov. is described from rare material from the Chengjiang biota, Cambrian Series 2, Stage 3, of Yunnan Province, China. Phylogenetic analysis recovers a xandarellid affinity for L. deletres, representing only the fifth described species of this clade. L. deletres possesses a head shield that is about one-fifth of the total body length and a trunk with 30 tergites, the reduced anterior-most tergite and terminal three tergites lacking pleural elongations. Anteriorly situated notches in the head shield are associated with stalked eyes, in contrast to the more posterior, enclosed eye slits present in Xandarella. Posterior to the antennae there are at least 11 pairs of biramous appendages preserved, including three pairs in the head. The morphology of the midline gut of L. deletres, in which lateral, unbranched diverticula are wider towards the front of the body, is a characteristic also found in various trilobites. The dorsoventrally flattened exoskeleton suggests a benthic or nektobenthic mode of life for L. deletres, as for other trilobitomorphs, and it likely used its well-developed anteriorly positioned eyes for searching out food, either to scavenge or to find prey.

Two new species of philometrid nematodes (Nematoda: Philometridae) in Epinephelus coioides (Hamilton, 1822) from the South Bali Sea, Indonesia

Zootaxa ◽  
2013 ◽  
Vol 3609 (1) ◽  
pp. 49-59 ◽  
Author(s):  
KARTIKA DEWI ◽  
HARRY W. PALM
Keyword(s):  
New Species ◽  
Body Length ◽  
Total Body Length ◽  
Middle Part ◽  
The Body ◽  
Epinephelus Coioides ◽  
The South ◽  
Fish Family ◽  
Two New Species ◽  
Total Body

Based on light and scanning electron microscopy, two new species of philometrid nematodes, Spirophilometra endangae sp. nov. and Philometra epinepheli sp. nov. (Nematoda: Dracunculoidea: Philometridae) are described from Epinephelus coioides (Hamilton, 1822) (Perciformes: Serranidae) from the South Bali Sea, Indonesia. Spirophilometra endangae sp. nov. was isolated from the fins of E. coioides. The new species can be distinguished from the most closely related S. eichleri Parukhin, 1971 by a larger total body length and the site of infection in the host. The new species differs from S. centropomi (Caballero, 1974) also in the larger body size of the gravid females and the site of infection in the host. S. en-dangae sp. nov. differs from S. pacifica (Moravec, Santana-Pineros, Gonzales-Solis & Torres-Huerta, 2007) in the struc-ture and arrangement of the spines on the middle part of the body, the infection site of the worm, the type host and the zoogeographical host distribution. Philometra epinepheli sp. nov. differs from all other Philometra spp. congeners so far recorded from Ephinepelus groupers in the total body length and the site of infection. This is the first opercula-infecting species of Philometra described from the fish family Serranidae.

scholarly journals ‘Steady’ Swimming Kinematics of Tiger Musky, an Esociform Accelerator, and Rainbow Trout, a Generalist Cruiser

1988 ◽  
Vol 138 (1) ◽  
pp. 51-69 ◽  
Author(s):  
PAUL W. WEBB
Keyword(s):  
Rainbow Trout ◽  
Lateral Displacement ◽  
Phase Relationship ◽  
Total Body Length ◽  
The Body ◽  
Salmo Gairdneri ◽  
Trailing Edge ◽  
Drag Coefficients ◽  
Total Body ◽  
Tail Beat

Locomotor kinematics of tiger musky (Esox sp.) and rainbow trout (Salmo gairdneri) were measured at ‘steady’ swimming speeds of up to 85 cm s−1. Tail beat frequencies of musky were approximately 2 Hz higher than those of trout at any swimming speed, but tail beat amplitudes were 0.04L (where L is total body length) smaller. The product of these two variables was similar for the two species at any speed. The length of the propulsive wave was independent of speed, and was 0.8L for musky, somewhat smaller than the value for trout, 0.9L. The depth of the caudal fin trailing edge of trout was greater than that of musky, but the greater depth of the posteriorly located median fins of musky also contributed to thrust production. The cosine of the angle of the trailing edge to its beat plane showed the same phase relationship with lateral displacement in both musky and trout. It increased with speed for both species, and values for musky were slightly smaller. Thrust power requirements of musky and trout were similar. Thrust (= drag) coefficients of musky were 1.55 times larger than those for trout: this is roughly as expected on the basis of the larger proportion of the total area of musky located caudally and the higher drag coefficients in this region of the body. Lateral recoil movements of musky were unexpectedly smaller than for trout and were associated with smaller energy wastage from undamped recoil movements. The large recoil expected for the body form of musky was damped to some extent by higher tail beat frequencies, although this entailed some loss in Froude efficiency. Otherwise, no hydrodynamic explanation for the small recoil movements of musky was apparent. It is suggested that the myotomal muscles could be involved in minimizing recoil. The esociform morphology incurs costs in steady swimming, in comparison with generalist cruises, because of reduced sprint speeds for fish of a given length or increased power requirements for fish of a given mass.

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