scholarly journals Multiple evolutionary routes of the single polar capsule in Thelohanellus species (Myxozoa; Myxobolidae)

2019 ◽  
Vol 8 ◽  
pp. 56-62 ◽  
Author(s):  
Xiuping Zhang ◽  
Yang Liu ◽  
Christopher M. Whipps ◽  
Qingxiang Guo ◽  
Zemao Gu
Keyword(s):  
Polar Capsule

Myxobolus jialingensis n. sp. (Myxozoa: Myxobolidae) infecting urinary bladder and hepatopancreas of yellowhead catfish Tachysurus fulvidraco from China

Zootaxa ◽  
2020 ◽  
Vol 4819 (1) ◽  
pp. 179-186
Author(s):  
LEI GAO ◽  
JING ZHANG ◽  
CHENGZHONG YANG ◽  
YUANJUN ZHAO
Keyword(s):  
Urinary Bladder ◽  
18S Rdna ◽  
Polar Capsule ◽  
Small Subunit ◽  
Rdna Sequences ◽  
Multiple Origins ◽  
Close Phylogenetic Relationship ◽  
18S Rdna Sequences ◽  
Tachysurus Fulvidraco ◽  
Myxosporean Species

In the present study, we described a novel myxosporean species, Myxobolus jialingensis n. sp. (Myxozoa: Myxobolidae), which infected the urinary bladder and hepatopancreas of yellowhead catfish Tachysurus fulvidraco in China. The mature spores of M. jialingensis n. sp. were pyriform with the length of 15.8 ± 0.7 (15.4–17.0) μm and width of 8.0 ± 0.3 (7.8–8.9) μm. Two pyriform polar capsules were slightly unequal in size: the larger polar capsule was 7.4 ± 0.3 (6.7–8.0) μm in length and 3.1 ± 0.2 (2.8–3.6) μm in width; and the smaller polar capsule measured 7.3 ± 0.3 (6.6–8.1) μm in length and 3.3 ± 0.2 (2.9–3.6) μm in width. The polar capsules were directed toward the apex of the spore, packing seven to eight spirals of the polar filaments. The small subunit ribosomal RNA gene (18S rDNA) sequence of M. jialingensis n. sp. was unique among all myxozoans, and the highest similarity was 96.1% with M. voremkhai. Phylogenetic analysis based on 18S rDNA sequences revealed that myxosporeans infecting the close host affinity (belonging to the same order) had close phylogenetic relationship and, some myxosporeans infecting the same host order might have multiple origins.

Polar Capsule

2016 ◽  
pp. 2235-2235
Author(s):  
Heinz Mehlhorn
Keyword(s):  
Polar Capsule

Polar Capsule

2015 ◽  
pp. 1-2
Author(s):  
Heinz Mehlhorn
Keyword(s):  
Polar Capsule

Two new and one already known species of the genus Thelohanellus (Myxozoa: Myxosporea: Bivalvulida) parasitizing fresh water fishes in wetlands of Punjab, India

Biologia ◽  
2015 ◽  
Vol 70 (1) ◽  
Author(s):  
Ranjeet Singh ◽  
Harpreet Kaur
Keyword(s):  
Gall Bladder ◽  
Polar Capsule ◽  
Posterior Part ◽  
Body Cavity ◽  
Catla Catla ◽  
Caudal Fin ◽  
Spore Body ◽  
Wallago Attu ◽  
Gill Lamellae ◽  
Dark Blue

AbstractA study of parasites of freshwater fishes in Harike and Ropar wetlands of Punjab of India revealed the presence of two new and one already known myxozoan species belonging to the genus Thelohanellus Kudo, 1933 infecting gills and caudal fin of two carps and gall bladder of a catfish in the wetlands of Punjab, India. Plasmodia of the first species, T. lamelliformis sp. n. are found infecting primary gill lamellae of Catla catla (Hamilton, 1822) vern. thail, spores measure 10.27 × 4.9 μm, are elongate pyriform, tapering anteriorly in valvular view, having truncated anterior end and broad rounded posterior end. Shell valves are stained dark blue (with iron-haematoxylin) in the middle as well as in the posterior part of the spore body. Anteriorly, a prominent bent is present on one side of the shell valve. Polar capsule is broadly pyriform, measures 3.8 × 2.6 μm and is placed in the middle of spore body cavity with a distinct neck leading to the outside. Plasmodia of the second species, T. rohi sp. n. are found infecting caudal fin of Labeo rohita (Hamilton, 1822) vern. rohu, spores measure 14.5 × 7.7 μm, are elongately oval in valvular view having narrow, blunt anterior end with a prominent pore and broad rounded posterior end. A knob-like structure is present at the anterior end of the spore. Inner valve stains dark-blue (with iron-haematoxylin) in the middle and posterior part of the spore body. Polar capsule is oval to spherical in shape, measures 5.5 × 4.7 μm, is placed anteriorly and occupies nearly one third of the spore body cavity. Plasmodia of the third species, T. wallagoi Sarkar, 1985 infect primary gill lamellae of Wallago attu (Bloch & Schneider, 1807), spores measure 8.2 × 4.1 μm, are pyriform in valvular view, having bluntly pointed anterior end and rounded posterior end. Parietal folds are absent. Polar capsule is pyriform, measures 3.3 × 1.67 μm, is eccentrically placed with narrow pointed anterior end. Earlier, this species was reported from West Bengal infecting gall bladder of Wallago attu.

Description of a new species, Myxobilatus anteronippus sp. n., and synopsis of Indian species of the genus Myxobilatus Davis, 1944 (Myxozoa: Myxosporea: Bivalvulida)

2012 ◽  
Vol 62 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Saugata Basu ◽  
Biplob Kumar Modak ◽  
Durga P. Haldar
Keyword(s):  
New Species ◽  
Polar Capsule ◽  
Anterior Extremity ◽  
Present Species ◽  
Estuarine Fish ◽  
Indian Species ◽  
A New Species

A new histozoic species of the genus Myxobilatus Davis, 1944 (Myxozoa: Myxosporea: Bivalvulida), Myxobilatus anteronippus sp. n., is described from pectoral, dorsal and tail fins and operculum of an estuarine fish Taenioides cirratus (Blyth). The present species is unique in having polar capsules with unequal dimensions with a nipple or knob like structure present at the anterior extremity of each polar capsule, the shell valves are devoid of any striations. A synopsis of Indian species of the genus Myxobilatus Davis, 1944 including a total of six species is also provided.

scholarly journals Morphological and molecular characteristics of Kudoa scomberomori (Myxosporea: Kudoidae) firstly foundfrom the muscles of info-pacific king mackerel Scomberomorus guttatus in Quang Binh province, Vietnam

2017 ◽  
Vol 40 (1) ◽  
pp. 1-6
Author(s):  
Nguyen Ngoc Chinh ◽  
Ha Duy Ngo ◽  
Nguyen Huu Duc ◽  
Nguyen Thuy Linh ◽  
Pham Ngoc Doanh
Keyword(s):  
Muscle Fibre ◽  
Marine Fish ◽  
Polar Capsule ◽  
Molecular Characteristics ◽  
Thin Membrane ◽  
Shell Valve ◽  
New Host ◽  
Molecular Analyses ◽  
Flower Petal ◽  
King Mackerel

The genus Kudoa includes about 100 described species. In Vietnam, so far, only one species, Kudoa monodactyli, has been reported. During servey for parasites of marine fish in Quang Binh province, Vietnam in 2017, we found Myxozoan samples in 8 out of 15 Indo-Pacific king mackerel (Scomberomorus guttatus). They are identified as K. scomberomori based on the results of morphological and molecular analyses. A great number of individual spores form white pseudocysts with thin membrane within the muscle fibre. The pseudocysts were 0.1-0.3 × 0.4-0.7 mm. The shape of fresh spore like a flower petal. The spore of K. scomberomori was 6.65 ± 0.09 (6.53-6.76) µm in length, 7.42 ± 0.13 (7.29-7.58) µm in width and 6.55 ± 0.11 (6.40-6.65) µm in thickness. Each spore has six shell valves with same size. Each shell valve contained one polar capsule measuring 3.42 ± 0.09 (3.32-3.48) µm in length and 1.30 ± 0.14 (1.14-1.46) µm in width. This is the first report of K. scomberomori in Vietnam and Indo-Pacific king mackerel is recorded as a new host for this species.     Citation: Nguyen Ngoc Chinh, Ha Duy Ngo, Nguyen Huu Duc, Nguyen Thuy Linh, Pham Ngoc Doanh, 2017. Morphological and molecular characteristics of Kudoa scomberomori (Myxosporea: Kudoidae) firstly foundfrom the muscles of info-pacific king mackerel Scomberomorus guttatus in Quang Binh province, Vietnam. Tap chi Sinh hoc, 40(1): x-xx. DOI: 10.15625/0866-7160/v40n1.10671. *Corresponding author: [email protected] Received 13 September 2017, accepted 2 December 2017

scholarly journals A new Myxobolus (Cnidaria: Myxosporea) infecting the ornamental catfish Corydoras schwartzi from the Purus River in Brazil

2020 ◽  
Author(s):  
Patrick D. Mathews ◽  
Rafael R.M. Madrid ◽  
Omar Mertins ◽  
Vera L.S. Rigoni ◽  
André C. Morandini
Keyword(s):  
Polar Capsule ◽  
Body Shape ◽  
Histological Analysis ◽  
Polar Filament ◽  
Ornamental Fish ◽  
Homogeneous Material ◽  
Frontal View ◽  
First Report ◽  
Moderate Number ◽  
Cyst Development

A new microscopic cnidarian is described, infecting five of thirty (16.6%) specimens of Corydoras schwartzi caught in the Purus River, State of Amazonas, Brazil. Histological analysis showed that cyst development occurred in the serosa layer of the intestine. Mature myxospores are ovoid in body shape in frontal view, 22.4 ± 0.3 μm in total length and 16.3 ± 0.1 μm in width. Internally, two aubergine-shaped, elongate symmetrical polar capsules occupy more than half the length of the spore, 14.3 ± 0.2 μm in length and 6.5 ± 0.1 μm in width. Ultrastructural analysis provided evidence of five polar filament coils inside the polar capsule and binucleated sporoplasm containing a moderate number of sporoplasmosomes. The valvogenic cells abutting each other form a sutural ridge and frequently a thin layer of homogeneous material separates the cells. The outer surface of the myxospore valves is smooth, with no evidence of formation of ridges in the valves. Immature myxospores in various stages of development were observed. This study is the first report of a myxosporean parasitizing C. schwartzi and the first report of a myxosporean infection in the intestine of an ornamental fish from South America.

scholarly journals Myxobolus freitasi n. sp. (Myxozoa: Bivalvulida), a parasite of the brain of the electric knifefish in the Brazilian Amazon region

2021 ◽  
Vol 30 (1) ◽  
Author(s):  
José Ledamir Sindeaux-Neto ◽  
Michele Velasco ◽  
Diehgo Tuloza da Silva ◽  
Patrícia Matos ◽  
Marcelo Francisco da Silva ◽  
...  
Keyword(s):  
Nervous System ◽  
New Species ◽  
Polar Capsule ◽  
Brazilian Amazon ◽  
Morphological Data ◽  
Brazilian Amazon Region ◽  
Histological Processing ◽  
The Brain ◽  
Hematoxylin Eosin ◽  
A New Species

Abstract A total of 30 specimens of the Amazonian electric knifefish, Brachyhypopomus beebei Schultz, 1944 (Gymnotiformes: Hypopomidae), were collected from the Peixe-Boi River in the state of Pará, Brazil (1°06’59” S; 47°18’26” W). Fragments of the brain tissue were extracted for analysis via optical microscopy, and 18 specimens (60%) presented microparasites of the genus Myxobolus, with unequal capsules. The spores were 18.6 µm (17.7-19.8 µm) long and 8.6 µm (8.4-9.0 µm) wide; the largest polar capsule was 13.0 µm (12.4-13.4 µm) long and 5.6 µm (5.3-6.0 µm) wide, and the smallest capsule was 5.0 µm (4.5-5.3 µm) long and 2.5 µm (2.3-2.6 µm) wide. Infected brain fragments were extracted for histological processing and staining with hematoxylin-eosin and Ziehl-Neelsen. Some fragments were conserved in ethanol for molecular genetics analysis. A partial sequence of the 18S DNA gene was obtained from the spores, which did not correspond to any other sequences deposited in GenBank, although it did form a clade with other Myxobolus parasites of the nervous system. The morphological data, together with molecular phylogeny, supported the designation of a new species Myxobolus freitasi n. sp.

scholarly journals Myxobolus platanus n. sp. (Myxosporea, Myxobolidae), a parasite of Mugil platanus Günther, 1880 (Osteichthyes, Mugilidae) from Lagoa dos Patos, RS, Brazil

2007 ◽  
Vol 59 (4) ◽  
pp. 895-898 ◽  
Author(s):  
J.C. Eiras ◽  
P.C. Abreu ◽  
R. Robaldo ◽  
J. Pereira Júnior
Keyword(s):  
Polar Capsule ◽  
Posterior Extremity ◽  
Polar Filament ◽  
Lateral View ◽  
Frontal View ◽  
Iodinophilous Vacuole

Myxobolus platanus n. sp. infecting the spleen of Mugil platanus Günther, 1880 (Osteichthyes, Mugilidae) from Lagoa dos Patos, Brazil is described The parasites formed round or slightly oval whitish plasmodia (about 0.05-0.1mm in diameter) on the surface of the organ. The spores were round in frontal view and oval in lateral view, 10.7µm (10-11) long, 10.8µm (10-11) wide and 5µm thick, and presented four sutural marks along the sutural edge. The polar capsules, equal in size, were prominent, surpassing the mid-length of the spore, and were oval with the posterior extremity rounded, and converging with their anteriorly tapered ends. They were 7.7µm (7-8) long and 3.8µm (3.5-4) wide. A small intercapsular appendix was present. The polar filament formed five to six coils obliquely placed to the axis of the polar capsule. No mucous envelope or distinct iodinophilous vacuole were found.

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