Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 19 de 19
Filtrar
1.
Syst Parasitol ; 100(5): 455-471, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37249817

RESUMO

Oncoceratium n. gen. is proposed to accommodate Oncoceratium amphidactylum n. gen. n. sp. (Monogenoidea, Gyrodactylidae). Although the proposed genus is monotypic, the differences presented in the diagnosis clearly establish it as distinct from species from other genera, such as Gyrodactylus von Nordmann, 1832 and especially those that occur exclusively in the Neotropical region. The new genus is diagnosed by the presence of a bulbous male copulatory organ, with one row of spinelets of similar sizes and shapes, while the only spine usually found in the gyrodactylids is absent or not differentiated; a haptor with anchors presenting points folded outwards, and superficial and deep roots continuous and indistinguishable; the absence of a deep bar; and hooks in two bilateral clusters of eight hooks. Oncoceratium amphidactylum n. gen. n. sp. is described from the tamboatá fish, Hoplosternum littorale (Hancock) (Callichthyidae), and is characterized by the presence of a pair of horn-shaped anchors with the point turned outwards, a superficial bar shield and absent deep bar, hooks disposed in bilateral lobes, and a MCO with no spine or with a row with large spinelets visible in place of the spine. In addition to the morphological features, distance analysis and Bayesian inference, based on 5.8s and partial ITS2, support placing the new species in a new genus, and not including it in a cluster of species of Gyrodactylus and near to Gyrodactyloides bychowskii Albova, 1948, Ieredactylus rivuli Schelkle et al., 2011 and Laminiscus gussevi (Bychowsky & Polyansky, 1953) Pálsson & Beverely-Burton, 1983.


Assuntos
Peixes-Gato , Doenças dos Peixes , Trematódeos , Infecções por Trematódeos , Masculino , Animais , Brasil , Teorema de Bayes , Especificidade da Espécie
2.
Parasitol Res ; 120(1): 27-36, 2021 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-33103215

RESUMO

The present study describes Henneguya tietensis n. sp. parasitizing Prochilodus lineatus (Valenciennes, 1837) from Brazil, through morphological and molecular analysis. Myxospores were found in the gill tissue of P. lineatus with a prevalence of 10%. The myxospores consisted of two elongate, elliptical shell valves each with a long, tapering caudal appendage. The morphology was consistent with Henneguya and the myxospore measured as follows (mean ± SD): total length 55.5 ± 2.1 µm, body length 16.2 ± 1.1 µm, body width 5.5 ± 0.1 µm, caudal appendages length 39.0 ± 2.0 µm. The polar capsules were 7.3 ± 0.2 µm long, 1.7 ± 0.2 µm wide and contained a polar filament coiled 11 to 13 turns. Histological analysis showed the plasmodia developing in the middle region of each gill filament and caused a focally extensive distension by forming a space-occupying mass within the gill filament. The ultrastructural analysis allowed the observation of the presence of mature myxospores throughout the plasmodium. Phylogenetic analysis with the SSU rDNA gene showed Henneguya tietensis n. sp. as a sister species of the subclade formed by Henneguya piaractus and Henneguya brachypomus that infect fishes of the genus Piaractus. The genetically closest species was H. piaractus, which showed a similarity of 82.4%. Using molecular and morphological characterization, the myxozoan parasite described herein represents a new species of the genus Henneguya.


Assuntos
Caraciformes/parasitologia , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Myxozoa/genética , Doenças Parasitárias em Animais/parasitologia , Animais , Brasil/epidemiologia , DNA Ribossômico/genética , Doenças dos Peixes/epidemiologia , Myxozoa/classificação , Myxozoa/isolamento & purificação , Doenças Parasitárias em Animais/epidemiologia , Filogenia
3.
Parasitol Res ; 119(12): 4259-4265, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32901342

RESUMO

The present study describes Henneguya lacustris n. sp. parasitizing Astyanax lacustris (Lütken 1875), from the Tietê River, State of São Paulo, Brazil, through morphological and molecular analysis. Myxospores of the parasites were found in the gills of A. lacustris with 13% prevalence of infection. The myxospores were oval and presented as measures (mean ± standard deviation): total length 18.3 ± 2.2 µm, body length 10.4 ± 1.6 µm, body width 4.9 ± 0.9 µm, tail length 7.2 ± 2.5 µm. The polar capsule was 4.8 ± 0.3 µm long and 1.5 ± 0.2 µm wide. The polar tubules, present inside the polar capsules, had 6 to 7 turns. The ultrastructural analysis allowed the observation of the asynchronous development of the myxospores. Phylogenetic analysis showed H. lacustris n. sp. as a sister species of H. chydadea Barassa and Cordeiro 2003 in a subclade formed by species that parasitize the gills of Characiform fish from Brazil. Using molecular and morphological characterization, this parasite was identified as a new species of the genus Henneguya Thélohan 1892.


Assuntos
Characidae/parasitologia , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Myxozoa/classificação , Doenças Parasitárias em Animais/parasitologia , Animais , Brasil/epidemiologia , Doenças dos Peixes/epidemiologia , Myxozoa/genética , Myxozoa/crescimento & desenvolvimento , Myxozoa/ultraestrutura , Doenças Parasitárias em Animais/epidemiologia , Filogenia , Prevalência , Rios/parasitologia
4.
Parasitol Res ; 119(6): 1981-1988, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32377909

RESUMO

Among several marine pelagic species of the Brazilian coast, Scomber colias Gmelin, 1789 (Perciformes: Scombridae) stands out for having great economic importance, since it is widely used as a food resource and presents moderate vulnerability. Twenty specimens of S. colias were purchased from October 2015 to October 2016 from the coast of Santa Catarina, Brazil. In the present study, we recorded Hysterothylacium fabri (Rudolphi, 1819) (Deardorff and Overstreet, Proc Biol Soc Wash 93(4):1035-1079 1980) from the S. colias intestine using an integrative taxonomy approach, where morphological data are used in combination with partial sequences of the ITS gene, to validate the taxonomic status of the species and establish their relationships with other members of the genus. This species is being recorded for the first time in the South Atlantic and S. colias. The specimens of H. fabri collected in this study parasitizing S. colias presented morphology similar to the other specimens already registered parasitizing other hosts. The distance matrix generated showed that the partial sequences obtained in this study were more similar to sequences of Hysterothylacium sp. collected in China. In phylogenetic analysis, the two detected haplotypes of this study were grouped with H. fabri haplotypes deposited in GenBank in a monophyletic subclade.


Assuntos
Ascaridoidea/isolamento & purificação , Perciformes/parasitologia , Animais , Ascaridoidea/classificação , Ascaridoidea/ultraestrutura , Oceano Atlântico , Perciformes/classificação , Filogenia
5.
Parasitol Res ; 118(12): 3327-3336, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31728724

RESUMO

On the basis of morphological and molecular analyses, a new myxozoan parasite is described from the gills of the fish Hoplerythrinus unitaeniatus, collected in the municipality of Nova Xavantina, Mato Grosso State, Brazil. Plasmodia of Henneguya unitaeniata sp. nov. were oval and whitish and were found surrounded by collagen fibers forming plasmodia wall between gill filaments on the gill arch. The spores were ellipsoidal with two similar polar capsules. Morphometric analysis showed a total spore mean length of 23.8 ± 1.5 µm, spore body mean length of 14.5 ± 0.7 µm, caudal appendage mean length of 10.3 ± 1.4 µm, thickness mean length of 4.3 ± 0.3 µm, polar capsule mean length of 4.2 ± 0.5 µm, polar capsule mean width of 1.8 ± 0.3 µm, spore mean width of 4.8 ± 0.4 µm, and 4-5 polar filament coils. Phylogenetic analysis showed Henneguya unitaeniata sp. nov. as a basal species in a subclade formed by myxozoans that parasitize bryconid fishes.


Assuntos
Caraciformes/parasitologia , Brânquias/parasitologia , Myxozoa/classificação , Myxozoa/crescimento & desenvolvimento , Filogenia , Animais , Brasil , Estágios do Ciclo de Vida , Myxozoa/citologia , Myxozoa/genética , Especificidade da Espécie
6.
Parasitol Res ; 118(7): 2169-2182, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31183598

RESUMO

The Diplostomidae include a large group of flatworms with complex life cycles and are frequently found parasitizing the eyes and central nervous system of freshwater fishes. The morphological identification of the metacercariae at species level is not always possible. Thus, molecular tools have become essential to assist in the parasite species determination. This study was aimed at describing two diplostomid metacercariae found in freshwater fish in São Paulo, Brazil, based on morphological characters and in the genetic characterization of COI sequences. Our results showed that the two recognized taxa (Tylodelphys sp. and Diplostomidae gen. sp.) appear to be different from the species already described in South America. Tylodelphys sp. differs morphologically from Tylodelphys xenopi, T. mashonense, T. jenynsiae, and T. scheuringi. The metacercariae of T. clavata and T. conifera are smaller than Tylodelphys sp., while T. podicipina is larger than the metacercariae described here. The phylogenetic analysis of COI sequences yielded Tylodelphys sp. as the sister species of Tylodelphys sp. 4, a species reported from the brain of the eleotrid Gobiomorus maculatus in Oaxaca, Mexico. The metacercariae identified as Diplostomidae gen. sp. are morphologically different from the known diplostomid metacercariae and did not match with other diplostomid sequences available. Diplostomidae gen. sp. is recovered as the sister species of Diplostomum ardeae. Although the morphological evidence and the COI sequences differentiate the metacercariae found, the absence of adult specimens of both species precludes the specific designation. This is one of the first papers that use an integrative taxonomy approach to describe the species diversity of diplostomid trematodes in Brazil.


Assuntos
Doenças dos Peixes/parasitologia , Metacercárias/classificação , Trematódeos/classificação , Infecções por Trematódeos/veterinária , Animais , Brasil , Peixes/parasitologia , Água Doce , Estágios do Ciclo de Vida , Metacercárias/genética , México , Filogenia , Rios/parasitologia , Trematódeos/genética , Trematódeos/isolamento & purificação , Infecções por Trematódeos/parasitologia
7.
Syst Parasitol ; 95(2-3): 309-318, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29392592

RESUMO

A new species of myxozoan, Myxobolus imparfinis n. sp. is described based on material from the gills of Imparfinis mirini (Haseman) (Heptapteridae). Mature myxospores are round, measuring 7.1-8.4 (7.9 ± 0.3) µm in length, 4.5-6.2 (5.5 ± 0.5) µm in width and 3.1-4.2 (3.7 ± 0.3) µm in thickness. The polar capsules are of unequal size, the larger polar capsule measuring 3.4-4.5 (3.9 ± 0.3) µm in length and 1.4-2.0 (1.7 ± 0.1) µm in width and the smaller capsule measuring 3.1-3.8 (3.4 ± 0.2) µm in length and 1.2-1.8 (1.5 ± 0.2) µm in width. The polar filament presents 6-7 coils. Spores had a prevalence of infection of 75% (6/8). In histological analyses we detected the development site of spores in primary filaments, in afferent branchial artery, thus classifying the type of infection to the filamental type and vascular subtype. The phylogenetic analyses of a dataset including species Myxobolus Bütschli, 1882 and Henneguya Thélohan, 1892 from South America recovered M. imparfinis n. sp. as a sister species of Myxobolus flavus Carriero, Adriano, Silva, Ceccarelli & Maia, 2013. To our knowledge, this is the first record of a myxozoan species parasitising I. mirini.


Assuntos
Peixes-Gato/parasitologia , Myxobolus/classificação , Myxobolus/citologia , Filogenia , Animais , Brasil/epidemiologia , Doenças dos Peixes/epidemiologia , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Doenças Parasitárias em Animais/epidemiologia , Doenças Parasitárias em Animais/parasitologia , Especificidade da Espécie
8.
Parasitol Res ; 116(12): 3303-3313, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29032498

RESUMO

Plasmodia containing myxospores belonging to the genus Myxobolus Bütschli, 1882 were found in the ovaries and liver of Salminus hilarii. Despite its economic value, this fish host has no previous reports of myxozoan infections. Herein, we describe Myxobolus batalhensis n. sp. using morphological and ultrastructural data, as well as histological and SSU rDNA molecular data. The mature myxospores were elongated, measuring in average 15.2 ± 0.8 µm in length, 8.4 ± 0.4 µm in width, and 5.1 ± 0.2 µm in thickness. Polar capsules were elongated and measured 5.3 ± 0.3 µm in length and 2.8 ± 0.3 µm in width. Polar filaments had 6-9 coils. Histopathological analysis showed coagulation necrosis associated with cell lysis as a response of the host cell to the parasite in the ovaries. No inflammatory reaction was observed in the liver, although the presence of the plasmodia caused changes in tissue structure. The phylogenetic analysis of South American myxobolid species showed M. batalhensis n. sp. as sister species of Myxobolus aureus. This is the first report of a myxozoan species parasitizing S. hilarii and the first myxozoan species described in the Batalha river.


Assuntos
Caraciformes/parasitologia , Doenças dos Peixes/parasitologia , Myxobolus/classificação , Doenças Parasitárias em Animais/parasitologia , Animais , Brasil , DNA Ribossômico , Feminino , Fígado/parasitologia , Masculino , Myxobolus/anatomia & histologia , Ovário/parasitologia , Filogenia , Rios
9.
Parasitol Res ; 112(10): 3601-5, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23907634

RESUMO

A new species of Myxosporea, Henneguya nagelii n. sp., is described parasitizing the gills of Cyphocharax nagelii collected from Peixe's River, São Paulo State, Brazil. Among the fish examined, 16.7% had gills parasitized by myxosporeans. The plasmodia were white, round, or oval and measured 150-250 µm. The mature spores were fusiform and had smooth wall. The spores measurements were the following: total length, 34.5 ± 4.2 (26.4-39.9) µm; body length, 12.0 ± 0.5 (11.2-11.9) µm; body width, 4.9 ± 0.3 (4.4-5.5) µm; and caudal process length, 22.4 ± 4.0 (14.7-27.3) µm. The polar capsules were elongated and of unequal size, with lengths of 4.9 ± 0.4 (4.0-5.9) µm and 5.2 ± 0.4 (4.6-6.0) µm for the longest and shortest axes, respectively. Capsule width was 1.8 ± 0.2 (1.5-2.2) µm. Each capsule contained a polar filament with six to eight turns. There was no mucous envelope or iodinophilous vacuole. Morphometric differences between this parasite and other species of the genus Henneguya indicated that the parasite observed in C. nagelii is a new species. This is the first species of Myxosporea described in Peixe's River.


Assuntos
Caraciformes , Doenças dos Peixes/parasitologia , Myxozoa/classificação , Rios , Animais , Brasil/epidemiologia , Doenças dos Peixes/epidemiologia , Brânquias/parasitologia , Myxozoa/anatomia & histologia
10.
J Trace Elem Med Biol ; 78: 127185, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37163817

RESUMO

BACKGROUND: Fish are an important source of nutrition for humans. Artisanal fishing plays a fundamental role in Brazil fish production. In Brazil, the unrestrained increase, diffusion, and little importance for environmental causes of other economic activities, such as the agricultural industry, has caused irreparable damage, leading to the contamination of water bodies. Among the countless pollutants that reach water bodies, trace metals are extremely problematic. Here, we evaluated the bioaccumulation and health risk of trace metal contamination in the musculature of the trahira fish (Hoplias malabaricus), collected from two rivers in southeastern Brazil. METHODS: During the period from May 2017 to November 2019, 90 fish were collected, 45 from each river. River water samples were also taken during the same collection periods. From fish, muscle tissue samples were taken, and together with river water samples, analyzed for the recovery of trace metals (Al, Cr, Mn, Fe, Ni, Cu, As, Cd, and Pb) through the technique of Inductively Coupled Plasma Mass Spectrometry (ICP-MS). RESULTS: In general, fish as well as the waters of the Jacaré-Guaçú River had higher concentrations of metals. The elements Al, Cr and Cd stood out from the others analyzed metals for having a hazard index (HQ) above 1 (Al), for being up to 10 times above the concentrations allowed by Brazilian legislation (Cr) and for having a high bioconcentration factor (Cd), indicating a biomagnification process through the food chain. CONCLUSION: In general, trace metal concentrations in the waters and fish of the Jacaré-Guaçú were higher than in the Jacaré-Pepira, which shows that the Jacaré-Guaçú is the one that suffers more anthropogenic action between the two rivers. In addition, some elements such as Al, Cr and Cd, due to its high concentrations, should receive some attention as they can pose risks to the health of fish, which can jeopardize the survival of their populations, and especially to humans who use these animals as a food source.


Assuntos
Metais Pesados , Oligoelementos , Poluentes Químicos da Água , Humanos , Animais , Rios/química , Metais Pesados/análise , Bioacumulação , Monitoramento Ambiental/métodos , Brasil , Cádmio/análise , Poluentes Químicos da Água/análise , Medição de Risco , Oligoelementos/análise , Água
11.
Mar Pollut Bull ; 194(Pt B): 115374, 2023 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-37552925

RESUMO

Here, in an estuarine canal in southeast Brazil, we evaluated the potential for trace metal accumulation of the acanthocephalan parasite Floridosentis mugilis, which infects the fish host Mugil curema. The quantities of the trace metals were quantified using Inductively Coupled Plasma Mass Spectrometry (ICP-MS), which was used to analyze samples of the fish's muscle, intestine, and liver as well as the parasites. The parasites and the host's tissues had significantly different trace metal concentrations, according to our data. Furthermore, some metals have quite high bioconcentration factors, including Al, Cr, Ni, and Cd. We also found that the trace metal concentrations in the parasites were impacted by the sizes of the parasitic infrapopulations, with smaller infrapopulations tending to accumulate more metals. This study shows this acanthocephalan species' effective ability to store metals and is the first to investigate metal accumulation using it as a model.


Assuntos
Acantocéfalos , Metais Pesados , Parasitos , Smegmamorpha , Poluentes Químicos da Água , Animais , Brasil , Monitoramento Ambiental/métodos , Poluentes Químicos da Água/análise , Acantocéfalos/química , Metais/análise , Metais Pesados/análise
12.
Acta Parasitol ; 67(1): 233-243, 2022 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-34273054

RESUMO

PURPOSE: We describe two new Henneguya spp. (Myxobolidae) found parasitizing Cyphocharax modestus from Pardo river, Paraná river basin, municipality of Botucatu, São Paulo State, Brazil: Henneguya fastigata n. sp. from gill lamellae and Henneguya pardensis n. sp. from gill arches. We based the descriptions on myxospore morphology, histology, and small subunit ribosomal DNA sequences. METHODS: In this investigation, 50 specimens of Cyphocharax modestus were examined between July and December 2020 for myxozoan infections. Morphological characterization was based on the mature myxospores. The small subunit ribosomal DNA sequences were used for molecular and phylogenetic study. RESULTS: Phylogenetic analysis provided the evolutionary position of these new species with other myxobolids species. Myxospores of the two species had similar morphology and morphometrics, but differed in spore body width and length, and ssrDNA sequences differed by 7.2%. These data supported the diagnosis of the parasites as distinct and novel species. The phylogenetic analysis showed a well-supported subclade formed by species that parasitize curimatid fishes, with Henneguya gilbert as a sister species of Henneguya fastigata n. sp., and Henneguya pardensis n. sp. as a sister species of both species. CONCLUSION: Our analysis was consistent with previous studies suggesting that orders and families of the hosts are strongly correlated with phylogenetic signals in the Myxobolidae. These are the first species of myxozoans described in the Pardo river.


Assuntos
Caraciformes , Cnidários , Doenças dos Peixes , Myxozoa , Doenças Parasitárias em Animais , Animais , Brasil , Caraciformes/parasitologia , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Myxozoa/genética , Doenças Parasitárias em Animais/parasitologia , Filogenia
13.
Acta Parasitol ; 67(3): 1206-1216, 2022 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-35593955

RESUMO

PURPOSE: We describe two new species of Myxobolus (Myxobolidae) found parasitizing Mugil curema from two locations in Brazil: Myxobolus curemae n. sp. from gill arch and rays and Myxobolus maceioensis n. sp. from gill lamellae. METHODS: We based the descriptions on myxospore morphology, histology, and small-subunit ribosomal DNA sequences. RESULTS: Myxospores of the two new species had similar morphology and morphometry but differed in spore body width and length, and ssrDNA sequences differed by 10.5%. These data supported the diagnosis of the parasites as distinct and novel species. The phylogenetic analysis showed a subclade formed by species that parasitize Mugiliformes, with M. maceioensis n. sp. as a sister species of Myxobolus episquamalis and Myxobolus bizerti, while there is a group of six species that are sister related to M. curemae n. sp. Our analysis was consistent with previous studies suggesting that orders of the hosts are strongly correlated with phylogenetic signals in the Myxobolidae. CONCLUSIONS: Myxobolus curemae n. sp. and M. maceioensis n. sp. are new species identified parasitizing M. curema.


Assuntos
Cnidários , Doenças dos Peixes , Myxobolus , Myxozoa , Doenças Parasitárias em Animais , Smegmamorpha , Animais , Brasil , Doenças dos Peixes/epidemiologia , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Myxobolus/genética , Doenças Parasitárias em Animais/parasitologia , Filogenia
14.
Parasitol Int ; 86: 102445, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-34481082

RESUMO

The present study describes Hoferellus jutubensis n. sp., a myxozoan parasite found in the urinary bladder of the driftwood catfish Ageneiosus inermis, captured on Jutuba Island in the state of Pará, northern Brazil. A total of 30 A. inermis specimens were examined, of which 26 (86.7%) had myxospores and polysporic plasmodia of varying shapes and sizes dispersed in the lumen of the urinary bladder, either floating freely or attached to the epithelium. In the apical view, the myxospores of Hoferellus jutubensis n. sp. are rounded, 6.1 ± 0.2 (5.7-6.3) µm long and 5.5 ± 0.3 (5.2-6.0) µm wide, with two sub-spherical polar capsules, equal in size and shape, 2.5 ± 0.2 (2.3-2.7) µm long and 1.7 ± 0.2 (1.4-2.2) µm wide. The phylogenetic analysis of a partial sequence of the SSU rDNA gene, indicated that the new species is the sister taxon of Hoferellus azevedoi, with these two species forming a Brazilian lineage of Hoferellus. The comparison of the morphological and molecular data with those of the existing members of the genus confirmed the species status of Hoferellus jutubensis n. sp., which adds one further Hoferellus taxon to the known myxosporean diversity of the Amazon basin.


Assuntos
Peixes-Gato , Doenças dos Peixes/parasitologia , Interações Hospedeiro-Parasita , Myxozoa/classificação , Animais , Brasil , Myxozoa/anatomia & histologia , Myxozoa/genética , Myxozoa/fisiologia
15.
Parasitol Int ; 80: 102184, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32898661

RESUMO

Plasmodia containing myxospores belonging to the genus Henneguya Thélohan, 1892 were found in the gills of Eugerres brasilianus (Cuvier, 1830). Despite the economic importance, few parasitological studies have been done with this species. We describe Henneguya lagunensis n. sp. using morphological and molecular data. The mature myxospores were rounded, measuring 29.1 ± 2.2 µm in total length, 8.2 ± 1.0 µm in body length, 7.9 ± 0.2 µm in body width, 20.7 ± 2.4 µm in tail length and 4.8 ± 1.0 µm in thickness. The polar capsules measured 3.3 ± 0.4 in length and 1.7 ± 0.3 µm in width. Polar filaments had 4-5 turns, helical. Phylogenetic analysis showed Henneguya lagunensis n. sp. as a sister species of Henneguya cynoscioni Dyková, Buron, Roumillat and Fiala, 2011, within a clade that contained mostly Henneguya species that parasitize marine fish of the order Perciformes. This is the first report of a species of Henneguya parasitizing Eugerres brasilianus.


Assuntos
Doenças dos Peixes/parasitologia , Myxozoa/anatomia & histologia , Myxozoa/genética , Doenças Parasitárias em Animais/parasitologia , Perciformes , Animais , Brasil , DNA de Helmintos/análise , DNA Ribossômico/análise , Filogenia
16.
Parasitol Int ; 70: 27-32, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30711640

RESUMO

Henneguya guanduensis was originally described as a gill parasite of the Hoplosternum litoralle, a siluriform fish belonging to the Callichthyidae family. A study was undertaken with 58 specimens of H. litoralle taken from Batalha River in the state of São Paulo. The fish were collected and examined searching for lesions and/or myxosporean plasmodia. The prevalence of infection was 9.31% in the gills and 5.17% in the intestine. The mature spores had elongated bodies with polar capsules of inequal size and a caudal length greater than body length. Morphological characteristics identified the parasite as H. guanduensis. Molecular analysis of the SSU rDNA partials sequences resulted in a 1796 bp and 1712 bp for gills and intestine repectively, demonstrating significant genetic differences with previously described species of Henneguya and 99.7% similarity to each other when aligned. Phylogenetic analysis comparing the SSU rDNA sequence of H. guanduensis with closest species as indicated by BLASTn Max Score showed H. guanduensis as sister species of H. loretoensis in a subclade compose by species that parasites fishes from Amazon basin. This is the first report of the finding of Henneguya guanduensis spores in the intestine of Hoplosternum littorale.


Assuntos
Peixes-Gato/parasitologia , Doenças dos Peixes/parasitologia , Brânquias/parasitologia , Myxozoa/genética , Myxozoa/ultraestrutura , Animais , Brasil , DNA Ribossômico/genética , Intestinos/parasitologia , Microscopia , Microscopia Eletrônica de Transmissão , Myxozoa/isolamento & purificação , Filogenia , Rios , Esporos de Protozoários/ultraestrutura
17.
Acta Trop ; 197: 105053, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31173737

RESUMO

Plasmodia containing spores of a new species of myxozoan, Henneguya jundiai n. sp., were found in the gill arches of Rhamdia quelen catfish. The present study describes H. jundiai n. sp. based on morphological and molecular analysis. The mature spores were elongated and measured 26.9 ± 1.9 (22.9-29.2) µm in total spore length, 9.5 ± 0.4 (8.8-10.0) µm in spore body length, 4.6 ± 0.4 (4.1-5.5) µm in spore body width, 17.3 ± 1.8 (14.1-19.8) µm in tail length, 4.9 ± 0.3 (4.6-5.5) µm in polar capsule length and 1.4 ± 0.2 (1.2-1.7) µm in polar capsule width. The polar filaments had 6-7 coils. Histological analysis revealed the formation of a large plasmodium connected to the gill arch through the epithelial tissue. Ultrastructural analysis revealed the presence of a binucleated sporoplasm, as well as the polar capsules and the coils of the polar filament. Phylogenetic analysis found that H. jundiai n. sp. is located within a subclade formed by species of Henneguya which parasitize siluriform fish from Brazil. Henneguya jundiai n. sp. appears as a sister species of H. quelen. The results of the analyzes clearly indicated the existence of a new species, H. jundiai.


Assuntos
Peixes-Gato/parasitologia , Brânquias/parasitologia , Myxozoa/genética , Animais , Myxozoa/anatomia & histologia , Myxozoa/classificação , Filogenia
18.
Rev Bras Parasitol Vet ; 22(4): 611-5, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24473892

RESUMO

A total of 57 sairus (Cyphocharax nagelii) from the Peixe River, state of São Paulo, southeastern Brazil, were examined between April 2011 and February 2012. Eleven species of metazoan parasites were collected and identified: Palombitrema triangulum, Curvianchoratus hexacleidus, Curvianchoratus singularis, Sphincterodiplostomum musculosum, Contracaecum sp., Cacatuocotyle paranaensis, Cosmoxynemoides aguirrei, Amplexibranchius bryconis, Brasergasilus sp., Ergasilus sp. and Clinostomum sp. The monogenean P. triangulum was the most prevalent species (61.40%) with the highest mean intensity (4.88). The monogeneans C. hexacleidus and C. singularis, the digenean S. musculosum and the nematode Contracaecum sp. also showed high prevalence. Only S. musculosum presented significant correlation between the total body weight of the host and its abundance. The parasitic infracommunities had a mean Brillouin diversity (HB) of 1.165 ± 0.987 and the maximum diversity was 1.671. The sex and length of the hosts did not influence the abundance of any parasite species. The community of metazoans in C. nagelii from the Peixe River was characterized by high richness and low uniformity.


Assuntos
Biota , Caraciformes/parasitologia , Animais , Rios
19.
Rev Bras Parasitol Vet ; 21(3): 263-9, 2012.
Artigo em Inglês | MEDLINE | ID: mdl-23070437

RESUMO

An occurrence of the copepod Lamproglena monodi Capart, 1944, parasitizing freshwater fishes in Brazil is presented, along with new morphological data. This crustacean was originally described parasitizing several cichlids in Africa. In the present study, the crustaceans were collected from the body surface and gills of two fish species native to Brazil [Astronotus ocellatus (Agassiz, 1831) and Cichla ocellaris Bloch and Schneider, 1801] and two introduced species [Oreochromis niloticus (Linnaeus, 1758) and Tilapia rendalli (Boulenger, 1897)]. The Brazilian specimens exhibited some morphometric intraspecies differences in relation to the specimens from Congo-Kinshasa and Egypt.


Assuntos
Copépodes/fisiologia , Peixes/parasitologia , Animais , Brasil , Feminino , Água Doce , Masculino
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa