Publications by authors named "Luiz E R Tavares"

23 Publications

  • Page 1 of 1

New arrangement of three genera of fish tapeworms (Cestoda: Proteocephalidae) in catfishes (Siluriformes) from the Neotropical Region: taxonomic implications of molecular phylogenetic analyses.

Parasitol Res 2021 May 9;120(5):1593-1603. Epub 2021 Apr 9.

Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, Branišovská 31, 370 05, České Budějovice, Czech Republic.

Tapeworms (Cestoda: Proteocephalidae) are the dominant component of communities of intestinal parasites in pimelodid and other catfishes (Siluriformes) from South America. Even though these parasites have been studied intensively over more than one century, molecular taxonomy and phylogenetics have questioned their morphology-based classification, thus raising doubts about the systematic value of traits commonly used to circumscribe individual taxa. In the present study, members of three morphologically well-characterized genera of proteocephalids from pimelodid (Hemisorubim platyrhynchos and Sorubim lima) and auchenipterid (Ageneiosus inermis) catfishes from the Paraná or Amazon River basins were subjected to DNA sequencing of the large subunit nuclear ribosomal RNA (lsrDNA) and complete mitochondrial cytochrome c oxidase subunit I (COI). Phylogenetic analyses revealed the sister relationship between Manaosia bracodemoca and Mariauxiella piscatorum, and among Mariauxiella pimelodi and Ageneiella brevifilis. As a result, Mar. piscatorum and A. brevifilis are transferred to Manaosia and Mariauxiella, respectively, as Manaosia piscatorum n. comb. and Mariauxiella brevifilis n. comb., and the genus Ageneiella is suppressed. Diagnoses of Manaosia and Mariauxiella are amended. In addition, the present study revealed misidentification of tapeworms whose sequences are deposited in the GenBank database.
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http://dx.doi.org/10.1007/s00436-021-07138-3DOI Listing
May 2021

Three new species of Anacanthorus Mizelle & Price, 1965 (Monogenea: Dactylogyridae) from Markiana nigripinnis Perugia (Actinopterygii: Characidae) in Pantanal wetlands, Brazil.

Syst Parasitol 2020 12 19;97(6):661-667. Epub 2020 Sep 19.

Laboratório de Parasitologia Animal, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Cidade Universitária s/n°, CEP 79070-900, Campo Grande, MS, Brazil.

Three monogenean species, Anacanthorus luquei n. sp., A. scholzi n. sp. and A. cohenae n. sp. are described from the gills of the tetra fish Markiana nigripinnis (Perugia) (Characidae), collected in the Pantanal wetlands, State of Mato Grosso do Sul, Brazil. Among other differences, Anacanthorus luquei n. sp. differs from the most morphologically similar species, based on the structure of the accessory piece as follows: branches with smooth margins (vs with irregular margins in A. cuticulovaginus), without pointed projections at distal end (vs with projections in A. dipelecinus) and with 2 branches (vs 3 in A. quinqueramus). Anacanthorus scholzi n. sp. is most morphologically similar to A. luquei n. sp., differing from it because one of the branches of the accessory piece is bifurcated at the distal portion. Anacanthorus cohenae n. sp. can be differentiated from the congeners based on the combination of the following features: MCO cylindrical and robust with sclerotised flanges on the extremities, accessory piece V-shaped, bearing two branches similar in length and with blunt distal ends, and hooks with a proximal bulb. This is the first parasitological study on M. nigripinnis and, currently, Anacanthorus allocates 88 species infesting characiform fishes in the Neotropical region, including the three new species described here.
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http://dx.doi.org/10.1007/s11230-020-09935-3DOI Listing
December 2020

An integrative approach assesses the intraspecific variations of () , a common parasite in Neotropical freshwater fishes, and the phylogenetic patterns of Camallanidae.

Parasitology 2020 12 14;147(14):1752-1764. Epub 2020 Sep 14.

Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Presidente Antônio Carlos, 6627, Pampulha, CEP 31270-901, Belo Horizonte, MG, Brasil.

Integrative taxonomy was used to evaluate two component populations of Procamallanus (Spirocamallanus) inopinatus in Brazil and the phylogeny Camallanidae. Parasite populations were collected in the characiform Anostomoides passionis from River Xingu (Amazon basin) and Megaleporinus elongatus from River Miranda (Paraguay basin). Morphology was analysed using light and scanning electron microscopy (SEM). Genetic characterization was based on partial sequences of the 18S and 28S rDNA, and COI mtDNA. Phylogenies were based on 18S and COI due to data availability. Generalized Mixed Yule Coalescent (GMYC), Poisson Tree Process (PTP) and *BEAST were used for species delimitation and validation. SEM revealed for the first time the presence of minute denticles and pore-like structures surrounding the oral opening, phasmids in females and confirmed other important morphological aspects. Statistical comparison between the two-component populations indicated morphometric variations, especially among males. The different component population of P. (S.) inopinatus showed variable morphometry, but uniform morphology and were validated as conspecific by the GMYC, PTP and *BEAST. Some camallanid sequences in GenBank have incorrect taxonomic labelling. Host, environment and geographic aspects seem to be related to some lineages within Camallanidae; however, their real phylogenetic meanings are still unclear.
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http://dx.doi.org/10.1017/S0031182020001687DOI Listing
December 2020

Integrative taxonomy of Sprentascaris mahnerti and phylogeny of raphidascaridid nematodes (Nematoda: Ascaridoidea: Raphidascarididae) suggest the monophyly of Sprentascaris.

Parasitol Int 2020 Feb 27;74:101978. Epub 2019 Aug 27.

Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Av. Costa e Silva s/n, Campo Grande, MS CEP 79070-900, Brazil. Electronic address:

Sprentascaris mahnerti (Nematoda: Raphidascarididae) collected from Loricariichthys labialis (Siluriformes: Loricariidae) in the Pantanal wetlands, State of Mato Grosso do Sul (Brazil), was redescribed using light and scanning electron microscopy (SEM), and genetically characterised along with two other raphidascaridids: Raphidascaroides brasiliensis and Ro. moraveci. Due to the systematic discussion regarding Raphidascaris and Sprentascaris, as well as the poor knowledge about the phylogenetic relationships within Raphidascarididae, phylogenies were reconstructed based on partial sequences of the 18S and 28S nuclear rRNA gene, the nuclear ITS1-5.8S-ITS2 and the cytochrome c oxidase subunit I (cox1) mtDNA. Morphological study of S. mahnerti, confirmed some previously described features, revealed new characteristics and permitted to elucidate some inconsistencies noted in the literature. Morphological and genetic characterisation of S. mahnerti supported its validity. Phylogenetic reconstructions supported the monophyly of Sprentascaris, which has three pairs of interlabial conspicuous cuticular projections as a synapomorphy. The relationships among several lineages of raphidascaridids were unsolved, albeit Goezia and Ichthyascaris formed well-supported monophyletic assemblages, in which the first included species with no relations regarding the habitat of hosts and the geographic origin. The present findings represent one more step towards the understanding of the interrelationships of raphidascaridid nematodes. In this sense, Sprentascaris should be considered valid as an independent lineage from Raphidascaris.
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http://dx.doi.org/10.1016/j.parint.2019.101978DOI Listing
February 2020

An integrative taxonomic assessment of Procamallanus (Spirocamallanus) huacraensis (Nematoda: Camallanidae), infecting the freshwater catfish Trichomycterus spegazzinii (Siluriformes: Trichomycteridae) in Argentina.

Parasitol Res 2019 Oct 28;118(10):2819-2829. Epub 2019 Aug 28.

Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Av. Costa e Silva s/n°,, Campo Grande, MS, 79070-900, Brazil.

Procamallanus (Spirocamallanus) huacraensis infecting the catfish Trichomycterus spegazzinii from Escoipe River, Salta province (Argentina), is redescribed and genetically characterised for the first time, based on three genetic markers (nuclear 18S and 28S rRNA; cytochrome c oxidase subunit I [cox1] mtDNA). The phylogeny of Camallanidae was also discussed. Morphological evaluation of P. (S.) huacraensis using light and scanning electron microscopy revealed the previously undescribed features: location of deirids, accurate morphology of larvae (L1) and ovijector in females, as well as phasmids in males. Differences were found comparing the newly collected material and the type specimens, probably because the original description lacked detailing. Unfortunately, type specimens of P. (S.) huacraensis were no available for loan. The results of morphological and genetic analyses supported the validity of P. (S.) huacraensis. Inconsistencies regarding the taxonomic identification of species of Camallanidae in GenBank database were noted. Based on the current genetic database of Camallanidae, phylogenetic reconstructions using the 18S rRNA sequences were most consistent, due to the inclusion of higher number of taxa. Procamallanus (S.) huacraensis appeared as sister group of P. (S.) rarus, also isolated from a catfish in a neighbouring region. The order and habitat of hosts were also similar within some well-supported parasite lineages, but without common geographic origin. However, it is still premature to make definitive affirmations regarding the role of such features in the phylogenetic patterns of Camallanidae, given the scarcity of genetic data. The phylogenetic reconstructions also confirmed the artificiality of the morphology-based systematics of the family.
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http://dx.doi.org/10.1007/s00436-019-06429-0DOI Listing
October 2019

Occurrence of Isopods in Two Species of Snappers (Lutjanidae) from Northeast Brazil.

J Parasitol Res 2019 2;2019:8176283. Epub 2019 May 2.

Laboratório de Biologia Tropical, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, Sergipe, Brazil.

Parasitic isopod species are poorly known in the northeastern coast of Brazil. In this sense, this study presents novel records of Isopoda of the families Aegidae, Cymothoidae, and Corallanidae. A total 69 specimens of and 19 of , of which 46 isopods from 3 different species were collected, i.e. , and . The species and are reported for the first time in . A significant relationship between the parasite and the size of the fish was also observed. The isopod is considered an incidental finding in . To the authors' knowledge, this is the first report of this species in fish from Brazil. The three species of isopods are new occurrences in the State of Sergipe, northeast region of the country. An additional morphological characteristic observed in the dorsal setae of pleotelson in specimens of was that one end of this structure wws bifid. This information contributes to the current body of knowledge of the morphology of this particular species.
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http://dx.doi.org/10.1155/2019/8176283DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6521439PMC
May 2019

First description of the male of Philometroides acreanensis and phylogenetic assessment of Philometridae (Nematoda: Dracunculoidea) suggest instability of some taxa.

Parasitol Int 2019 Apr 31;69:30-38. Epub 2018 Oct 31.

Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências (INBIO), Universidade Federal de Mato Grosso do Sul (UFMS), Av. Costa e Silva s/n°, CEP 79070-900 Campo Grande, MS, Brazil. Electronic address:

The male of Philometroides acreanensis, parasitic in the anterior intestine external wall of the freshwater catfish Pimelodus blochii, from the Brazilian Amazon, is described for the first time. Additional data on the morphology of females is given. The new morphological data strengthened the validity of the species as well as its first genetic characterization, using three nuclear genetic markers (18S and 28S of the rDNA and ITS1-58S-ITS2), confirmed the high genetic resemblance of male and female specimens. Philometroides acreanensis shows morphological features of the generic diagnosis of Neophilometroides, Alinema, Philometra and Philometroides. Phylogenetic analyses using sequences of the18S rDNA from representatives of Dracunculoidea confirmed the validity of P. acreanensis and its close relatedness with Alinema rather than with other genera. The validity of Philonemidae was confirmed, as was the monophyly of Philometridae and Clavinema. However, Dentiphilometra, Philometra and Philometroides appear not to be monophyletic. Host taxa, habitat and geographic occurrence seem to have some relationship with the evolutionary traits of certain phylogenetic assemblages of philometrids, which were highly supported in the phylogentic reconstructions. Even though interesting aspects of the phylogeny and taxonomy of Philometridae came to light, further integrative approaches should be used that include additional genetic markers, due to the loose boundaries between some genera as observed here.
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http://dx.doi.org/10.1016/j.parint.2018.10.010DOI Listing
April 2019

Community structure of metazoan parasites from Pimelodus blochii in two rivers of the Western Brazilian Amazon: same seasonal traits, but different anthropogenic impacts.

Parasitol Res 2018 Dec 17;117(12):3791-3798. Epub 2018 Sep 17.

Programa de Pós-Graduação em Biologia Animal, Instituto de Biociências (INBIO), Universidade Federal de Mato Grosso do Sul (UFMS), Av. Costa e Silva s/n°, Campo Grande, MS, 79070-900, Brazil.

The present investigation evaluated the influence of seasonality and locality on the structure of the parasite community of the catfish Pimelodus blochii. A total of 160 fish were collected from two rivers in the State of Acre, western Brazilian Amazon: 80 fish in River Acre and 80 in River Iaco, with 40 in each season (rainy and drought). The overall prevalence was 78.7% and 1461 parasite specimens (adults and larvae) were allocated in 22 taxa: 5 of Monogenea, 10 of Nematoda, 3 of Digenea, 1 of Cestoda and 3 of Crustacea. In drought season, Procamallanus (Spirocamallanus) pimelodus and Demidospermus peruvianus were more prevalent in River Acre and Iaco, respectively. The parasite diversity (Brillouin index) as well as the prevalence and abundance of the monogeneans D. peruvianus, D. striatus, Demidospermus sp. and Ameloblastella sp. were higher in River Acre. The parasite community structure were dissimilar among rivers, and seasonally in River Iaco. These results suggest that environmental traits may overshadow seasonal influences on the parasite community structure, which may be related to the higher anthropization in River Acre. Furthermore, seasonality exerted less influence on the parasite community than expected, probably because the two rivers have different hydrological traits than those of other rivers in the Brazilian Amazon. New host and locality records expanded our knowledge of parasite biodiversity of P. blochii.
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http://dx.doi.org/10.1007/s00436-018-6082-5DOI Listing
December 2018

Molecular phylogeny of the gill parasite Henneguya (Myxosporea: Myxobolidae) infecting Astyanax lacustris (Teleostei: Characidae) from fish farm in Brazil.

Microb Pathog 2018 Oct 25;123:372-376. Epub 2018 Jul 25.

Department of Basic Sciences, Faculty of Animal Science and Food Technology, University of São Paulo, 13635-900, Pirassununga, SP, Brazil.

Molecular data of Henneguya chydadea Barassa, Cordeiro and Arana, 2003, found in the gill filaments of Astyanax lacustris bred in fish farm in the State of Mato Grosso do Sul, Brazil was obtained in order to estimate their phylogenetic position among other platysporines myxosporean. The prevalence of the parasite was 28.1% and the range intensity was 1-3 plasmodia per fish. The shape and measurements of mature myxospores were consistent with the characteristics previously defined to H. chydadea. The SSU rDNA sequence of the myxospores of H. chydadea resulted in a total of 1405 nucleotides, and this sequence did not match any of the myxozoan available in the GenBank. Phylogenetic analysis showed H. chydadea within the clade of histozoic myxosporeans and closed together with Henneguya rotunda and Myxobolus pantanalis reported in the gill arch and fins and gill filaments of Salminus brasiliensis respectively. Nonetheless, the SSU rDNA sequences of H. chydadea, H. rotunda and M. pantanalis have only 85.2% and 84.4% similarity, respectively. This is the first molecular study of a Henneguya species that parasitizes a fish belonging to the genus Astyanax in South America. The importance of myxosporeans introduction to new locations along with infected cultured host is emphasized.
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http://dx.doi.org/10.1016/j.micpath.2018.07.037DOI Listing
October 2018

Redescription of the nematode parasites of lizards: Strongyluris oscari Travassos, 1923 (Heterakidae) from Brazil and Pharyngodon mamillatus (Linstow, 1897) (Pharyngodonidae) from Egypt.

Acta Parasitol 2017 Dec;62(4):805-814

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Strongyluris oscari Travassos, 1923, parasite of Topidurus torquatus (Wied-Neuwied, 1820) (Tropiduridae) from Brazil and Pharyngodon mamillatus (Linstow, 1897) of Chalcides ocellatus (Forskal, 1775) (Scincidae) from Egypt, were redescribed based on light and scanning electron microscopy, and re-evaluation of specimens from parasitological collections. The following features were accurately observed in S. oscari for the first time: structure of lips and pharyngeal valve, presence and distribution of somatic papillae, number and arrangement of caudal papillae, presence of inner sclerotised structures supporting the ventral sucker and the ventral region in tail of males, and structure of the posterior anal lip in females. The unpaired papilla on the inferior edge of the ventral sucker in males of S. oscari is a cuticular groove instead of a true papilla. Regarding the morphology of P. mamillatus the following features were given in details for the first time: structure of the cephalic end in both male and female, location of amphids, position of phasmids in females and the accurate morphology of caudal bursa in males, including the distribution of caudal papillae and the genital cone morphology. Strongyluris oscari and P. mamillatus have no intraspecific morphological variations, but wide range on biometric features. These variations may be accounted by host/environment attributes, since they exhibit wide host and geographical spectra. The present results increased the morphological knowledge of P. mamillatus and S. oscari, strengthening their taxonomic validity.
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http://dx.doi.org/10.1515/ap-2017-0097DOI Listing
December 2017

Parapharyngodon hugoi n. sp., a new nematode (Oxyuroidea: Pharyngodonidae) of the tree frog Trachycephalus typhonius (Linnaeus) from the Brazilian Pantanal, including a key to the congeners from amphibians of the American continent.

Syst Parasitol 2017 06 21;94(5):599-607. Epub 2017 Apr 21.

Laboratório de Parasitologia Veterinária, Instituto de Biociências, Universidade Federal do Mato Grosso do Sul, Cidade Universitária S/N, Campo Grande, Mato Grosso do Sul, CEP 79070-900, Brazil.

A new nematode Parapharyngodon hugoi n. sp. (Oxyuroidea: Pharyngodonidae) is described parasitising the large intestine of the tree frog Trachycephalus typhonius (Linnaeus) (Anura: Hylidae) from the wetlands of Pantanal, State of Mato Grosso do Sul, Brazil. The new species exhibits a unique structure of the posterior cloacal lip in males, which is supported by a rigid V-shaped structure. Parapharyngodon hylidae parasitic in hylid frogs, including T. typhonius, from Mexico, is the most similar congener to P. hugoi n. sp. but is distinguished from the new species by the presence of a gubernaculum (vs absence), by the lateral alae in males ending far anterior to cloacal opening (vs near to it) and because in gravid females the ovaries encircle the oesophageal corpus. Additionally, the new species differs from its congeners as well as from species of Thelandros Wedl, 1862, a very closely related genus, by the combination of features such as spicule length, number of caudal papillae, morphology of the anterior cloacal lip, which is echinate, and position of ovaries. The geographical distribution of hosts seems to play an important role in the speciation process of Parapharyngodon spp.; however, due the lack of molecular data this issue along with the validity of both Thelandros and Parapharyngodon are still questions to be solved in the future, after improvement of the genetic database. A key to the species of Parapharyngodon parasitic in amphibians from the American continent is provided.
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http://dx.doi.org/10.1007/s11230-017-9725-5DOI Listing
June 2017

A Morphological and Molecular Study of Spectatus spectatus (Kathlaniidae), Including Redescription of the Species and Amendment of Genus Diagnosis.

J Parasitol 2015 Aug 28;101(4):468-75. Epub 2015 Apr 28.

Programa de Pós-Graduação em Ciências Veterinárias, Universidade Federal Rural do Rio de Janeiro, Caixa Postal 74.540, 23851-970, Seropédica, RJ, Brazil.

Spectatus spectatus Travassos, 1923 (Nematoda: Kathlaniidae) found in the intestine of Piaractus mesopotamicus (Holmberg, 1887) (Characiformes: Serrasalmidae) from the River Miranda, Mato Grosso do Sul, Brazil is redescribed based on morphological evaluation of newly collected material and examination of type and voucher specimens from the Coleção Helmintológica do Instituto Oswaldo Cruz. The following characteristics previously unreported or insufficiently described were observed: morphology of lips, presence of lamellae-like supplementary lips, presence of pharynx and cuticular ring surrounding the oral opening associated with a complex cuticular apparatus anterior to the pharynx, the number and arrangement of caudal papillae (13 pairs plus 1 unpaired), and the position of nerve ring. Since S. spectatus is the type species of Spectatus, the diagnosis of this Neotropical genus is amended. Synonymy of Chabaudinema Díaz-Ungría, 1968 with Spectatus, first proposed in 1980 by Baker, is supported by the present data. Molecular data that include the first sequence of the SSU rDNA for any species of Spectatus indicate a basal position of S. spectatus within Cosmocercoidea, forming a distant lineage from that comprising 2 species of Falcaustra Lane, 1915. This separate position of S. spectatus supports validity of the genus.
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http://dx.doi.org/10.1645/15-764.1DOI Listing
August 2015

A morphological and molecular study of two species of Raphidascaroides Yamaguti, 1941 (Nematoda: Anisakidae), parasites of doradid catfish (Siluriformes) in South America, with a description of R. moraveci n. sp.

Syst Parasitol 2015 May 11;91(1):49-61. Epub 2015 Apr 11.

Programa de Pós-Graduação em Ciências Veterinárias and Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, Caixa Postal 74540, Rio de Janeiro, CEP 23851-970, Brazil.

Nematodes of the genus Raphidascaroides Yamaguti, 1941 parasitising doradid catfishes (Siluriformes: Doradidae) in Brazil were studied based on morphological and molecular evaluation of newly collected material. A new species, Raphidascaroides moraveci n. sp., is described from the intestine of Platydoras armatulus (Valenciennes) from River Miranda, River Paraguay basin, Pantanal, Mato Grosso do Sul. The new species differs from all of the congeners in having short spicules (163-217 μm in length) representing less than 1% of the total body length and in the posterior region of cloacal opening covered by small rudimentary spines. In addition, it differs from the other congeneric species in the number and arrangement of the caudal papillae and the structure of lips and tail. Raphidascaroides moraveci n. sp. is the third species described from freshwater fishes and the second one in the Neotropical Region. New morphological data on R. brasiliensis Moravec & Thatcher, 1997 from Megalodoras uranoscopus (Eigenmann & Eigenmann) and Platydoras costatus (Linnaeus) (both new host records) from River Xingu, River Amazon basin, Pará, are provided including scanning electron micrographs of taxonomically important structures. The differentiation of the new species is supported by molecular data (partial sequences of the small and large subunits of the rRNA gene).
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http://dx.doi.org/10.1007/s11230-015-9555-2DOI Listing
May 2015

Diet and nematode infection in Proceratoprhys boiei from two Atlantic rainforest remnants in Southeastern Brazil.

An Acad Bras Cienc 2011 Dec;83(4):1303-12

Departamento de Ecologia, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Brasil.

Proceratophrys boiei is an endemic cycloramphid anuran inhabiting the leaf litter of Atlantic rainforests in Southeastern Brazil. We analyzed the whole digestive tract of 38 individuals of Proceratophrys boiei collected in two Atlantic Rainforest areas in the state of Rio de Janeiro, Brazil, to study the diet composition and the helminth fauna associated with this species. The main food items in P. boiei's diet were Coleoptera, Orthoptera and Blattaria. Five nematode species were found: Aplectana delirae, Cosmocerca parva, Oxyascaris oxyascaris, Physaloptera sp. (larval stage only) and an unidentified nematode. Overall prevalence was 71% and mean infection intensity was 7.3 ± 5.8 neatodes per individual.
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http://dx.doi.org/10.1590/s0001-37652011000400017DOI Listing
December 2011

[Relationship between biomass and parasite density of Mediorhynchus emberizae (Acanthocephala: Gigantorhynchidae) parasites of Paroaria dominicana (Passeriformes: Emberizidae) of the State of Bahia, Brazil].

Rev Bras Parasitol Vet 2008 Apr-Jun;17(2):118-21

Curso de Pós-Graduação em Ciências Veterinárias, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brasil.

During the study of the metazoan parasites of Paroaria dominicana (Linnaeus, 1758), eight infrapopulations of Mediorhynchus emberizae (Rudolphi, 1819), were collected in the medium third of the small intestine, with parasite intensities ranging from one to ten specimens. Differences among the average values of the biomass, volume of the eggs, volume of the testicles and the parasite density of the infrapopulations were statistically tested in order to detect variations of these parameters in function of parasite density. Was observed that the acanthocephalans biomass increased with the volume of the intestine and also that the parasite density increased with the parasite intensity in the infrapopulations. It was verified that the increase of the parasite intensity was accompanied by the decrease of the mean biomass of the parasites. Decrease of the volume of the eggs was verified with the increase of the density and of the parasite intensity. The results of the present work could suggested the occurrence of density-dependent factors and the decrease of testicles volume and the biomass of the males with the increase of the parasite density in the infrapopulations of M. emberizae in the intestine of P. dominicana.
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http://dx.doi.org/10.1590/s1984-29612008000200012DOI Listing
January 2009

Similarity between metazoan parasite communities of two sympatric brackish fish species from Brazil.

J Parasitol 2008 Aug;94(4):985-9

Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, RJ, CEP, Brazil.

Between March 2000 and February 2003, 63 specimens of Genidens barbus and 69 specimens of Aspistor luniscutis (Siluriformes: Ariidae), sympatric species from the coastal zone of Angra dos Reis (23 degrees 01'S, 44 degrees 19'W), RJ, Brazil, were necropsied to study their metazoan parasite communities. Parasite community descriptors were calculated and possible similarities statistically tested. Twenty-two species of metazoan parasites were identified, 15 species from G. barbus and 16 associated with A. luniscutis. Nine species were common to both host species; 4 of them exhibited significant differences in terms of abundance and prevalence. Mean total abundance, species richness, diversity, evenness, and Berger-Parker dominance values were not significantly different in the 2 species of fish. Similarity within parasite infracommunities showed highest homogeneity in A. luniscutis. The parasite infracommunities of A. luniscutis and G. barbus were characterized by ectoparasite dominance and scarcity of species with high prevalence. Nevertheless, low values of similarity were observed between infracommunities, and evidence for 2 distinct infracommunities groups was found.
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http://dx.doi.org/10.1645/GE-1460.1DOI Listing
August 2008

[Quantitative and morfometrical aspects in infrapopulations of Platynosomum illiciens (Trematoda: Dicrocoeliidae) in Paroaria dominicana (Passeriformes: Emberizidae) from the state of Bahia, Brazil].

Rev Bras Parasitol Vet 2007 Oct-Dec;16(4):181-5

Curso de Pós-Graduação em Ciências Veterinárias, Universidade Federal Rural do Rio de Janeiro, Km 7 da BR 465, Seropédica, RJ, 23890-000, Brasil.

During the study of the metazoan parasites of Paroaria dominicana Linnaeus, 1758 (Passeriformes), four infrapopulations of Platynosomum illiciens (Brown, 1901) (Trematoda), parasitic in the liver ducts were collected, with intensity of infection 10, 11, 18 and 36 specimens respectively. Differences between the means of morphometrical values and the total number of eggs were statistically tested. The liver weigh were not significantly correlated with avian total weigh and length, and with the total parasitic abundance. Positive correlations were observed between the size of infrapopulations and the total number of eggs, and between parasite body size and the eggs. size. Negative correlations were observed between parasitic intensity and liver weigh; between the size of infrapopulations and the parasite body size; between total number and the size of eggs and between parasite body size and total number of eggs. These results suggests that host with smaller liver had greater infrapopulations. These greater infrapopulations showed smaller parasite body size and higher size and number of eggs.
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http://dx.doi.org/10.1590/s1984-29612007000400001DOI Listing
August 2008

Larvals of Terranova sp. (Nematoda: Anisakidae) parasitic in Plagioscion squamosissimus (Perciformes: Sciaenidae) from Araguaia River, State of Tocantins, Brazil.

Rev Bras Parasitol Vet 2007 Apr-Jun;16(2):110-5

Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Km 07 da BR 465, Seropédica, RJ, Brazil.

During the study of the metazoan parasites of fishes from Araguaia River, municipality of Araguatins (05 degrees 39'S, 48 degrees 07'W), State of Tocantins, Brazil, a third stage larvae of an undescribed species of Terranova were collected from the mesenteries of Plagioscion squamosissimus. These larvae were characterized to present large size, excretory pore situated near of the base of ventrolateral lips, presence of short intestinal caecum dorsal to oesophagus, ventriculus less than seven times as long as wide and absence of mucron. This is the first record and description of larval of species of Terranova parasitic in South American freshwater fishes.
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April 2008

Histological approaches for high-quality imaging of zooplanktonic organisms.

Micron 2007 18;38(7):714-21. Epub 2007 May 18.

Laboratory of Cellular Biology, Department of Biology, Federal University of Juiz de Fora, UFJF, Juiz de Fora, MG, Brazil.

The investigation of the internal organization of zooplankton communities provides important information on the plankton biology with special interest for the study of ecological processes. Zooplanktoners can play a structural function as indicators for ecosystem health or stress, but their study using histological techniques is still limited. Here we report that the internal structure of zooplanktonic organisms can be facilely observed by a histological approach that combines optimal fixation and processing with a plastic resin (glycol methacrylate) embedding, resulting in increased tissue resolution. Using copepods, organisms that can dominate zooplankton assemblages, as models, collected from a tropical ecosystem (Paraibuna river, Brazil), we showed fine histological details of their muscular, nervous and digestive systems, structure of appendages and cell features. Critical advantages of this approach are that it permits optimal preservation and adequate handling of the organisms (embedded in agar after fixation) for further histological processing and investigation. This is important because it prevents both mechanically induced artifacts and loss of these diminutive organisms during the different steps of processing. Moreover, embedding in plastic resin showed a superior imaging of copepod internal structures compared to paraffin embedding. The use of glycol methacrylate is advantageous over paraffin/paraplast embedding by avoiding heat damage, tissue retraction and allowing faster embedding procedure and better tissue resolution. The value of histological approaches in enabling high-quality imaging of the internal structure of copepods is particularly important because these organisms can be used as indicators of environmental changes.
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http://dx.doi.org/10.1016/j.micron.2007.05.002DOI Listing
October 2007

[Anisakidae larvae (Nematoda: Ascaridoidea) parasites of the bluewing searobin Prionotus punctatus (Bloch, 1793) (Osteichthyes: Triglidae) from the coastal zone of the State of Rio de Janeiro, Brazil].

Rev Bras Parasitol Vet 2005 Jul-Sep;14(3):109-18

Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brazil.

Eighty specimens of Prionotus punctatus (Bloch, 1793) from Angra dos Reis, coastal zone of the State of Rio de Janeiro (23 degrees 01 'S, 44 degrees 19 'W), were necropsied to study their metazoan parasites. Three species of larval nematodes anisakids were found, Anisakis sp., Hysterothylacium sp. and Raphidascaris sp. from the liver and mesenteries. These nematodes are described and a revision of available literature concerning nematodes belonging to these genera was made.
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May 2006

Human diphyllobothriasis: reports from Rio de Janeiro, Brazil.

Rev Bras Parasitol Vet 2005 Apr-Jun;14(2):85-7

Universidade Federal Rural do Rio de Janeiro, Instituto de Veterinária, Departamento de Parasitologia Animal, Caixa Postal 74508, CEP: 23851-970, Seropédica, RJ, Brazil.

This paper reports the occurrence of diphyllobothrid operculated eggs with abopercular knob, found in stool samples from 5 adult humans from Rio de Janeiro, who usually ate raw fish as sushi and sashimi, and presented gastrointestinal disturbances.
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October 2005

[Metazoan parasites of the bluewing searobin Prionotus punctatus (Bloch, 1793) (Osteichthyes: Triglidae) from the coastal zone of the State of Rio de Janeiro, Brazil].

Rev Bras Parasitol Vet 2005 Jan-Mar;14(1):27-33

UFRRJ, Instituto de Veterinária, Departamento de Parasitologia Animal, Caixa Postal 74508, CEP: 23890-970, Seropédica, RJ, Brazil.

Eighty specimens of P. punctatus from Angra dos Reis, coastal zone of the State of Rio de Janeiro (23 degrees 01'S, 44 degrees 19'W), were necropsied between May 2002 to August 2003 to study their infracommunities of metazoan parasites. Were collected 23 species of metazoan parasites: 4 digenean, 2 monogeneans, 2 cestodes, 2 acantocephalans, 6 nematodes, 3 copepods, 2 branchiura, 1 isopod and 1 hirudinean. All fishes were parasitized by two or more parasites species. The nematodes was the predominant taxon (58.6% of parasites collected). Hysterothylacium sp. was the most prevalent, abundant and dominant species. The total of parasites collected and the parasites species richness were significantly correlated with host's total length. Ten species of parasites showed significantly correlation between parasites abundance and total length of P. punctatus. The sex of the host showed positive influence on abundance and prevalence of Hysterothylacium sp., Progrillotia dollfusi Carvajal and Rego, 1983 and Dolops sp. Four pairs of adult endoparasites, one pair of endoparasites larval stages and two pairs of ectoparasites presented association and/or covariation between its prevalences and abundances, respectively. Quantitative dominance of endoparasites in the parasite community of P. punctatus could be related with the predatorious behavior of this fish.
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October 2005

A new species of Acantholochus (Copepoda: Bomolochidae) parasitic on Centropomus undecimalis (Osteichthyes: Centropomidae) from the coastal zone of the State of Rio de Janeiro, Brazil.

Mem Inst Oswaldo Cruz 2003 Mar 15;98(2):241-5. Epub 2003 May 15.

Departamento de Parasitologia Animal, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, Brasil.

A new species of Acantholochus Cressey, 1984 (Copepoda: Bomolochidae) parasitic on the gills of common snook, Centropomus undecimalis, from the coastal zone of the State of Rio de Janeiro, Brazil, is described and illustrated. The new species differs from all other species of Acantholochus by the presence of only one inner seta on middle segment of the second and third endopods.
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http://dx.doi.org/10.1590/s0074-02762003000200013DOI Listing
March 2003
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