35 research outputs found
DOS NUEVAS ESPECIES DE PAVANELLIELLA (MONOGENEA, DACTYLOGYRIDAE) PARÁSITOS DE PECES PIMELÓDIDOS DEL RIO MOGI GUAÇU, SUDESTE DE BRASIL Y NOTAS SOBRE LA MORFOLOGÍA DE P. PAVANELLII
Two new species of Pavanelliella (Dactylogyridae) were described and some details about the morphology of Pavanelliella pavanellii Kritsky & Boeger, 1998 were added based on specimens collected from pimelodid fishes from Mogi Guaçu River, Brazil. Pavanelliella takemotoi sp. n., collected from nasal cavities of Pimelodus maculatus Lacepède, 1803 differs from its congeners by having a male copulatory organ (MCO) with 2–5 rings, vaginal canal sinuous without loops in distal portion of vaginal canal and anteriorly directed vagina containing five irregular rings around the vestibule. Pavanelliella laertei sp. n. collected from P. heraldoi Azpelicueta, 2001 is separated from the other species of the genus by lacking a vaginal vestibule and by distal end shape of accessory piece, which resemble flames or is bifurcated with one flank hooked in P. laertei sp. n. The specimens of P. pavanellii examined in this study showed morphological variations especially on MCO, vaginal canal and vagina morphology with respect to the holotype and paratype and are noted in this paper. Significant differences among the described species were confirmed on the light of multivariate morphometric statistical analysis. Initially a Principal Component Analysis (PCA) showed the multivariate distinction between the three species and after a Linear Discriminant Analysis (LDA) revealed that the Maximum number of MCO ring and the MCO length fairly contributed to the discrimination between all Pavanelliella species (Wilk´s lambda = 0.006; p<0.000). This is the first record of Pavanelliella species in Mogi Guaçu River.Dos nuevas especies de Pavanelliella (Dactylogyridae) fueron descritas y algunos detalles sobre la morfología de Pavanelliella pavanellii Kritsky & Boeger, 1998 se han añadido sobre la base de especímenes colectados en los peces pimelódidos del rio Mogi Guaçu, Brasil. Pavanelliella takemotoi sp. n., colectado de las cavidades nasales de Pimelodus maculatus Lacepède, 1803 se diferencia de sus congéneres por tener un órgano copulador masculino (OCM) con 2-5 anillos, canal vaginal sinuoso, pero nunca con lazos en la porción distal del canal vaginal y la vagina es dirigida anteriormente y tiene cinco anillos irregulares alrededor del vestíbulo. Pavanelliella laertei sp. n. colectados de P. heraldoi Azpelicueta, 2001 se diferencia de las otras especies del género por La falta de un vestíbulo vaginal y por la forma de extremo distal de la pieza accesoria, que se asemeja a las llamas o se bifurca con un flanco enganchado en P. laertei sp. n. las muestras de P. pavanellii examinadas en este estudio mostraron variaciones morfológicas, especialmente en la morfología de OCM, canal vaginal y de la vagina con respecto al holótipo y parátipo, y se discuten en esta investigación. Todas las diferencias entre las especies estudiadas fueron confirmadas com el uso del análisis estadístico morfométrico multivariada. Inicialmente, un Análisis de Componentes Principales (ACP) mostró la distinción multivariado entre las tres especies y después un Análisis Discriminante Lineal (ADL) reveló que el número máximo de anillos del OCM y la longitud del OCM contribuyeron bastante a la discriminación de todas las especies de Pavanelliella (Wilk´s lambda = 0,006; p<0,000). Este es el primer registro de especies de Pavanelliella en el río Mogi Guaçu
UNA NUEVA ESPECIE DE TEREANCISTRUM (MONOGENEA, DACTYLOGYRIDAE) PARÁSITO DE PROCHILODUS LINEATUS (VALENCIENNES, 1837) (CHARACIFORMES) DEL RIO MOGI GUAÇU, BRASIL
Species of Prochilodus Agassiz 1829 are among the most abundant fishes of South America basins and has good potential for pisciculture. During a study of the helminth parasites of Prochilodus lineatus (Valenciennes, 1837) (Characiformes) from Mogi Guaçu River, Brazil, a new species of Tereancistrum was collected. Tereancistrum pirassununguensis n. sp. can be distinguished from the other Tereancistrium species mainly by having a reduced accessory anchor sclerite with a little groove at the end; MCO as a sclerotized coiled tube forming two counterclockwise rings; an accessory piece as an inverted C, rod-like, not articulated at the base of the MCO; curved ventral bar; hooks similar with erect thumb and slightly curved shaft and point, slightly expanded shank proximally. This is the first record of a species of Tereancistrum in the southeastern of Brazil.Las especies del género Prochilodus Agassiz 1829 son de las más abundantes en los ríos de América del Sur y presentan un buen potencial para la piscicultura. En investigaciones de monogeneos en Prochilodus lineatus (Valenciennes, 1837) (Characiformes) del río de Mogi Guaçu, Brasil, fue encontrada una nueva especie de Tereancistrum pirassununguensis n. sp. se distingue de las otras especies del género principalmente por presentar el esclerito accesorio de la áncora ventral con un pequeño surco en la extremidad. Además, presenta el órgano copulador masculino formando 2 anillos en sentido anti horario; una pieza accesoria como una C invertida, cilindrica, que sirve como guía la parte distal del órgano copulador masculino, no articulada en la base del OCM; barra ventral curva; ganchos similares, pulgar erecto, lamina y punta levemente curvas, hasta levemente expandida en la región proximal. Este es el primer registro de una especie de Tereancistrum en región sudeste de Brasi
Prevalence, geographic and seasonal distribution of protozoan and myxozoan parasites of jaú (Zungaro jahu) in the Pantanal of Mato Grosso, Brazil
Estudo realizado no Pantanal Matogrossense, avaliou a prevalência, a distribuição geográfica e sazonal de protozoários e mixozoários parasitos de jaú (Zungaro jahu). Os peixes foram capturados no Sul do Pantanal, na região dos rios Aquidauana, Miranda e Paraguai, em 2001, 2002 e 2003, na região Central (Parque Nacional do Pantanal - PARNA Pantanal) em 2003, 2004, 2005 e 2008, e na região Norte (rios Cuiabá e Manso, no município de Nobres) em 2003, 2004 e 2005. Foi identificado Trichodina sp. parasitando pele e brânquias de jaú nas três regiões estudadas. Ocorrência de Epistylis sp. na pele e Cryptobia sp. nas brânquias foram restritas às coletas da região Central, enquanto Ichthyophthirius multifiliis foi identificado parasitando a pele nas três regiões estudadas. Também foi observada a ocorrência de mixozoários, Myxobolus cordeiroi parasitando vários órgãos e Henneguya sp. parasitando brânquias de jaú das três regiões estudadas
Phylogeny, ultrastructure, histopathology and prevalence of Myxobolus oliveirai sp. nov., a parasite of Brycon hilarii (Characidae) in the Pantanal wetland, Brazil
This paper presents the morphological, histological and ultrastructural characteristics of Myxobolus oliveirai sp. nov., a parasite of the gill filaments in Brycon hilarii from the Brazilian Pantanal. Out of 216 B. hilariispecimens examined (126 wild and 90 cultivated), 38.1% of wild specimens (n = 48) were infected. The parasites form elongated plasmodia primarily in the tip of gill filaments, reaching about 3 mm in length. A thorough comparison with all the Myxobolus species described from South American hosts, as well as nearly all the Myxobolus species described so far is provided. Partial sequencing of the 18S rDNA gene revealed a total of 1,527 bp. The Myxobolus species parasite of B. hilarii did not match any of the Myxozoa available in GenBank. In the phylogenetic analysis, M. oliveirai sp. nov. composed a monophyletic group with eight other species: five species of Myxobolus parasites of mugilid fishes, two parasites of pangasiid and one of centrarchid. Infection prevalence values of the parasite revealed no significant differences between wet and dry seasons or between males and females. The importance of the infection to the farming of the host species is emphasized.FAPESPCEPTA - ICMBioCoordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES
Phylogeny, ultrastructure, histopathology and prevalence of Myxobolus oliveirai sp. nov., a parasite of Brycon hilarii (Characidae) in the Pantanal wetland, Brazil
This paper presents the morphological, histological and ultrastructural characteristics of Myxobolus oliveirai sp. nov., a parasite of the gill filaments in Brycon hilarii from the Brazilian Pantanal. Out of 216 B. hilariispecimens examined (126 wild and 90 cultivated), 38.1% of wild specimens (n = 48) were infected. The parasites form elongated plasmodia primarily in the tip of gill filaments, reaching about 3 mm in length. A thorough comparison with all the Myxobolus species described from South American hosts, as well as nearly all the Myxobolus species described so far is provided. Partial sequencing of the 18S rDNA gene revealed a total of 1,527 bp. The Myxobolus species parasite of B. hilarii did not match any of the Myxozoa available in GenBank. In the phylogenetic analysis, M. oliveirai sp. nov. composed a monophyletic group with eight other species: five species of Myxobolus parasites of mugilid fishes, two parasites of pangasiid and one of centrarchid. Infection prevalence values of the parasite revealed no significant differences between wet and dry seasons or between males and females. The importance of the infection to the farming of the host species is emphasized1056762769sem informaçã
Temporal stability for unpredictable annual climatic variability for Hevea genotype selection
Phylogeny, ultrastructure, histopathology and prevalence of Myxobolus oliveirai sp. nov., a parasite of Brycon hilarii (Characidae) in the Pantanal wetland, Brazil
Two new species of Pavanelliella (Monogenea, Dactylogyridae) parasitic on pimedolid fishes from Mogi Guaçu river, Southeastern Brazil, and notes on the morphology of P. Pavanellii
Two new species of Pavanelliella (Dactylogyridae) were described and some details about the
morphology of Pavanelliella pavanellii Kritsky & Boeger, 1998 were added based on specimens
collected from pimelodid fishes from Mogi Guaçu River, Brazil. Pavanelliella takemotoi sp. n.,
collected from nasal cavities of Pimelodus maculatus Lacepède, 1803 differs from its congeners by
having a male copulatory organ (MCO) with 2�5 rings, vaginal canal sinuous without loops in distal
portion of vaginal canal and anteriorly directed vagina containing five irregular rings around the
vestibule. Pavanelliella laertei sp. n. collected from P. heraldoi Azpelicueta, 2001 is separated from the
other species of the genus by lacking a vaginal vestibule and by distal end shape of accessory piece,
which resemble flames or is bifurcated with one flank hooked in P. laertei sp. n. The specimens of P.
pavanellii examined in this study showed morphological variations especially on MCO, vaginal canal
and vagina morphology with respect to the holotype and paratype and are noted in this paper.
Significant differences among the described species were confirmed on the light of multivariate
morphometric statistical analysis. Initially a Principal Component Analysis (PCA) showed the
multivariate distinction between the three species and after a Linear Discriminant Analysis (LDA)
revealed that the Maximum number of MCO ring and the MCO length fairly contributed to the
discrimination between all Pavanelliella species (Wilk´s lambda = 0.006; p<0.000). This is the first
record of Pavanelliella species in Mogi Guaçu River.Dos nuevas especies de Pavanelliella (Dactylogyridae) fueron descritas y algunos detalles sobre la
morfología de Pavanelliella pavanellii Kritsky & Boeger, 1998 se han añadido sobre la base de
especímenes colectados en los peces pimelódidos del rio Mogi Guaçu, Brasil. Pavanelliella takemotoi
sp. n., colectado de las cavidades nasales de Pimelodus maculatus Lacepède, 1803 se diferencia de sus
congéneres por tener un órgano copulador masculino (OCM) con 2-5 anillos, canal vaginal sinuoso, pero nunca con lazos en la porción distal del canal vaginal y la vagina es dirigida anteriormente y tiene
cinco anillos irregulares alrededor del vestíbulo. Pavanelliella laertei sp. n. colectados de P. heraldoi
Azpelicueta, 2001 se diferencia de las otras especies del género por La falta de un vestíbulo vaginal y
por la forma de extremo distal de la pieza accesoria, que se asemeja a las llamas o se bifurca con un
flanco enganchado en P. laertei sp. n. las muestras de P. pavanellii examinadas en este estudio
mostraron variaciones morfológicas, especialmente en la morfología de OCM, canal vaginal y de la
vagina con respecto al holótipo y parátipo, y se discuten en esta investigación. Todas las diferencias
entre las especies estudiadas fueron confirmadas com el uso del análisis estadístico morfométrico
multivariada. Inicialmente, un Análisis de Componentes Principales (ACP) mostró la distinción
multivariado entre las tres especies y después un Análisis Discriminante Lineal (ADL) reveló que el
número máximo de anillos del OCM y la longitud del OCM contribuyeron bastante a la discriminación
de todas las especies de Pavanelliella (Wilk´s lambda = 0,006; p<0,000). Este es el primer registro de
especies de Pavanelliella en el río Mogi Guaçu
Anew species of Tereancistrum (Monogenea, Dactylogyridae) parasitic on Prochilodus lineatus (Valenciennes, 1837) (Characiformes) from Mogi Guaçu River, Brazil.
Species of Prochilodus Agassiz 1829 are among the most abundant fishes of South America basins
and has good potential for pisciculture. During a study of the helminth parasites of Prochilodus
lineatus (Valenciennes, 1837) (Characiformes) from Mogi Guaçu River, Brazil, a new species of
Tereancistrum was collected. Tereancistrum pirassununguensis n. sp. can be distinguished from the
other Tereancistrium species mainly by having a reduced accessory anchor sclerite with a little groove
at the end; MCO as a sclerotized coiled tube forming two counterclockwise rings; an accessory piece
as an inverted C, rod-like, not articulated at the base of the MCO; curved ventral bar; hooks similar
with erect thumb and slightly curved shaft and point, slightly expanded shank proximally. This is the
first record of a species of Tereancistrum in the southeastern of Brazil.Las especies del género Prochilodus Agassiz 1829 son de las más abundantes en los ríos de América del
Sur y presentan un buen potencial para la piscicultura. En investigaciones de monogeneos en
Prochilodus lineatus (Valenciennes, 1837) (Characiformes) del río de Mogi Guaçu, Brasil, fue
encontrada una nueva especie de Tereancistrum pirassununguensis n. sp. se distingue de las otras
especies del género principalmente por presentar el esclerito accesorio de la áncora ventral con un
pequeño surco en la extremidad. Además, presenta el órgano copulador masculino formando 2 anillos
en sentido anti horario; una pieza accesoria como una C invertida, cilindrica, que sirve como guía la
parte distal del órgano copulador masculino, no articulada en la base del OCM; barra ventral curva;
ganchos similares, pulgar erecto, lamina y punta levemente curvas, hasta levemente expandida en la
región proximal. Este es el primer registro de una especie de Tereancistrum en región sudeste de Brasil