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Oswaldo Palenzuela - One of the best experts on this subject based on the ideXlab platform.
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Endolimax piscium sp nov amoebozoa causative agent of systemic granulomatous disease of cultured sole solea senegalensis kaup
Journal of Fish Diseases, 2014Co-Authors: Maria Constenla, Francesc Padros, Oswaldo PalenzuelaAbstract:A new amoeba species pathogenic for Senegalese sole is described based on ultrastructural analysis and SSU rDNA phylogenetic inference. The parasite presents round to ovoid trophozoites (<5 μm) with a high degree of intracellular simplification. No mitochondria were observed, but mitosome-like organelles were present. No cysts could be detected. Phylogenetic analysis confirmed the Senegalese sole parasite as an amitochondriate Archamoeba related to Endolimax nana and Iodamoeba spp., and we tentatively describe it as a new species in the genus Endolimax, Endolimax piscium. However, the genetic distance with E. nana is quite large, with only 60% pairwise identity between both SSU rDNA genotypes. Although the overall topology of the Archamoebae cladograms containing E. piscium was consistent, the support for the branching of Endolimax spp. relative to its closest neighbours was variable, being higher with distance or parsimony-based inference methods than with ML or Bayesian trees. The use of stringent alignment sampling masks also caused instability and reduced support for some branches, including the monophyly of Endolimax spp. in the most conservative data sets. The characterization of other Archamoebae parasitizing fish could help to clarify the status of E. piscium and to interpret the large genetic distance observed between Endolimax species.
Maria Constenla - One of the best experts on this subject based on the ideXlab platform.
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Endolimax piscium sp nov amoebozoa causative agent of systemic granulomatous disease of cultured sole solea senegalensis kaup
Journal of Fish Diseases, 2014Co-Authors: Maria Constenla, Francesc Padros, Oswaldo PalenzuelaAbstract:A new amoeba species pathogenic for Senegalese sole is described based on ultrastructural analysis and SSU rDNA phylogenetic inference. The parasite presents round to ovoid trophozoites (<5 μm) with a high degree of intracellular simplification. No mitochondria were observed, but mitosome-like organelles were present. No cysts could be detected. Phylogenetic analysis confirmed the Senegalese sole parasite as an amitochondriate Archamoeba related to Endolimax nana and Iodamoeba spp., and we tentatively describe it as a new species in the genus Endolimax, Endolimax piscium. However, the genetic distance with E. nana is quite large, with only 60% pairwise identity between both SSU rDNA genotypes. Although the overall topology of the Archamoebae cladograms containing E. piscium was consistent, the support for the branching of Endolimax spp. relative to its closest neighbours was variable, being higher with distance or parsimony-based inference methods than with ML or Bayesian trees. The use of stringent alignment sampling masks also caused instability and reduced support for some branches, including the monophyly of Endolimax spp. in the most conservative data sets. The characterization of other Archamoebae parasitizing fish could help to clarify the status of E. piscium and to interpret the large genetic distance observed between Endolimax species.
Leslie A Knapp - One of the best experts on this subject based on the ideXlab platform.
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parasite prevalence abundance and diversity in a semi free ranging colony of mandrillus sphinx
International Journal of Primatology, 2007Co-Authors: Joanna M. Setchell, Jean E Wickings, Issaben Bedjabaga, Benoit Goossens, Patricia Reed, Leslie A KnappAbstract:We examined parasite prevalence, abundance of protozoan cysts and helminth eggs in the feces, and number of parasitic taxa in a population of mandrills (Mandrillus sphinx) in semi-free-ranging conditions in their habitat range, with respect to the annual cycle, sex, age, dominance rank, and female reproductive status. We identified 3 taxa of amebic protozoa (Entamoeba coli, E. histolytica/dispar complex, and Endolimax nana), 1 ciliate protozoa (Balantidium coli), and various nematodes. Prevalence ranged from 1 observation in 874 samples for Trichuris and Mammomonogamus (nematodes) to 100% for Entamoeba coli and Endolimax nana. Daily observation, consistency of fecal samples, and periodic veterinary examination indicated that the mandrills were all healthy, suggesting that the presence of intestinal parasites in the provisioned population is well tolerated. Parasite prevalence, abundance in the feces, and number of taxa varied significantly across the annual cycle. Nematode egg prevalence and abundance were lowest during the dry season. We found no sexual difference and no influence of female dominance rank on parasitic infections. Nematode prevalence increased significantly with age in females, but not in males. There was no influence of age on prevalence of other taxa, abundance in the feces, or number of taxa. Abundance of nematode eggs in the feces was higher in pregnant than in lactating or cycling females. However, births are seasonal in the mandrill colony, and pregnant females were present during the months when nematode egg abundance was also higher in males, suggesting that this may be an influence of climatic seasonality in addition to, or instead of, female status.
Constenla Matalobos María - One of the best experts on this subject based on the ideXlab platform.
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Contributions to the knowledge of a new disease caused by an amoeba in ongrowing Senegalese sole, Solea senegalensis (Kaup 1858)
Universidad Autónoma de Barcelona, 2014Co-Authors: Constenla Matalobos MaríaAbstract:A previously undescribed pathological condition is affecting the culture of Solea senegalensis in some farms of the Atlantic coast of Spain. This condition is characterised by the presence of external protuberances in the skin of the affected fish. These lesions correspond to nodules in the muscular tissue showing an abscess-like aspect. Similar lesions were found in kidney, heart, liver and the digestive tract, which leads us to define this pathology as a systemic disease. Histological sections of these nodules revealed the presence of a large core formed mainly of necrotic tissue surrounded with fibroblasts and macrophages. Round-shaped plasmodial organisms were found in the external layer of the nodules and usually inside macrophages or fibroblasts. These organisms were also observed in the intestinal mucosa and submucosa, without causing apparent lesions. This organisms are correspond to a new amoeba species, that belongs to the family Entamoebidae (Phylum Amebozoa, Infraphylum Archamoeba), and we tentatively describe it as a new species in the genus Endolimax, Endolimax piscium n. sp. E. piscium presents round to ovoid trophozoites (
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Contributions to the knowledge of a new disease caused by an amoeba in ongrowing Senegalese sole, Solea senegalensis (Kaup 1858)
'Universitat Autonoma de Barcelona', 2013Co-Authors: Constenla Matalobos MaríaAbstract:la costa atlántica de España. Esta patología se caracteriza por la presencia de protuberancias que se evidencian a través de la piel de los peces afectados. Estas lesiones se corresponden con nódulos en el tejido muscular, que muestran un aspecto de absceso. Lesiones similares a éstas también se han detectado en riñón, corazón, hígado y tracto digestivo, lo que nos permite definir la enfermedad como sistémica. Las secciones histológicas de los nódulos revelaron un extenso núcleo compuesto mayoritariamente por tejido necrótico rodeado por fibroblastos y macrófagos. Además, organismos plasmodiales de morfología esférica se encontraron en la capa externa de estos nódulos, normalmente en el interior de macrófagos o fibroblastos. Estos organismos también se observaron en la mucosa y submucosa intestinal, sin causar lesiones aparentes. En este trabajo se ha podido identificar a estos organismos como una nueva especie de ameba perteneciente a la familia Entamoebidae (Phylum Amebozoa, Infraphylum Archamoeba), y se describe tentativamente como una nueva especie del género Endolimax, Endolimax piscium n. sp. E. piscium presenta trofozoitos redondeados (
Francesc Padros - One of the best experts on this subject based on the ideXlab platform.
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Endolimax piscium sp nov amoebozoa causative agent of systemic granulomatous disease of cultured sole solea senegalensis kaup
Journal of Fish Diseases, 2014Co-Authors: Maria Constenla, Francesc Padros, Oswaldo PalenzuelaAbstract:A new amoeba species pathogenic for Senegalese sole is described based on ultrastructural analysis and SSU rDNA phylogenetic inference. The parasite presents round to ovoid trophozoites (<5 μm) with a high degree of intracellular simplification. No mitochondria were observed, but mitosome-like organelles were present. No cysts could be detected. Phylogenetic analysis confirmed the Senegalese sole parasite as an amitochondriate Archamoeba related to Endolimax nana and Iodamoeba spp., and we tentatively describe it as a new species in the genus Endolimax, Endolimax piscium. However, the genetic distance with E. nana is quite large, with only 60% pairwise identity between both SSU rDNA genotypes. Although the overall topology of the Archamoebae cladograms containing E. piscium was consistent, the support for the branching of Endolimax spp. relative to its closest neighbours was variable, being higher with distance or parsimony-based inference methods than with ML or Bayesian trees. The use of stringent alignment sampling masks also caused instability and reduced support for some branches, including the monophyly of Endolimax spp. in the most conservative data sets. The characterization of other Archamoebae parasitizing fish could help to clarify the status of E. piscium and to interpret the large genetic distance observed between Endolimax species.