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Isospora coerebae Berto, Flausino, Luz, Ferreira Lopes, 2010 is a coccidian protozoan described from bananaquits Coereba flaveola (Linnaeus, 1758), on Marambaia Island, which is located on the southeastern Brazilian coast. In this current work, I. coerebae is identified from C. flaveola in a protected area close to Marambaia Island, but on the mainland, establishing a new location of parasitism, in addition to providing a preliminary genotypic characterization via sequencing of two regions of the mitochondrial cytochrome c oxidase subunit 1 (COI) gene. Its oocysts are sub-spherical, 24.4 22.9 m, with smooth, bilayered wall, ~1.7 m thick. Micropyle, polar granules and oocyst residuum are absent. Sporocysts are elongate ovoidal, 17.6 10.5 m. Stieda body prominent and rounded and sub-Stieda body short and wide. Sporocyst residuum is composed of scattered granules of different sizes. Sporozoites are vermiform with a prominent posterior refractile body. The oocysts of the current work are morphologically equivalent to the original description of I. coerebae, which have a typical and easily identifiable morphology, mainly in the Stieda and Sub-Stieda bodies. The two sequenced gene regions of the COI gene approximated I. coerebae to Isospora spp. from Southeastern Brazil, but also from Isospora spp. from passerines of North America, Europe and Asia. Although there is a small overlap between the two genic regions sequenced in the current work, it is estimated that the longer COI sequence, which was recently designed and still not widespread, should show better phylogenetic results in the future.

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BACKGROUND: Eimeria spp. are coccidian protozoan parasites of domestic and wild animals. Pelecaniform birds are hosts of some Eimeria spp., however, from the family Threskiornithidae only one eimerian species is recorded, Eimeria bazi Chauhan et Bhatia, 1970 which was described from red-naped ibises Pseudibis papillosa (Temminck, 1824) in India. In this study, in turn, this species is morphologically and molecularly identified from buff-necked ibises Theristicus caudatus (Boddaert, 1783) in Brazil. PURPOSE: This study aimed to report E. bazi from buff-necked ibises T. caudatus in southeastern Brazil, revealing the worldwide distribution of this coccidian species, in addition to providing preliminary genotypic identification via sequencing of the mitochondrial cytochrome c oxidase subunit 1 (COI) gene. METHODS: A total of 73 fecal samples were collected from a flock of buff-necked ibises, which remained on the campus of the Federal Rural University of Rio de Janeiro (Universidade Federal Rural do Rio de Janeiro-UFRRJ) from March 2019 to August 2020. Fecal samples were processed by the Sheather's method to recover oocysts. The morphological and morphometrical studies of the oocysts were performed using an optical microscope and graphic editing software. Molecular analysis was performed by sequencing of the COI gene, and the phylogenetic analysis was based in the neighbor-joining and maximum likelihood estimates. RESULTS: Forty-five fecal samples were positive for oocysts identified as E. bazi. This oocysts are ovoidal, 26.2 × 18.9 µm, with smooth to slightly rough wall, c.1.7 µm thick. Micropyle robust and protruding, sometimes with a polar body attached. Oocyst residuum absent, but one or two small polar granules are present. Sporocysts ovoidal to lemon-shaped, 14.2 × 8.7 µm. The Stieda body is knob-like to rounded and sub-Stieda body is absent or vestigial. Sporocyst residuum is composed of granules often membrane-bound. Sporozoites are vermiform, with refractile bodies. This morphology was consistent with the original description of E. bazi from P. papillosa in India. Molecular analysis at the COI gene exhibited low similarity with coccidians sequenced for the same genic region deposited in GenBank, sitting E. bazi separately on the cladogram. CONCLUSIONS: The morphological and molecular studies support the identification of E. bazi from T. caudatus in South America, thus revealing the wide distribution of this eimerian species in the world provided by migratory birds and/or with intercontinental distribution.

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Parasitism in kingfishers is very little reported and predominantly related to hemoparasites, helminths, and ectoparasites. The present study provided a morphological and genotypic study of an Eimeria sp. recovered from a green kingfisher Chloroceryle americana (Gmelin, 1788) captured in the Marambaia Island, on the coast of the state of Rio de Janeiro, Southeastern Brazil. The coccidial density, some morphological aspects of its oocysts, the molecular results, and, mainly, the ecological niche of C. americana in the mangrove of the Marambaia Island suggest that this coccidian species is a pseudoparasite.

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In the present study Isospora feroxis Berto, Luz, Flausino, Ferreira & Lopes, 2009 is redescribed from the photosyntypes and from new samples from a short-crested flycatcher Myiarchus ferox (Gmelin), which is the type-host in the type-locality, the Marambaia Island in Southeastern Brazil. In addition, the yellow-olive flycatcher Tolmomyias sulphurescens Spix is recorded as a new host for this species, in a new locality, the Itatiaia National Park, in the interior of Southeastern Brazil, providing a preliminary genotypic characterization via sequencing of the mitochondrial cytochrome c oxidase subunit 1 (COI) gene. Micropyle and rough oöcyst wall are added to the description of I. feroxis, in addition to other details. This is the sixth species identified from suboscine birds (Tyranni) to have a COI gene sequence deposited in GenBank and, although it is not yet possible to make conclusions on the phylogeny of Isospora spp. from Passeriformes by the COI gene, the molecular analysis confirmed the differences between coccidian species from tyrant-flycatchers.

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Woodcreepers are passerines of the family Dendrocolaptidae, which have a high forest dependency. The current work aimed to redescribe Isospora striata McQuistion et al. 1997, from two new hosts in protected areas in Brazil, revealing new localities of parasitism, in addition to providing preliminary genotypic identifications via sequencing of the mitochondrial cytochrome c oxidase subunit 1 (COI) gene from both host species. Isospora striata has oocysts that are subspheroidal to ovoidal, 19.4 × 16.8 µm with smooth wall. Oocyst residuum is absent, but micropyle and polar granules are present. Sporocysts are ovoidal, 13.6 × 8.3 µm, with both Stieda and sub-Stieda bodies. Sporocyst residuum is present and sporozoites with refractile body, nucleus, and striations. The morphological study and the 100% similarity in sequencing of the COI gene between samples of different dendrocolaptid species confirmed the identification of a single species, supporting the identification of I. striata in the Brazilian Atlantic forest and consequently the wide distribution of this coccidian species in the Neotropical Region.

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Isospora parnaitatiaiensis Silva, Rodrigues, Lopes, Berto, Luz, Ferreira & Lopes, 2015 was identified from a new host, the plain antvireo Dysithamnus mentalis (Temminck), and also from the white-shouldered fire-eye Pyriglena leucoptera Vieillot, in its type-locality, the Itatiaia National Park in the southeastern Brazil, and a preliminary genotypic characterisation by sequencing the mitochondrial cytochrome c oxidase subunit 1 gene is provided. The oöcysts recovered from P. leucoptera and D. mentalis were polymorphic and have genotypic differences that were not considered sufficient for the description of new species, but only different genotypes and morphotypes of I. parnaitatiaiensis related to each host. These morphological and molecular variations were associated with a process of ongoing speciation and in adaptive development to their respective host species.

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BACKGROUND: Coccidia are obligatory intracellular parasites with at least one intestinal phase in their life cycles, being Isospora Schneider, 1881 the main coccidian genus related to the order Passeriformes. However, there is no record of isosporans from the passerine family Tityridae, which is the family of the greenish schiffornis Schiffornis virescens (Lafresnaye, 1838). PURPOSE: This study aimed to examine the faeces from a greenish schiffornis S. virescens captured in the Itatiaia National Park, State of Rio de Janeiro, Southeastern Brazil, to determine what coccidian parasites were present. METHODS: Only one specimen of Schiffornis virescens was captured with mist nets. Coccidian oocysts were recovered from the fecal samples by flotation in Sheather's saturated solution. Morphological observations, line drawings, photomicrographs and measurements were made in optical microscopy and digitally edited. The molecular analysis included the study of the sequence of the mitochondrial cytochrome c oxidase subunit 1 (COI) gene, with phylogenetic reconstructions based on the Neighbor-Joining and Maximum Likelihood analysis. RESULTS: An Isospora sp. considered as new to science is described and identified from Schiffornis virescens (Lafresnaye, 1838). Isospora oliveirai n. sp. has oocysts that are subspheroidal, 26.0 × 24.8 µm, with rough, bilayered wall, c.2.5 µm thick. Micropyle and oocyst residuum absent, but one to six polar granules are present. Sporocysts lemon-shaped, 18.1 × 10.9 µm. The Stieda body is knob-like to half-moon-shaped and sub-Stieda is rounded. Sporocyst residuum is present, composed of scattered spherules of different sizes. Sporozoites are vermiform, with refractile bodies and nucleus. Molecular analysis at the COI gene exhibited similarity of 97% with Isospora serinuse Yang, Brice, Elliot et Ryan, 2015 from island canaries Serinus canaria (Linnaeus, 1758), and Isospora spp. from great tits Parus major (Linnaeus, 1758) and European robins Erithacus rubecula (Linnaeus, 1758). CONCLUSION: Based on the morphological and molecular features, I. oliveirai is considered as new to science and the first coccidian species recorded from Tityridae.

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Coccidia (Chromista: Miozoa: Eimeriidae) of columbiform birds (Aves: Columbiformes) have been described since the end of the nineteenth century; however, some of these descriptions were poorly detailed or inconclusive. In this sense, the current work makes a detailed taxonomic revision reconsidering and organizing 18 Eimeria spp. and two Isospora spp. previously described or reported of Columbiformes. Along with this, a new species of Eimeria is morphologically and molecularly identified by the mitochondrial cytochrome c oxidase subunit 1 (COI) gene and by the 18S small subunit ribosomal RNA (18S) gene from the ruddy ground-dove Columbina talpacoti (Temminck, 1809) in the Médio Paraíba region of the State of Rio de Janeiro, southeastern Brazil. Eimeria columbinae n. sp. has subspheroidal oocysts, 14.7 × 13.2 µm, with smooth, bi-layered wall, ~ 1.1 µm and length/width ratio of 1.1. Micropyle and oocyst residuum are present, but polar granule is absent. Sporocysts are ellipsoidal to slightly asymmetrical, 9.0 × 5.1 µm, with both Stieda and sub-Stieda bodies. Sporocyst residuum present and sporozoites with refractile body and nucleus. This is the 19th description of an eimerian from Columbiformes in the World, and the second to have a molecular identification of the COI and 18S genes.

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In the current work, Isospora massardi Lopes, Berto, Luz, Galvão, Ferreira & Lopes, [10] is identified from white-necked thrushes Turdus albicollis Vieillot, 1818, rufous-bellied thrushes Turdus rufiventris Vieillot, 1818 and from a new host, the yellow-legged thrush Turdus flavipes (Vieillot, 1818) in a new locality, the Itatiaia National Park, in Southeastern Brazil, providing a preliminary genotypic characterization via sequencing of the mitochondrial cytochrome c oxidase subunit 1 (COI) and 18S small subunit ribosomal RNA genes. The oocysts and sporocysts of I. massardi of the current study are morphologically similar to the original description and are uniform in the proportionality of width on length, but exhibited different patterns of size associated with each host species. Furthermore, a genotypic difference of 3% was found in the COI sequences from T. flavipes and T. albicollis. Therefore, an ecological discussion is introduced aimed at associating these morphometric and genotypic differences with an ongoing speciation process.

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BACKGROUND: The gnateaters Conopophaga spp. are insectivorous passerines commonly observed in high and humid forests, where they remain lodged in thin branches and, sometimes, they fly to the ground to catch insects. The insectivorous feeding habit is related to low prevalence and density of coccidians in passerines; however, several coccidian species are recorded for families of insectivorous passerines. PURPOSE: This study aimed to examine the feces from gnateaters Conopophaga spp. captured in the municipality of Barra Mansa and in the Itatiaia National Park, State of Rio de Janeiro, Southeastern Brazil, to determine what coccidian parasites were present. METHODS: Nine gnateaters were captured with mist nets. Coccidian oocysts were recovered from the fecal samples by flotation in Sheather's saturated solution. Morphological observations, line drawings, photomicrographs and measurements were made in optical microscopy and digitally edited. The molecular analysis included the study of the sequence of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene, with phylogenetic reconstructions based on the neighbor-joining and maximum likelihood analysis. RESULTS: Four Conopophaga spp. were positive for oocysts. An Isospora sp. considered as new to science is described and identified from Conopophaga melanops (Vieillot, 1818) and Conopophaga lineata (Wied, 1831). Isospora borbai n. sp. has oocysts that are subspheroidal, 17-22 × 15-22 (20.2 × 19.1) µm, with rough, bilayered wall, c.1.7 µm thick. Micropyle present, but without micropyle cap. Oocyst residuum absent, but one or two polar granules are present. Sporocysts are ellipsoidal, 12-15 × 8-11 (14.1 × 9.1) µm. The Stieda body is knob-like to half-moon-shaped and sub-Stieda body is rounded. Sporocyst residuum is present, composed of scattered spherules of different sizes. Sporozoites are vermiform with refractile body and nucleus. Molecular analysis at the cox1 gene exhibited similarity greater than 99% with Isospora spp. isolates from other Neotropical passerine birds. CONCLUSION: Based on the morphological and molecular features, I. borbai is considered as new to science and the first coccidian species recorded from Conopophagidae.

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Isospora sporophilae Carvalho-Filho, Meireles, Ribeiro & Lopes, 2005 was morphologically and molecularly identified from the double-collared seedeater Sporophila frontalis (Verreaux), which is categorised as 'vulnerable' by the International Union for Conservation of Nature and Natural Resources (IUCN), and from the uniform finch Haplospiza unicolor Cabanis in conserved and anthropomorphic/fragmented areas of Atlantic Forest in the southeastern Brazil. The oöcysts recovered from S. frontalis and H. unicolor had small morphological and genotypic differences that were not considered sufficient for the description of new species, but only different genotypes of I. sporophilae related to each host. This coccidian species was originally described from double-collared seedeaters Sporophila caerulescens (Vieillot) in a center screening of wild animals; therefore, this new report emphasises a potential occurrence of anthropomorphic dispersion of coccidia through illegal trade, seizures and reintroductions in the wild.

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A new species of coccidia (Protozoa: Apicomplexa: Eimeriidae) found parasitizing the yellow-legged thrush Turdus flavipes (Vieillot, 1818), the pale-breasted thrush Turdus leucomelas Vieillot, 1818 and the creamy-bellied thrush Turdus amaurochalinus Cabanis, 1850 in Southeastern Brazil is described. Isospora brasilsatoae n. sp. has oocysts that are ovoidal to pyriform, 26.8 × 21.1 µm, with smooth, bilayered wall, ~1.6 µm thick. Micropyle present. Oocyst residuum absent, but one to three polar granules are present. Sporocysts are elongate ovoidal, 18.1 × 10.5 µm. Stieda body knob-like and sub-Stieda body trapezoidal. Sporocyst residuum is composed of granules that appear to be membrane-bounded. Sporozoites are vermiform with refractile bodies and striations. This is the ninth description of an Isospora sp. parasitizing a New World thrush.

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In the current study, Isospora sagittulae McQuistion and Capparella, 1992 (Protozoa: Apicomplexa: Eimeriidae) is reported from white-shouldered fire-eyes Pyriglena leucoptera (Vieillot, 1818) in the Atlantic Forest in southeastern Brazil. To date, this coccidian species was described from antbirds in Ecuador and Brazilian Amazon. In this sense, oocysts and measurements of the description of I. sagittulae from Amazonian antbirds were required from the deposit for comparison between samples from the Amazon and Atlantic Forest. The morphology was similar in all aspects, despite the polymorphism associated with the oocyst shape. DNA sequences for the mitochondrial cytochrome c oxidase subunit 1 (cox1) locus of the oocysts had similarity of 100%. Therefore, these strong morphological, molecular, and ecological equivalences ensure the unique identification of I. sagittulae. Finally, this finding reveals the wide distribution of I. sagittulae in the Neotropical region and indicates that other antbirds in the Brazilian Cerrado should disperse I. sagittulae to the Amazon and Atlantic Forest.

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Using track analysis and cladistic biogeography, we identified areas of endemism of hummingbirds in the Andean and Neotropical regions. Our results point out that the current areas of endemism of hummingbirds occur in the Andes, Guiana Shield, the Lesser Antilles, western Central and North America and the Chiapas Highlands. The cladistic biogeographic analysis suggests a hummingbird distribution shaped mainly by dispersal events.(AU)

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A new coccidian species parasitizing white-necked thrushes Turdus albicollis Vieillot, 1818 is described from the Parque Nacional do Itatiaia, in Southeastern Brazil. Isospora machadoae sp. nov. has oocysts that are sub-spherical, 22.2 × 21.2 µm, with bilayered wall, ~1.3 m thick. Outer layer is rough with micropyle and micropyle cap. Oocyst residuum is absent, but one or two polar granules are present. Sporocysts are ellipsoidal, 13.3 × 9.7 µm. The Stieda body is flattened to half-moon-shaped and substieda body rounded. Sporocyst residuum is present, composed of scattered spherules of different sizes. Sporozoites are vermiform with a refractile body and a nucleus. These parasitized thrushes had no apparent clinical signs of coccidiosis or high densities of oocysts in feces. This condition may be associated with a specific low pathogenicity of I. machadoae sp. nov. and/or with the conserved habitat of these birds, which ensures the ecological niches and thus the immunocompetence to wildlife.(AU)

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A new coccidian species parasitizing white-necked thrushes Turdus albicollis Vieillot, 1818 is described from the Parque Nacional do Itatiaia, in Southeastern Brazil. Isospora machadoae sp. nov. has oocysts that are sub-spherical, 22.2 × 21.2 µm, with bilayered wall, ~1.3 m thick. Outer layer is rough with micropyle and micropyle cap. Oocyst residuum is absent, but one or two polar granules are present. Sporocysts are ellipsoidal, 13.3 × 9.7 µm. The Stieda body is flattened to half-moon-shaped and substieda body rounded. Sporocyst residuum is present, composed of scattered spherules of different sizes. Sporozoites are vermiform with a refractile body and a nucleus. These parasitized thrushes had no apparent clinical signs of coccidiosis or high densities of oocysts in feces. This condition may be associated with a specific low pathogenicity of I. machadoae sp. nov. and/or with the conserved habitat of these birds, which ensures the ecological niches and thus the immunocompetence to wildlife.

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Using track analysis and cladistic biogeography, we identified areas of endemism of hummingbirds in the Andean and Neotropical regions. Our results point out that the current areas of endemism of hummingbirds occur in the Andes, Guiana Shield, the Lesser Antilles, western Central and North America and the Chiapas Highlands. The cladistic biogeographic analysis suggests a hummingbird distribution shaped mainly by dispersal events.

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The aim of the present study was to report and describe Isospora albicollis Lainson and Shaw, 1989 parasitizing a white-necked thrush Turdus albicollis Vieillot, 1818 and a pale-breasted thrush Turdus leucomelas Vieillot, 1818 in two different localities: the Itatiaia National Park and Cacaria, in southeastern Brazil. The oocysts identified were ovoidal, 24.4 × 19.7 m, with a smooth, bilayered wall, around 1.4 m thick. Oocyst residuum was absent, but a micropyle and a polar granule were present. The sporocysts were ellipsoidal, 15.4 × 10.1 m. The Stieda body was knob-like to rounded and the sub-Stieda body was prominent and wide. Sporocyst residuum was present, usually as a cluster of granules that appear to be membrane-bounded. The sporozoites were vermiform with one posterior refractile body and a centrally located nucleus. Besides recording the new host T. leucomelas, the identification of I. albicollis in the Itatiaia National Park and Cacaria, in southeastern Brazil, provide records of new localities for its parasitism, and reveals the wide distribution and dispersion of this coccidium in Brazil.(AU)

O objetivo do presente estudo foi relatar e descrever Isospora albicollis Lainson e Shaw, 1989, parasitando um sabiá-coleira Turdus albicollis Vieillot, 1818 e um sabiá-barranco Turdus leucomelas Vieillot 1818, em duas localidades diferentes: Parque Nacional do Itatiaia e Cacaria, no Sudeste do Brasil. Os oocistos identificados foram ovóides, 24,4 × 19,7 m, com uma parede lisa e dupla, com cerca de 1,4 m de espessura. Resíduo do oocisto foi ausente, mas uma micrópila e um grânulo polar foram presentes. Esporocistos elipsoidais, 15,4 × 10,1 m, corpo de Stieda em forma de botão a arredondado e corpo de sub-Stieda proeminente e largo. Resíduo do esporocisto presente, usualmente como um aglomerado de grânulos que parecem estar envolvidos por uma membrana. Esporozoítos vermiformes com um corpo refráctil posterior e um núcleo centralizado. Além de registrar o novo hospedeiro T. leucomelas, a identificação de I. albicollis no Parque Nacional de Itatiaia e Cacaria, no Sudeste do Brasil, fornece registros de novas localidades para seu parasitismo e revela a ampla distribuição e dispersão desse coccídio no Brasil.(AU)

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Abstract The aim of the present study was to report and describe Isospora albicollis Lainson and Shaw, 1989 parasitizing a white-necked thrush Turdus albicollis Vieillot, 1818 and a pale-breasted thrush Turdus leucomelas Vieillot, 1818 in two different localities: the Itatiaia National Park and Cacaria, in southeastern Brazil. The oocysts identified were ovoidal, 24.4 × 19.7 μm, with a smooth, bilayered wall, around 1.4 μm thick. Oocyst residuum was absent, but a micropyle and a polar granule were present. The sporocysts were ellipsoidal, 15.4 × 10.1 μm. The Stieda body was knob-like to rounded and the sub-Stieda body was prominent and wide. Sporocyst residuum was present, usually as a cluster of granules that appear to be membrane-bounded. The sporozoites were vermiform with one posterior refractile body and a centrally located nucleus. Besides recording the new host T. leucomelas, the identification of I. albicollis in the Itatiaia National Park and Cacaria, in southeastern Brazil, provide records of new localities for its parasitism, and reveals the wide distribution and dispersion of this coccidium in Brazil.

Resumo O objetivo do presente estudo foi relatar e descrever Isospora albicollis Lainson e Shaw, 1989, parasitando um sabiá-coleira Turdus albicollis Vieillot, 1818 e um sabiá-barranco Turdus leucomelas Vieillot 1818, em duas localidades diferentes: Parque Nacional do Itatiaia e Cacaria, no Sudeste do Brasil. Os oocistos identificados foram ovóides, 24,4 × 19,7 μm, com uma parede lisa e dupla, com cerca de 1,4 μm de espessura. Resíduo do oocisto foi ausente, mas uma micrópila e um grânulo polar foram presentes. Esporocistos elipsoidais, 15,4 × 10,1 μm, corpo de Stieda em forma de botão a arredondado e corpo de sub-Stieda proeminente e largo. Resíduo do esporocisto presente, usualmente como um aglomerado de grânulos que parecem estar envolvidos por uma membrana. Esporozoítos vermiformes com um corpo refráctil posterior e um núcleo centralizado. Além de registrar o novo hospedeiro T. leucomelas, a identificação de I. albicollis no Parque Nacional de Itatiaia e Cacaria, no Sudeste do Brasil, fornece registros de novas localidades para seu parasitismo e revela a ampla distribuição e dispersão desse coccídio no Brasil.

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The aim of the present study was to report and describe Isospora albicollis Lainson and Shaw, 1989 parasitizing a white-necked thrush Turdus albicollis Vieillot, 1818 and a pale-breasted thrush Turdus leucomelas Vieillot, 1818 in two different localities: the Itatiaia National Park and Cacaria, in southeastern Brazil. The oocysts identified were ovoidal, 24.4 × 19.7 µm, with a smooth, bilayered wall, around 1.4 µm thick. Oocyst residuum was absent, but a micropyle and a polar granule were present. The sporocysts were ellipsoidal, 15.4 × 10.1 µm. The Stieda body was knob-like to rounded and the sub-Stieda body was prominent and wide. Sporocyst residuum was present, usually as a cluster of granules that appear to be membrane-bounded. The sporozoites were vermiform with one posterior refractile body and a centrally located nucleus. Besides recording the new host T. leucomelas, the identification of I. albicollis in the Itatiaia National Park and Cacaria, in southeastern Brazil, provide records of new localities for its parasitism, and reveals the wide distribution and dispersion of this coccidium in Brazil.

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