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de Santana Miglionico MT, Viana LA, Barbosa HS, Mota EM, da Costa Neto SF, D'Andrea PS, Frazão-Teixeira E. Three new species of Eimeria Schneider 1875 in the montane grass mouse, Akodon montensis (Rodentia: Cricetidae: Sigmodontinae), and redescription of Eimeria zygodontomyis Lainson and Shaw 1990 from southeastern Brazil. Parasitol Res 2019; 119:291-298. [PMID: 31820167 DOI: 10.1007/s00436-019-06531-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 10/28/2019] [Indexed: 10/25/2022]
Abstract
We describe three new coccidian species of the genus Eimeria Schneider 1875 (Apicomplexa: Eimeriidae) and redescribe and report Eimeria zygodontomyis Lainson and Shaw, 1990 in the montane grass mouse, Akodon montensis Thomas, 1913 from the Serra dos Órgãos National Park in southeastern Brazil. Sporulated oocysts of Eimeria zygodontomyis are ellipsoidal to cylindrical with a 0.6 (0.5-0.8) μm thick very delicate bi-layered wall; length × width (n = 49) 18.3 × 12.5 (16-20 × 11-13) μm; length/width ratio of 1.4 (1.2-1.6); 1 polar granule occasionally present; micropyle, residuum both absent. Sporocysts are ellipsoidal; length × width 8.5 × 5.2 (8-11 × 5-6) μm; length/width ratio of 1.5 (1.3-1.7) μm; Stieda body is prominent; sub-Stieda body is absent; sporocyst residuum is compact. Sporulated oocysts of Eimeria montensis n. sp. are spheroidal to subspheroidal with a 1.2 (1.0-1.4) μm thick bi-layered wall; outer layer lightly pitted; length × width (n = 30) 16.3 × 12.5 (15-17 × 13-15) μm; length/width ratio of 1.3 (1.0-1.4); 1 polar granule present; micropyle, residuum both absent. Sporocysts are ellipsoidal; length × width 7.2 × 5.1 (6-8 × 4-6) μm; length/width ratio of 1.4 (1.2-1.6); Stieda body is present, sub-Stieda body is absent; sporocyst residuum consists of small, scattered granules. Sporulated oocysts of Eimeria uricanensis n. sp. are ovoidal to pyriform with a 1.4 ( 1.3-1.6) μm thick bi-layered wall; outer layer lightly pitted; length × width (n = 40) 26.6 × 18.6 (23-30 × 17-20) μm; length/width ratio of 1.4 (1.3-1.6); 1 polar granule present; micropyle, residuum both absent. Sporocysts are ellipsoidal, length × width 13.3 × 8.0 (10-16 × 7-9) μm; length/width ratio of 1.7 (1.5-1.9); Stieda body, sub-Stieda body both absent; sporocyst residuum consists of a cluster of granules, forming a spheroid mass. Sporulated oocysts of Eimeria parnasiensis n. sp. are subspheroidal to ellipsoidal with a 1.8 ( 1.3-2.4) μm thick bi-layered wall; outer layer lightly pitted; length × width (n = 54) 28.2 × 21.9 (26-32 × 19-28) μm; length/width ratio of 1.3 (1.2-1.4); 1 polar granule present; micropyle is absent; oocyst residuum is present and consists of a cluster of granules of varying thickness. Sporocysts are ovoidal, tapering towards the Stieda body; length × width 12.2 × 7.6 (10-13 × 6-9) μm; length/width ratio of 1.6 (1.4-1.9); Stieda body is present; sub-Stieda body is absent; sporocyst residuum is present and consists of an aggregate of thin granules.
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Affiliation(s)
- Marcos Tobias de Santana Miglionico
- Graduate Program in Biodiversity and Health, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil. .,Laboratory of the Biology and Parasitology of Wild Mammal Reservoirs (LABPMR), Instituto Oswaldo Cruz/Fundad Parasitology o, Rio de Janeiro, RJ, 21040-360, Brazil.
| | - Lúcio André Viana
- Department of Biological Sciences and Health, Universidade Federal do Amapá, Macapá, AP, 68903-419, Brazil
| | - Helene Santos Barbosa
- Laboratory of Structural Biology, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil
| | - Ester Maria Mota
- Laboratory of Pathology, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil
| | - Sócrates Fraga da Costa Neto
- Graduate Program in Biodiversity and Health, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil.,Laboratory of the Biology and Parasitology of Wild Mammal Reservoirs (LABPMR), Instituto Oswaldo Cruz/Fundad Parasitology o, Rio de Janeiro, RJ, 21040-360, Brazil
| | - Paulo Sergio D'Andrea
- Graduate Program in Biodiversity and Health, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil.,Laboratory of the Biology and Parasitology of Wild Mammal Reservoirs (LABPMR), Instituto Oswaldo Cruz/Fundad Parasitology o, Rio de Janeiro, RJ, 21040-360, Brazil
| | - Edwards Frazão-Teixeira
- Graduate Program in Biodiversity and Health, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil.,Laboratory of Structural Biology, Instituto Oswaldo Cruz/Fundação Oswaldo Cruz, Rio de Janeiro, RJ, 21040-360, Brazil
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Araújo NP, Bonvicino C, Svartman M. Comparative cytogenetics of four species of Thrichomys (Rodentia: Echimyidae). Genome 2018; 62:31-41. [PMID: 30481091 DOI: 10.1139/gen-2018-0147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Thrichomys Trouessart, 1880 is a genus of echimyid rodents endemic to South America, distributed from northeastern Brazil to Paraguay and Bolivia. Although all the recognized species of this genus have already been karyotyped, detailed comparative cytogenetic analyses have not been performed yet. We karyologically analyzed four species of Thrichomys from different Brazilian states. Our analyses included GTG- and CBG-banding, silver-staining of the nucleolar organizer regions (Ag-NORs), and fluorescent in situ hybridization (FISH) with telomeric and 45S rDNA probes. Comparative GTG-banding suggested that the interspecific variation may result from Robertsonian rearrangements, pericentric and paracentric inversions, centromere repositioning, and heterochromatin variation. FISH with a telomeric probe showed interspecies variation in interstitial telomeric sequences (ITs) distribution. Our results represent the most complete data on the cytogenetics of Thrichomys reported to date and give an insight into the chromosome evolution of this genus.
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Affiliation(s)
- Naiara Pereira Araújo
- a Laboratório de Citogenômica Evolutiva, Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos, 6627 - Pampulha, 31270-901, Belo Horizonte, MG, Brazil
| | - Cibele Bonvicino
- b Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Fiocruz, e Divisão de Genética, INCA, Rio de Janeiro, RJ, Brazil
| | - Marta Svartman
- a Laboratório de Citogenômica Evolutiva, Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos, 6627 - Pampulha, 31270-901, Belo Horizonte, MG, Brazil
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