Morphological records of oocyte maturation in the parthenogenetic tick Amblyomma rotundatum Koch, 1844 (Acari: Ixodidae) |
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| Authors: | Gustavo S Sanches Andrea M Araujo Thiago F Martins Gervásio H Bechara Marcelo B Labruna Maria I Camargo-Mathias |
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| Institution: | 1. Departamento de Biologia, Instituto de Biociências, UNESP, Av. 24 A, no. 1515, Cx. Postal 199, Rio Claro, SP 13506-900, Brazil;2. Departamento de Patologia Veterinária, FCAV, UNESP, Via de Acesso Prof. Paulo Castellane, s/n, Jaboticabal, SP 14884-900, Brazil;3. Departamento de Medicina Veterinária Preventiva e Saúde Animal, FMVZ, USP, Av. Prof. Orlando Marques de Paiva, 87, São Paulo, SP 05508-270, Brazil;1. Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela and Consejo Nacional de Investigaciones Científicas y Técnicas, CC 22, CP 2300 Rafaela, Santa Fe, Argentina;2. Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Av. Prof. Orlando M. de Paiva 87, 05508-900 São Paulo, Brazil;3. Laboratorio de Virologia Molecular, Regional Norte-Salto, Universidad de la República, Salto, Uruguay;4. Laboratorio de Vectores y Enfermedades Transmitidas and Departamento de Parasitología Veterinaria, Facultad de Veterinaria, Universidad de la República, Regional Norte-Salto, Rivera 1350, CP 50000 Salto, Uruguay;1. Department of Preventive Veterinary Medicine, College of Veterinary Medicine, Universidade Estadual de Londrina, Londrina, PR, 86051-990, Brazil;2. Department of Veterinary Medicine, Universidade Federal do Paraná, Curitiba, PR, 80035-050, Brazil;3. Department of Preventive Veterinary and Animal Health, College of Veterinary Medicine, University of São Paulo, São Paulo, SP, 05508-270, Brazil;4. Department of Clinics, Surgery and Animal Reproduction, College of Veterinary Medicine, São Paulo State University at Araçatuba, SP, 16050-680, Brazil;1. Laboratorio de Acarología, Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México, Distrito Federal, México;2. Laboratorio de Inmunoparasitología, Unidad de Investigación en Medicina Experimental, Facultad de Medicina, Universidad Nacional Autónoma de México, Distrito Federal, México;3. Centro de Medicina Tropical, Unidad de Investigación en Medicina Experimental, Facultad de Medicina, Universidad Nacional Autónoma de México, Distrito Federal, México;4. Laboratorio de Vectores y Enfermedades Transmitidas, Facultad de Veterinaria, CENUR Litoral Norte, Universidad de la República, Salto, Uruguay;5. Departamento de Medicina Veterinaria Preventiva e Saude Animal, Faculdade de Medicina Veterinaria e Zootecnia, Universidade de Sao Paulo, Sao Paulo, Brazil;1. Centro de Investigación en Enfermedades Tropicales and Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica;2. Centro de Investigación en Estructuras Microscópicas, Universidad de Costa Rica, San José, Costa Rica;3. Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, Brazil;1. Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Av. Prof. Orlando M. de Paiva 87, 05508-900 São Paulo, Brazil;2. Laboratorio de Vectores y enfermedades transmitidas and Departamento de Parasitología Veterinaria, Facultad de Veterinaria, Universidad de la República, CENUR Litoral Norte, Rivera 1350, CP 50000 Salto, Uruguay;3. DILAVE Miguel C. Rubino, Laboratorio Regional Este, Avelino Miranda 2045, CP 33000 Treinta y Tres, Uruguay;1. Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Consejo Nacional de Investigaciones Científicas y Técnicas, CC 22, CP 2300 Rafaela, Santa Fe, Argentina;2. Faculdade de Medicina Veterinaria, Universidade Federal de Uberlandia, Av. Pará 1720, Campus Umuarama-Bloco 2T, 38400-902 Uberlandia, Minas Gerais, Brazil;3. Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, Kreder 2805, CP 3080 Esperanza, Santa Fe, Argentina;4. Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Av. Prof. Orlando M. de Paiva 87, 05508-900 São Paulo, Brazil;5. United States National Tick Collection, Institute for Coastal Plain Science, Georgia Southern University, Statesboro, GA 30460, USA;6. Departamento de Patología Animal, Facultad de Veterinaria, Universidad de Zaragoza, Miguel Servet 177, 50013 Zaragoza, Spain |
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| Abstract: | Oocyte maturation in the thelytokous parthenogenetic tick Amblyomma rotundatum was examined for the first time using light and scanning electron microscopy. The panoistic ovary lacks nurse and follicular cells and is a single continuous tubular structure forming a lumen delimited by the ovarian wall. Oocytes of tick species are usually classified according to cytoplasm appearance, the presence of germinal vesicle, the presence of yolk granules, and the chorion. However, for this species, we also use oocyte size as an auxiliary tool since most oocytes were in stages I–III and were histologically very similar. Oocytes were classified into five development stages, and specific characteristics were observed: mature oocytes with thin chorion, pedicel cells arranged forming an epithelium with two or more oocytes attached by the same structure, and a large number of oocytes in the process of reabsorption. |
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