Morphological, histological, and ultrastructural studies of the ovary of the cattle-tick Boophilus microplus (Canestrini, 1887) (Acari: Ixodidae).
This study presents the morphology of the ovary, as well as the dynamics of the vitellogenesis process in oocytes of the cattle-tick Boophilus microplus. The ovary of these individuals is of the panoistic type; therefore, it lacks nurse cells. This organ consists of a single tubular structure, continuous, and composed of a lumen delimitated by a wall of small epithelial cells with rounded nuclei. In this tick species, the oocytes were classified into six stages varying from I to VI and according to: cytoplasm appearance and presence of the germ vesicle, yolk granules, and chorion. Oocytes of various sizes and at different developmental stages remain attached to the ovary through a cellular pedicel until completing stage V. Afterwards, they are liberated into the lumen and from there to the exterior. Some oocytes (classified as type VI) showed an atypical appearance indicating that some of the cellular components would be undergoing a degenerative process and/or reabsorption.
Saito
Kelly Cristina
KC
Departamento de Biologia, I.B., Universidade Estadual Paulista Júlio de Mesquita Filho, Av. 24 A, No. 1515 Cx, Postal 199, CEP 13506-900, Rio Claro, SP, Brasil.
Bechara
Gervásio Henrique
GH
Nunes
Erika Takagi
ET
de Oliveira
Patricia Rosa
PR
Denardi
Sandra Eloisi
SE
Mathias
Maria Izabel Camargo
MI
D000818:Animals; D005260:Female; D006651:Histocytochemistry; D026863:Ixodidae / Q000033:anatomy & histology* / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009865:Oocytes / Q000648:ultrastructure*; D010053:Ovary / Q000033:anatomy & histology* / Q000648:ultrastructure; D014818:Vitellogenesis / Q000502:physiology