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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Sanches, Gustavo S. André, Marcos R. Do Prado, Angelo P. Allegretti, Silmara M. Remedio, Rafael N. Nunes, Pablo H. Machado, Rosangela Z. Bechara, Gervásio H. Camargo-Mathias, Maria I. |
| Spatial Coverage | Brazil |
| Description | Author Affiliation: Sanches GS ( Departamento de Biologia, Instituto de Biociências, UNESP, Campus Rio Claro, Av. 24 8 A, No. 1515, Cx. Postal 199, Rio Claro, SP, 13506-900, Brazil, gustavoseron@hotmail.com.) |
| Abstract | The sloth's giant tick Amblyomma varium Koch, which is a neotropical species that inhabits tropical rainforests, is the largest tick reported to date. The adult stage of this tick parasitizes mammals from the families Bradypodidae and Magalonychidae (Xenarthra) nearly exclusively. This study aimed to describe morphological and histological features of the reproductive system and the oocyte maturation process of this tick species. The ovary of A. varium is a long single tubular organ that is horseshoe-shaped, winding and arranged in the posterior part of the body. Two oviducts are connected to the ovary on each side; these thicken at certain region forming the uterus (common oviduct), followed by a muscular connecting tube, vagina and genital aperture. A large number of oocytes at different stages of development are attached to the ovary wall by the pedicel, as they reach maturity they are released into the ovary lumen and from there to the genital aperture. These oocytes develop simultaneously and asynchronically along the ovary. Amblyomma varium oocytes were classified into five development stages (i.e., I-V), and specific characteristics were observed; the processes of yolk and chorion deposition begin early in oocytes stage II, and oocytes V exhibit a very thick chorion and eggs of a large size. These characteristics are likely adaptations that enhance the survival and the reproductive success of this extremely host-specific tick, which is limited to a particular environment. |
| File Format | HTM / HTML |
| ISSN | 01688162 |
| Issue Number | 4 |
| Volume Number | 64 |
| e-ISSN | 15729702 |
| Journal | Experimental and Applied Acarology |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2014-12-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Parasitology Discipline Zoology Ixodidae Anatomy & Histology Sloths Parasitology Animals Brazil Female Histocytochemistry Ultrastructure Microscopy, Electron, Scanning Microscopy, Electron, Transmission Oocytes Ovary Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Medicine Insect Science |
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