Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Oocyte maturation in the sloth's giant tick Amblyomma varium (Acari: Ixodidae) in an ecological context

Full text
Sanches, Gustavo S. [1] ; Andre, Marcos R. [2] ; do Prado, Angelo P. [3] ; Allegretti, Silmara M. [3] ; Remedio, Rafael N. [1] ; Nunes, Pablo H. [1] ; Machado, Rosangela Z. [2] ; Bechara, Gervasio H. [2] ; Camargo-Mathias, Maria I. [1]
Total Authors: 9
[1] UNESP, Inst Biociencias, Dept Biol, BR-13506900 Rio Claro, SP - Brazil
[2] UNESP, Lab Imunopatol, Dept Patol Vet, BR-14884900 Jaboticabal, SP - Brazil
[3] Univ Estadual Campinas UNICAMP, Dept Biol Anim, Inst Biol, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Experimental and Applied Acarology; v. 64, n. 4, p. 519-531, DEC 2014.
Web of Science Citations: 2

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. (AU)

FAPESP's process: 10/00415-8 - Biological and morphological (external and reproductive system of males) comparison of Rhipicephalus sanguineus (Latreille, 1806) from Brazil and Rhipicephalus turanicus Pomerantsev, 1936 (Acari: Ixodidae) from Spain
Grantee:Gustavo Seron Sanches
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 13/10394-6 - Immunogenic Potential of the Ribosomal Protein P0 Against the Tick Rhipicephalus sanguineus (Acari:Ixodidae)in Dogs
Grantee:Gustavo Seron Sanches
Support Opportunities: Scholarships in Brazil - Post-Doctoral