Morphological records of oocyte maturation in the parthenogenetic tick Amblyomma rotundatum Koch, 1844 (Acari: Ixodidae)

Author(s)

Sanches, Gustavo S. ^[1] ; Araujo, Andrea M. ^[1] ; Martins, Thiago F. ^[2] ; Bechara, Gervasio H. ^[3] ; Labruna, Marcelo B. ^[2] ; Camargo-Mathias, Maria I. ^[1]

Affiliation

^[1] UNESP, Inst Biociencias, Dept Biol, BR-13506900 Rio Claro, SP - Brazil

^[2] Univ Sao Paulo, FMVZ, Dept Med Vet Prevent & Saude Anim, BR-05508270 Sao Paulo, SP - Brazil

^[3] UNESP, FCAV, Dept Vet Pathol, BR-14884900 Jaboticabal, SP - Brazil

• Document type: Journal article
• Source: TICKS AND TICK-BORNE DISEASES; v. 3, n. 1, p. 59-64, 2012.
• Web of Science Citations: 5

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-Ill 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. (C) 2011 Elsevier GmbH. All rights reserved. (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