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

Dynamics of cell and tissue genesis in the male reproductive system of ticks (Acari: Ixodidae) Amblyomma cajennese (Fabricius, 1787) and Amblyomma aureolatum (Pallas, 1772): a comparative analysis

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Author(s):
Sampieri, Bruno Rodrigues [1] ; Labruna, Marcelo Bahia [2] ; Bueno, Odair Correa [1] ; Camargo-Mathias, Maria Izabel [1]
Total Authors: 4
Affiliation:
[1] UNESP, Rio Claro, SP - Brazil
[2] Univ Sao Paulo, BR-09500900 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Parasitology Research; v. 113, n. 4, p. 1511-1519, APR 2014.
Web of Science Citations: 4
Abstract

Ticks are classified into three families: Argasidae, Ixodidae, and Nutalliellidae. The taxonomy and phylogeny within Ixodidae are still discussed by the specialists, thus requiring further studies. Amblyomma cajennese and Amblyomma aureolatum (Brazil) belong to two species complexes known as ``cajennese{''} and ``ovale{''}, respectively, and are directly related to the transmission of the Brazilian spotted fever. This confirms the medical and veterinary significance of these species, as well as the need for further morphological studies that will bring a better understanding of their taxonomy, phylogeny, and control. In this context, the present study aimed to characterize the morphology of the male reproductive system of A. cajennese and A. aureolatum when unfed and after 4 days of feeding, thereby seeking to: (a) distinguish the two species or ``complexes{''}, and (b) study an internal system which has the potential to be targeted by acaricides. Therefore, males from both species (unfed and after 4 days of feeding) were cold-anesthetized, dissected, and had their reproductive systems removed for histological analysis. The results showed that the morphology of the male reproductive system is generally similar between both species, like in other Ixodidae ticks, exhibiting a multilobed accessory gland complex related to seminal fluid secretion, a pair of vasa deferentia and a pair of testes housing germ cells (spermatocytes) in different stages. The main differences were found in the development of the accessory gland complex cells and germ cells, showing that the maturation of the male reproductive system starts later in A. aureolatum, when compared to A. cajennese. However, during the blood meal, A. aureolatum development is increased, thus making germ cell maturation and gland complex activity higher than in A. cajennese. This study shows the differences in the development of the male reproductive systems of both species, while providing information that can assist in the establishment of new control methods. (AU)

FAPESP's process: 12/02384-8 - COMPARATIVE SPERMIOGENESIS AND EMBRYOGENESIS BETWEEN TICKS SPECIES OF THE GENUS Amblyomma (ACARI: IXODIDAE: PHYLOGENETIC AND NATURAL CHEMICAL CONTROL ASPECTS.
Grantee:Bruno Rodrigues Sampieri
Support Opportunities: Scholarships in Brazil - Doctorate