Histoarchitecture of the Ovary of Rhipicephalus (Boophilus) annulatus during Pre‐ and Postengorgement Period

Abstract

The present communication describes the detailed day wise study of histological changes of the ovary of Rhipicephalus (Boophilus) annulatus in the postengorgement period together with the systematic classification of their oocytes. The ovary of R. (B.) annulatus is panoistic type with an asynchronous development of oocytes. All the stages (II, III, IV, and V) of oocytes except stage I were similar to R. (B.) microplus. The stage I oocytes showed basophilia, which was not reported earlier in other species of ticks. Day wise changes were in the form of presence of oogonia in partially fed and day one engorged adults, considerable degeneration of oocytes on day two, emergence of new wave of oocytes on day three, presence of mature oocytes up to day eight, and complete degeneration of ovarian tissue from day eight onwards. The degenerative changes in the ovary appeared initially in the oocytes followed by germinal epithelium.

Modulation of the PGE2-Mediated Pathway in the Eclosion Blocking Effect of Flumethrin and Terpenoid Subfraction Isolated from Artemesia nilagirica in Rhipicephalus annulatus

“…The germ vesicle was invisible in them. The histological findings in the ovary of R. annulatus were similar to our previous report [ 73 ].…”

“…The findings indicated that biosynthesis of prostaglandin occurred normally in the control group and the prostaglandins had an important role in the maturation of ovaries and oviposition. Moreover, the histological features of the ovary of the ticks treated with methanol (control) were comparable to that of a normal ovary [ 73 ]. Since the localization of the inducible COX2 was not studied, it was difficult to specify the type of PGES localized in the ovarian section.…”

Histopathological effects of the fruit extract of Citrullus colocynthis on the ovary of the tick Hyalomma dromedarii

“…Oocytes in the present study might be classified into oogonia and stages I, II, III, IV and V based on Roshdy ( 1969 ) and Balashov ( 1983 ) classifications. Similarly, oocytes were classified into five stages in Haemaphysalis longicornis (Yano et al 1989 ; Mihara et al 2018 ), Amblyomma cajennense (Denardi et al 2004 ), Rhipicephalus microplus (Saito et al 2005 ), R. sanguineus (Oliveira et al 2005 ; Sanches et al 2012a ), A. triste (Oliveira et al 2006 ), A. brasiliense (Sanches et al 2010 ), A. rotundatum (Sanches et al 2012b ), A. varium (Sanches et al 2014 )d annulatus (Kanapadinchareveetil et al 2015 , 2019 ).…”