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A review on the morphology of ovarian follicles in elasmobranchs: A case study in Rhizoprionodon taylori
journal contribution
posted on 2023-05-19, 03:52 authored by Waltrick, DS, Simpfendorfer, CA, Cynthia AwruchCynthia AwruchThe identification of the elasmobranch secondary ovarian follicles and their function can be challenging and the inconsistent use of terminology derived from other taxa is a matter of ongoing debate. In this study, the available information on the histology of the elasmobranch secondary ovarian follicles derived from atresia (preovulatory follicles) or ovulation (postovulatory follicles) is reviewed highlighting their morphology and steroidogenic capacity. Based on this literature review, the ovarian follicles of the Australian sharpnose shark Rhizoprionodon taylori were classified according to their preovulatory or postovulatory origin. Two types of secondary follicles originating from atresia of developing follicles (atretic previtellogenic follicles) and ripe follicles (atretic vitellogenic follicles), and one type of postovulatory follicle were identified throughout the reproductive year of this species. Morphological similarities of the elasmobranch secondary ovarian follicles and their variations in different species denote the difficulty to classify them. Given the multiple origins of ovarian follicles, their poorly understood functions and capacity to supply steroids, visual identification of these structures and the use of terminology derived from mammalian and other vertebrate studies (with the exception of the corpora lutea as a temporary endocrine gland) is not advisable.
Funding
Winifred Violet Scott Charitable Trust
History
Publication title
Journal of MorphologyVolume
278Issue
4Pagination
486-499ISSN
0362-2525Department/School
College Office - College of Sciences and EngineeringPublisher
Wiley-LissPlace of publication
Div John Wiley & Sons Inc, 605 Third Ave, New York, USA, Ny, 10158-0012Rights statement
Copyright 2017 Wiley Periodicals, Inc.Repository Status
- Restricted