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A review on the morphology of ovarian follicles in elasmobranchs: A case study in Rhizoprionodon taylori
Citation
Waltrick, DS and Simpfendorfer, CA and Awruch, CA, A review on the morphology of ovarian follicles in elasmobranchs: A case study in Rhizoprionodon taylori, Journal of Morphology, 278, (4) pp. 486-499. ISSN 0362-2525 (2017) [Refereed Article]
Copyright Statement
Copyright 2017 Wiley Periodicals, Inc.
Abstract
The 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.
Item Details
Item Type: | Refereed Article |
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Keywords: | sharks, reproduction, histology, elasmobranch reproduction, follicular development, atresia, luteinisation |
Research Division: | Biological Sciences |
Research Group: | Zoology |
Research Field: | Animal developmental and reproductive biology |
Objective Division: | Environmental Management |
Objective Group: | Marine systems and management |
Objective Field: | Marine biodiversity |
UTAS Author: | Awruch, CA (Dr Cynthia Awruch) |
ID Code: | 115891 |
Year Published: | 2017 |
Web of Science® Times Cited: | 4 |
Deposited By: | Zoology |
Deposited On: | 2017-04-18 |
Last Modified: | 2018-08-01 |
Downloads: | 0 |
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