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The structure of the embryonic external gill filaments of the Velvet belly shark Etmopterus spinax
Article first published online: 20 AUG 2009
DOI: 10.1111/j.1469-7998.1976.tb04677.x
1469-7998/asset/cover.gif?v=1&s=ec34f05777fda21f88c13e60007b0ee7d497ce89 "Journal of Zoology")
Additional Information
How to Cite
Kryvi, H. (1976), The structure of the embryonic external gill filaments of the Velvet belly shark Etmopterus spinax. Journal of Zoology, 180: 253–261. doi: 10.1111/j.1469-7998.1976.tb04677.x
Publication History
- Issue published online: 20 AUG 2009
- Article first published online: 20 AUG 2009
- Accepted 13 April 1976
- Abstract
- References
- Cited By
The purely embryonic external gill filaments of sharks consist of a single capillary loop, covered by a two-layered epithelium with short microvilli. Towards the end of the embryonic period, the epithelial cells are filled with fibrils, about 10 nm in diameter, and mitochondria, endoplasmic reticulum and Golgi bodies disappear. The basal lamina increases in thickness, and collagen fibrils accumulate beneath. Numerous dense vesicles appear in the endothelial cells.