Follicle duct cell ultrastructure and eggshell formation in Triops cancriformis (crustacea, notostraca)
✍ Scribed by Massimo Trentini; Franca Sabelli Scanabissi
- Book ID
- 102904051
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 977 KB
- Volume
- 172
- Category
- Article
- ISSN
- 0362-2525
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Electron microscopy of the cells of the follicle duct of Triops cancriformis shows that the follicular ducts are lined by a single‐layered epithelium which also produces the eggshell material. The cytoplasm is rich in rough endoplasmic reticulum that synthesizes the eggshell material which subsequently aggregates into preformed vacuoles. Newly formed spheres of eggshell material are then excreted into the lumen. At the end of vitellogenesis the oocytes descend toward the longitudinal oviduct and pass through the eggshell material which fills the follicle ducts. The production of the eggshell and its chemical composition in some Phyllopoda are compared. The paper discusses the relationship between the eggshell construction and the reproductive biology of the population.