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Follicle duct cell ultrastructure and eggshell formation in Triops cancriformis (crustacea, notostraca)
Author(s) -
Trentini Massimo,
Scanabissi Franca Sabelli
Publication year - 1982
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1051720110
Subject(s) - biology , eggshell , ultrastructure , vitellogenesis , oviduct , endoplasmic reticulum , duct (anatomy) , cytoplasm , follicle , population , eggshell membrane , anatomy , microbiology and biotechnology , zoology , oocyte , ecology , botany , endocrinology , embryo , demography , sociology
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.