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Oogenesls in the terrestrial hermit crab, coenobita clypeatus (decapoda, anomura): II. Vitellogenesis
Author(s) -
Komm Barry S.,
Hinsch Gertrude W.
Publication year - 1987
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.1051920309
Subject(s) - vitellogenesis , endoplasmic reticulum , golgi apparatus , biology , yolk , cytoplasm , ultrastructure , microbiology and biotechnology , anomura , vesicle , decapoda , oocyte , anatomy , zoology , crustacean , biochemistry , ecology , embryo , membrane
Oocytes from the land hermit crab, Coenobita clypeatus , in various stages of vitellogenesis were examined by light and electron microscopy. Early vitellogenic oocytes are characterized by accumulations of discrete vesicles of endoplasmic reticulum in the perinuclear cytoplasm. As oocytes develop, the endoplasmic reticulum becomes abundant, and numerous Golgi complexes are seen. There is a well developed Golgi‐endoplasmic reticulum interaction. Within the confines of the reticulum are discrete intracisternal granules, which can be seen coalescing into electron‐dense yolk bodies. Lipid accumulation is seen throughout the cytoplasm. Coincident with the burst of intra‐oocytic metabolism are oolemma modifications and micropinocytosis, which provide ultrastructural evidence for extra‐oocytic yolk production. The mature oocyte contains numerous yolk and lipid vesicles of varying electron density that comprise both intra‐ and extra‐oocytic substrates.