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Figures 1–4.

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Stages 1 and 2 of vitellogenesis in C. metoecus. (1) An immature vitellocyte (Stage 1) at the periphery of the follicle. The nucleus is filled with heterochromatin and the cell possesses a high nucleo-cytoplasmic ratio. Scale bar = 1 μm. (2) Immature vitellocyte at first stage of maturation filled with ribosomes, mitochondria, and few endoplasmic reticulum saccules. Scale bar = 1 μm. (3) Electron micrograph of second stage of vitelline cells’ maturation (arrowheads: basal lamina). Scale bar = 1 μm. (4) Part of the cytoplasm of a cell at second stage of maturation showing Golgi complexes and granular endoplasmic reticulum. Scale bar = 1 μm. GC: golgi complex; GER: granular endoplasmic reticulum; Hch: heterochromatin; M: mitochondrion; N: nucleus; Nl: nucleolus; SG: shell globule.

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