Explain formation of ootheca in cockroach.
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Fertilization takes place within the vestibulum of the female genital pouch. The collaterial glands pour their secretions over the inner surface of the vestibulum to form the ootheca. Sixteen eggs are laid into a single ootheca.
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The Oriental cockroach creates a dark reddish-brown ootheca that is 8 to 10 mm in length. These oothecae appear slightly inflated and each contains approximately 16 eggs. The female deposits the egg case in a favorable environment after it is produced. Females produce between one and 18 egg cases in a lifetime.
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