Biography about tapeworm

Image Source: Laboratory Diagnostic Assistance (DPDx), CDC.

Life history and Development of Taenia solium

1.

Copulation and fertilization

• The life cycle of Taeniasolium is digenetic, involving two hosts.
• But the life cycle of tapeworm is simple and without a free larval stage.
• Fertilization is preceded by copulation, inserting cirrus into the vagina of the same or another proglottid to release spermatozoa.
• Both self-fertilization and cross-fertilization occur in them.
• The cross-fertilization between different proglottids of the same tapeworm is very common.
• T. solium is protandrous, i.e., the testes mature first.

  Hence spermatozoa injected in the vagina are stored in the seminal receptacle till the ovary releases ova.

• When ova are released, then fertilization takes place, and zygotes are formed.

2. Capsule formation

• The zygotes or egg cells connect with yolk cells or vitelline cells in the ootype received from the vitel