Tubellaria Reproductive System

   

Tubellaria Reproductive System

Reproduction happens sexually and asexually. Reproduction depends on the length of day and temperature. Sexual reproduction occurs in short days and cold air. Asexual reproduction occurs in long days and warm air. Sexual reproduction occurs through cross-breeding. In cross-breeding, two Planaria attach themselves to the ventral part so that the genitals (porus genitalis) face and intersect, then internal fertilization occurs. This can happen if the sex cells are ripe. Planaria is hermaphrodite. However, sperm cannot fertilize an egg from its own body, because the ripening period of sperm and eggs is different. Asexual reproduction with regeneration, which begins with a body that increases in length and the body part near the pharynx gradually narrows and eventually breaks. The cut off part will complete itself. Each will be a new and complete body. The ability to complete lost or damaged parts of the body is called regeneration. Planaria is known to have high regeneration power

Fig. Planaria Reproductive Organ Structures