2. Slime glands: These are present in body wall.
Their secretion keeps the body moist and slippery so that the host can’t remove it easily while it sucks blood. 3. Suckers: These are the organs that help in locomotion as well as in making firm adhesion to the host’s body while feeding. 4. Jaws and pharynx: Triradiate jaws are equipped with denticles, able to make incision in the skin of the host. A muscular suctorial pharynx works as a suction pump to suck more and more blood, oozing out from the wound. 5.
Hirudin: Hirudin is an anticoagulant, secreted by salivary gland when it sucks the blood to prevent it from coagulation. It faciliates the feeding. 6. Spacious crop: The availability of the host to the leeches is not regular. Therefore its digestive tract is modified in order to store a great quantity of blood in a single meal whenever it gets chance to feed.
To accomodate the large amount of blood the crop is spacious, thin walled, elastic and capable of great dilation. 7. Slow digestion: Blood from crop is poured into stomach drop by drop because digestion is very slow.
So that after a full meal a leech can stay for one year or more without feeding. For this reason also, leeches lack elaborate digestive juices and enzymes for digestion. 8. Sense organs: These are well developed and provide the animal with greater opportunities of life. 9. Hermaphroditism: This doubles the rate of reproduction as after copulation both individuals lay eggs. 10. Development: It takes place in cocoon with full safety and efficiency.
It is very quick and takes only a fortnight.