Leech Diagram

The Leech Diagram helps us understand the structure of the Leech. They are segmented parasitic or predatory worms. Leeches are hermaphrodites and are part of the phylum Annelida and class Hirudinea. Leeches have a highly developed mechanism that prevents blood clotting. In this article, we will discuss the anatomy of leeches, their habitat, and the diagram of leeches in detail.

The diagram of the leech with the label is given below:

What is a Leech?

A leech is a segmented worm that is part of the phylum Annelida. They live in water and attach themselves to other creatures to drink their blood. Leeches are usually ectoparasitic and are part of the subclass Hirudinea. They have 32 brains, 125 teeth, and a highly developed mechanism to prevent blood clotting. Leeches are parasitic organisms that feed on the blood of fish, amphibians, and mammals. They can also be predators that catch and eat their prey. They have been used in therapy for centuries to treat a variety of diseases.

Also Read: Annelida - Definition, Classification, Characteristics, FAQs

Biological Classification of Leech

Leech scientific name is Hirudinaria granulosa. The biological classification of the leech is given below:

Habitat and Distribution

Leeches are found on all continents and seas, except terrestrial Antarctica. They can be found in freshwater, estuarine, and marine aquatic ecosystems, as well as moist terrestrial ecosystems. Leeches have different characteristics depending on their habitation. In all the places, they live on the other animals by the segmented parasitic system. They choose their host depending on the habitat. In different atmospheric areas, the leeches can be of different types.

Anatomy of the Leech

Structure of leech with labels is give at the top of the article. Leech show the following anatomy:

• Leeches possess a soft, elongated body that is dorso-ventrally flattened and measures roughly 30-35 cms in length.
• Their body is metamerically divided into 33 segments or somites, which are further divided into annuli or rings.
• Their body comprises six regions – cephalic region ( 1-5 segments), pre-clitellar (6-8), clitellar region (9-11), middle region (12-22), caudal (23-26) and the posterior sucker (27-33).
• Five pairs of eyes are located on the dorsal five segments.
• Segmental receptor organs include 3 pairs on the ventral side and 4 pairs on the dorsal side.
• They are also equipped with fully developed posterior and anterior suckers.
• The posterior sucker is circular and forms a muscular disc at the tail end. This sucker acts as an organ of adhesion and locomotion.
• The anterior sucker is ventral and oval-shaped. It forms a triradiate mouth via the fusion of prostomium and a few anterior segments.
• Nephridia are 17 pairs and are segmentally arranged from the 6th to 22nd segment.
• The alimentary canal is a straight tube located on the 25th segment.
• Anus is located on the 26th segment.
• Leeches are hermaphrodites. The male genital aperture is present mid-ventrally in the second and third annuli of the 10th segment. The female genital aperture is between the second and third annuli of the 11th segment.
• The male organs include testis sacs, vas efferens, vas deferens, epididymis, ejaculatory ducts and genital atrium. The female organs include the ovaries, oviducts and vagina. Sexual reproduction is common.

Also Read: Diagram of Fasciola hepatica: Classification and Structure

Conclusion - Leech Diagram

Leeches have a body structure which is formed with a multiple rings. The diagram of leech helps us study its structure in detail. Leeches attach themselves to a host with a sucker and feeds on blood. it first secretes the peptide hirudin to prevent the blood from clotting. Leeches have been used in medicine from ancient times until the 19th century to draw blood from patients. In modern times, it is used in the treatment of joint diseases such as epicondylitis and osteoarthritis, vein diseases and in microsurgery, while hirudin is used as an anticoagulant drug to treat blood-clotting disorder.

Also Read:

• Invertebrates - Examples, Types, and Characteristics
• Symmetry in Animals - Definition, Types and Importance
• What Is Parasitism?