In which segments is the clitellum located?

The clitellum forms a band that can be flared, non-flared, saddle-shaped, or annular. It is generally found between segments 26 and 33. The clitellum is only found on adult worms.

1. How many segments are in the clitellum?
2. In which segment does the clitellum found in Pheretima Posthuma?
3. Is clitellum present in polychaeta?
4. Is clitellum present in Hirudinaria?
5. What is the function of the clitellum in earthworms?
6. What clitellum means?
7. Do leeches have clitellum?
8. What is the difference between Pheretima and Lumbricus?
9. What are the excretory organs of earthworm?
10. Does clitellum produce cocoon?
11. What is unique about Archiannelida?
12. Where is the clitellum located and what is it used for?
13. Where is the clitellum on an earthworm?
14. In which of the following clitellum is absent?
15. Do male earthworms have clitellum?
16. What is the purpose of excretory openings in earthworms?
17. What is the bump on a worm?

How many segments are in the clitellum?

Except for the mouth and the anal segments, each segment carries setae and nephridia. So, the correct answer is option (B) 14, 15, 16 segments.

In which segment does the clitellum found in Pheretima Posthuma?

➡️ clitellum is present on 14-16 segments on Pheretima . it is a prominent dark band of glandular tissues.

Is clitellum present in polychaeta?

The Clitellata are a class of annelid worms, characterized by having a clitellum - the 'collar' that forms a reproductive cocoon during part of their life cycles. The clitellates comprise around 8,000 species. Unlike the class of Polychaeta, they do not have parapodia and their heads are less developed.

Is clitellum present in Hirudinaria?

There is no permanent clitellum in Hirudinaria but temporary clitellum develops only during breeding season. This region possesses glandular wall. Nephridiopores are also present in this region, the male and female generative apertures are situated mid-ventrally on the X and XI segments respectively.

What is the function of the clitellum in earthworms?

… 32 and 37 is the clitellum, a slightly bulged, discoloured organ that produces a cocoon for enclosing the earthworm's eggs. The body is tapered at both ends, with the tail end the blunter of the two. Earthworms cannot see or hear, but they are sensitive to both light and vibrations.

What clitellum means?

Definition of clitellum

: a thickened glandular section of the body wall of some annelids that secretes a viscid sac in which the eggs are deposited.

Do leeches have clitellum?

As hermaphrodites, leeches have both male and female sex organs. Like the earthworms they also have a clitellum, a region of thickened skin which is only obvious during the reproductive period.

What is the difference between Pheretima and Lumbricus?

Note: Lumbricus is a genus of earthworms that are commonly seen in Europe. This genus comprises nearly 700 valid species. Earthworms are also oligochaetes which are soil-dwelling annelids. ... Pheretima communissima is a species of earthworm native to regions of China and East Asian countries.

What are the excretory organs of earthworm?

Nephridia are the primary excretory organs of earthworm that carry out the duties of excretion and osmoregulation. Based on where they remove the metabolic wastes, they are of two types – enteronephric nephridia and enteronephric nephridia.

Does clitellum produce cocoon?

A clitellum is a modification of the epidermis, which develops as an easily visible, glandular girdle partly behind the female pores; it secretes a cocoon in which eggs are laid.

What is unique about Archiannelida?

Archiannelida (phylum Annelida) A class of small, simple, annelid worms which are metamerically segmented (see METAMERIC SEGMENTATION) and most of which have narrow, tube-like bodies. In some, the nervous system is primitive. Parapodia and tentacles may be present. Separate male and female forms generally occur.

Where is the clitellum located and what is it used for?

The clitellum is a thick, saddle-like ring found in the epidermis (skin) of the worm, usually with a light-colored pigment. To form a cocoon for its eggs, the clitellum secretes a viscous fluid. This organ is used in sexual reproduction of some annelids, such as leeches.

Where is the clitellum on an earthworm?

Adult (sexually mature) earthworms have a distinct swelling called a clitellum. It is located about one-third of the way down the earthworm. The clitellum is often white or orange in colour. It produces most of the material secreted to form earthworm cocoons.

In which of the following clitellum is absent?

Related Biology Videos

Assertion : Setae are absent in clitellum <br> Reason : Setae help in locomotion.

Do male earthworms have clitellum?

The earthworms each have two male openings and two sperm receptacles, which take in the sperm from another mate. The earthworms have a pair of ovaries that produce eggs. The clitellum will form a slime tube around it, which will fill with an albuminous fluid.

What is the purpose of excretory openings in earthworms?

In earthworm, the nephridia functions for the removal of the excretory wastes both from blood and the coelomic fluid. There are 3 types of nephridia based on the structure and location: Septal nephridia or typical nephridia: Enteronephric nephridia. Integumentary nephridia: Exo-nephric nephridia.

What is the bump on a worm?

The bump is the clitellum, the saddle shaped swollen area 1/3 of the way back containing the gland cells which secrete a slimy material (mucus) to form the cocoon which will hold the worm embryos.