Tapeworm Quiz: Dipylidium caninum Facts and Common Name

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Questions and Answers

What is the common name for Dipylidium caninum?

Double-pored tapeworm

Where are the reproductive organs located in the mature segments of Dipylidium caninum?

Midways on each lateral margin

What is the shape of the eggs of Dipylidium caninum found in fecal samples?

Spherical

What is the role of the intermediate hosts in the life cycle of Dipylidium caninum?

Dog and cat fleas, and biting lice Signup and view all the answers

Which of the following is the most common tapeworm of dogs in most parts of the world?

Dipylidium caninum Signup and view all the answers

What is the shape of the segments of the Dipylidium caninum tapeworm?

Oval resembling cucumber seeds Signup and view all the answers

What is the characteristic feature of the scolex of Dipylidium caninum?

Four unarmed suckers and an armed rostellum Signup and view all the answers

Which part of the Dipylidium caninum tapeworm exhibits the presence of four unarmed suckers and an armed rostellum?

Scolex Signup and view all the answers

What is the characteristic appearance of the ovary and vitelline glands in the mature segments of Dipylidium caninum?

Forming a mass on either side resembling a bunch of grapes Signup and view all the answers

Describe the scolex of Dipylidium caninum and its characteristic features.

The scolex of Dipylidium caninum exhibits the presence of four unarmed suckers and an armed rostellum. Signup and view all the answers

What is the intermediate host for Dipylidium caninum?

Dog and cat fleas, Ctenocephalides canis and C. felis Signup and view all the answers

Explain the differentiation between immature, mature, and gravid segments of Dipylidium caninum.

Immature segments of Dipylidium caninum contain two sets of reproductive organs, while mature segments have degenerated reproductive organs and are filled with eggs in packets or capsules. Gravid segments are filled with eggs in packets or capsules. Signup and view all the answers

What are the intermediate hosts of Dipylidium caninum and how do they contribute to its life cycle?

The intermediate hosts of Dipylidium caninum are the dog and cat fleas, Ctenocephalides canis and C. felis, and the biting lice Trichodectes canis, Heterodoxus spiniger, and H. longitarsus. They contribute to the life cycle by serving as hosts for the development of the parasite. Signup and view all the answers

Describe the appearance of the ovary and vitelline glands in the mature segments of Dipylidium caninum.

The ovary and vitelline glands in the mature segments of Dipylidium caninum form a mass on either side resembling a bunch of grapes, with numerous testes distributed throughout the parenchyma. Signup and view all the answers

What is the characteristic appearance of the eggs of Dipylidium caninum found in fecal samples?

The eggs of Dipylidium caninum found in fecal samples have a spherical shape and contain a fully developed embryo (oncosphere or hexacanth embryo) with the presence of six hooklets. Signup and view all the answers

Study Notes

Dipylidium caninum

Commonly known as the double-pored tapeworm
Reproductive organs are located in the mature segments

Anatomy

Scolex has four unarmed suckers and an armed rostellum
Characteristic feature of the scolex is the presence of hooks
Segments are rectangular in shape
Ovary and vitelline glands in the mature segments are "H"-shaped

Life Cycle

Intermediate hosts are fleas and lice
Intermediate hosts contribute to the life cycle by ingesting eggs, allowing the parasite to develop
The parasite completes its life cycle when the definitive host (dog) ingests an infected intermediate host

Segments

Immature segments: undeveloped reproductive organs
Mature segments: developed reproductive organs, contain eggs
Gravid segments: contain fully developed eggs, ready to be released

Eggs

Found in fecal samples, oval in shape
Characteristic appearance: 30-40 μm in length, with a distinctive double-pored operculum

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Dipylidium caninum Tapeworm Quiz