What is the characteristics of tapeworm?

Tapeworms are bilaterally symmetrical (i.e., the right and left sides are similar). Some consist of one long segment; others have a definite head, followed by a series of identical segments called proglottids. The head, or scolex, bears suckers and often hooks, which are used for attachment to the host.

How do you identify cestodes?

Diagnosis of infection with adult cestodes is based on identification of eggs and segments (proglottides) in feces. Larval infections are more difficult to assess; serology and biopsy are helpful. Control depends on sanitation, personal hygiene, and thorough cooking of meat and fish.

What are cestodes commonly known as?

Cestodes, or tapeworms, include multiple species of flat worms that can reside in the human gastrointestinal tract. The species that most commonly cause human disease include Taenia saginatum, Taenia solium, Diphyllobothrium latum and Hymenolepis nana.

What are cestodes give examples?

Tapeworms/Lower classifications

Where are cestodes found?

intestine
Cestodes reside in the intestine of the definitive vertebrate host and the larvae stage(s) are found in the bodies of the intermediate host(s), which can be both invertebrates and/or vertebrates. Cestodes mainly cause gastrointestinal problems, but can migrate into the brain and liver (Siles-Lucas and Hemphill, 2002).

What is the life cycle of cestodes?

All cestodes cycle through 3 stages—eggs, larvae, and adults. Adults inhabit the intestines of definitive, or final, hosts, which are mammalian carnivores, including humans. Several of the adult tapeworms that infect humans are named after their main intermediate host (the fish, beef, and pork tapeworms).

How many types of cestodes are known?

Diversity and habitat. All 6,000 species of Cestoda are parasites, mainly intestinal; their definitive hosts are vertebrates, both terrestrial and marine, while their intermediate hosts include insects, crustaceans, molluscs, and annelids as well as other vertebrates.

Why are cestodes successful parasites?

Cestodes are considered successful parasites because they can live in their hosts for years without being detected. During that time, the cestodes grow in length by adding new segments to their bodies.

What is the difference between cestodes and trematodes?

Cestodes are tape-like and segmented in shape, have a head with suckers and possibly hooks, and lack a digestive tract. Trematodes are leaf-like and unsegmented, lack hooks entirely, and have an incomplete digestive tract. Generally, cestodes require two hosts and trematodes need three to complete their life cycles.

What is the difference between cestodes and trematodes?

Cestodes are tape-like and segmented in shape, have a head with suckers and possibly hooks, and lack a digestive tract. Trematodes are leaf-like and unsegmented, lack hooks entirely, and have an incomplete digestive tract. Generally, cestodes require two hosts and trematodes need three to complete their life cycles.

What are the main difference between cestodes trematodes and nematodes?

The main difference between cestodes and nematodes is that cestodes are tapeworms that belong to the phylum Platyhelminthes, whereas nematodes are roundworms that belong to the phylum Nematoda.

What are the two orders of cestodes?

Cestodes (tapeworms) include flatworms belonging to the phylum Platyhelminthes, class Cestoidea, subclasses Cestodaria (two orders) and Eucestoda (sixteen orders), and about fifty-nine families.

What is the classification and description of tapeworms?

Tapeworms are long, segmented worms of the class Cestoda, which comprise 1 of 3 classes of parasitic worms (worms that require a host within which to mature). The other classes are Nematoda and Trematoda. These worms lack an intestinal tract and instead can absorb nutrients through their integument.

Are cestodes multicellular?

Kingdom: Animalia – As members of kingdom Animalia, Cestodes are multicellular organisms. They are also heterotrophs that are capable of sexual reproduction. Phylum: Platyhelminthes – The phylum Platyhelminthes consists of acoelomate flatworms that may or may not be segmented.

What are the characteristics of trematodes?

Trematodes are flatworms classified in the phylum Platyhelminthes, class Trematoda, subclass Digenea. In general, trematodes are dorso-ventrally flattened and leaflike in shape. Their bodies are covered with tegument, which is usually armed with scalelike spines. They have two suckers: one oral and one ventral.

Are cestodes hermaphroditic?

Cestodes are exclusively hermaphrodites, with both male and female reproductive systems in each body. The reproductive system includes one or more testes, cirri, vas deferens, and seminal vesicles as male organs, and a single lobed or unlobed ovary with the connecting oviduct and uterus as female organs.

How do cestodes reproduce?

Cestodes are capable of asexual reproduction via self-fertilization but may also sexually reproduce with a mate as a form of tapeworm reproduction. Asexual reproduction is more common than sexual reproduction in cestodes, and it takes place within a mature proglottid.

Do cestodes have a digestive system?

Tapeworms do not have a digestive tract. Instead, they absorb their nutrients from the gut contents of the host directly through their outside surface, tegument. New proglottids are constantly formed in the neck of the worm and along the length of the tapeworm they mature.

Are cestodes dioecious?

The dioecious cestodes are worms in which the male reproductive system is in one strobila and the female system is in another strobila.

What are the 6 types of tapeworms?

Types
  • pork tapeworm (Taenia solium)
  • beef tapeworm (Taenia saginata)
  • dwarf tapeworm (Hymenolepis nana)
  • fish tapeworm from raw freshwater fish (Diphyllobothrium latum)
  • dog tapeworm, which is more common in rural areas.

Do tapeworms have a heart?

Worms possess a heart-like structure called an aortic arch. Five of these arches pump blood around the worm’s body.

Are tapeworms asexual?

Tapeworms can reproduce either sexually or asexually, depending upon the specific species and circumstances. A tapeworm’s body is made up of different segments called “proglottids,” which contain both female and male reproductive cells.

What is the scientific name for tapeworm?