Answer: Platyhelminthes are a group of invertebrates that are also called as flatworms because their bodies are dorsoventrally flattened. So they appear like ribbon-like creatures.

Which animal has a flattened ribbon like body?

ribbon worm, also called bootlace worm, proboscis worm, nemertine, or nemertean, any member of the invertebrate phylum Nemertea (sometimes called Nemertinea, or Rhynchocoela), which includes mainly free-living forms but also a few parasites of crustaceans, mollusks, and sea squirts.

Which are ribbon like animals?

Nemertea is a phylum of invertebrate animals also known as ribbon worms or proboscis worms. Alternative names for the phylum have included Nemertini, Nemertinea and Rhynchocoela. Most are very slim, usually only a few millimeters wide, although a few have relatively short but wide bodies.

In which of the following the body is thin and flattened or leaf-like or ribbon like?

The phylum name Platyhelminthes literally means "flatworms." Members of this phylum are soft, thin-bodied, leaf or ribbonlike worms, including the familiar planaria of ponds and streams, as well as the flukes and tapeworms parasitic in human and other animal bodies.

Why are platyhelminthes flat?

Flatworms are unsegmented worms with a tail and a head end. They are bilaterally symmetrical with a definite upper and lower surface. They have no body cavity or and no specialized respiratory or circulatory organs. This is the reason behind the flat shape, common to all flatworms.

The Guinea Worm Slayer - 2013 | The New York Times

30 related questions found

What do platyhelminthes eat?

They feed on tunicates, small crustaceans, worms, and molluscs. These flatworms feed like sea stars, extruding their pharynx, which secretes enzymes to digest their prey.

Which of the following is a free living flat worm?

(a) Planaria (Dugesia) belong to class Turbellaria of phylum platyhelminthes. Mostly free living flatworms are placed in class Turbellaria.

Are ribbon worms benthic?

The Nemertea are colloquially known as ribbon worms. Most species of phylum Nemertea are marine, predominantly benthic or bottom dwellers, with an estimated 900 species known.

What is a ribbon worm animal?

Ribbon worms, or nemerteans, are a group of very unusual worms related to mollusks and annelids. Most ribbon worms live in the ocean, and some can grow to over 100 feet long, but are usually much less than an inch wide. Some species live on land or in freshwater. Unlike annelids, ribbon worms are not segmented.

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.

How does a flatworm eat?

They have simple digestive systems, with mouths to take in food and long digestive tracts to diffuse it around the body. Most flatworms take in food via their mouth, then move it into a digestive gut that attaches to the digestive structures. The food then breaks down and is absorbed out into the rest of the organism.

Is Ascaris a flatworm?

While there are plenty of free-living flatworms and roundworms, there are parasitic forms of both flatworms and roundworms that cause disease in humans. ... Roundworms that cause disease include Ascaris, a large intestinal worm that can grow to the size of a pencil, as well as hookworms and whipworms.

What invertebrate group has flat bodies?

Flatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates.

Does pore bearing body?

Complete answer:

Porifera is the phylum that includes the animals with spores on the body. ... Members of this phylum are sponges. Sponges are animals that bear pores on the body.

Which group of animals is called flatworms?

Animals belonging to the phylum Platyhelminthes are also called flatworms due to dorsoventrally flattened bodies.

How do ribbon worms recover if they are hurt or bitten?

Many ribbon worms can regenerate when a predator takes a bite, healing their broken ends. One worm species, Ramphogordius sanguineus, has an exceptional ability to regenerate: if any part of their body is severed (except for the very tip of their tail where there are no nerves), it can regrow into a new worm.

Do ribbon worms have eyes?

The body of a ribbon worm is rather flattened. Although it appears smooth, the body is covered with microscopic hairs (cilia). Ribbon worms may have zero to 80 'eyes' (light-dectecting sensors). Some ribbon worms produces mucus through which they move.

Are ribbon worms Deuterostomes?

They found that ribbon worms and horseshoe worms are evolutionarily closely related, despite looking very different. Surprisingly, the researchers found that these worms, which are protostomes, share many gene families and gene arrangements with the deuterostomes, the group that includes the vertebrates.

Is an example of Freeliving flat worm?

Turbellarians (Planarians; Free-Living Flatworms)

Which is the free-living freshwater flat?

Planaria is a free-living freshwater flatworm. Planaria belongs to the class Turbellaria, which mostly contains free-living species.

Is Pheretima a free-living worm?

D)Aschelminthes. Hint: Pheretima is a genus of earthworms which is mostly found in soil. Hirudinaria is known as cattle leech. It is free- living or living as parasites.

Are flat worms herbivores?

Although very thin and delicate, flatworms are active carnivores and scavengers, using their proboscis to feed on dead or injured animals and colonial animals such as bryozoans and soft-corals.

Does Platyhelminthes have segmentation?

Taxonomic level: phylum Platyhelminthes; grade of construction: organs derived from three tissue layers; symmetry: bilateral; type of gut: blind; type of body cavity other than gut: none; segmentation: absent; circulatory system: none; nervous system: small bundles of nerves (ganglia), two ventral nerve cords; ...

Are Platyhelminthes hermaphrodites?

Platyhelminthes are hermaphrodites in which internal fertilization is firmly established, both in the free-living animals and in the parasitic forms.