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HomeHomework HelpbiologyPlatyhelminthes (flatworms)

Platyhelminthes (flatworms)

Platyhelminthes, commonly known as flatworms, are a phylum of invertebrate animals characterized by their flattened body shape, bilateral symmetry, and lack of a coelom. They exhibit a simple body plan with a central nervous system and are often hermaphroditic, possessing both male and female reproductive organs.

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Biology
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Overview

Platyhelminthes, or flatworms, are a diverse group of invertebrates known for their flattened bodies and lack of a coelom. They can be found in various environments, including freshwater, marine, and terrestrial habitats. Flatworms are classified into three main classes: Turbellaria (free-living), C...

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Key Terms

Coelom
A fluid-filled body cavity that is completely surrounded by mesoderm.

Example: Flatworms lack a coelom, making them acoelomate.

Acoelomate
An organism that does not have a coelom.

Example: Platyhelminthes are classified as acoelomates.

Turbellaria
A class of free-living flatworms.

Example: Planarians are part of the Turbellaria class.

Cestoda
A class of parasitic flatworms known as tapeworms.

Example: Cestoda can infect the intestines of various animals.

Trematoda
A class of parasitic flatworms known as flukes.

Example: Liver flukes belong to the Trematoda class.

Regeneration
The ability to regrow lost body parts.

Example: Some flatworms can regenerate their tails.

Related Topics

Annelida
Segmented worms that share some characteristics with flatworms but have a coelom.
intermediate
Nematoda
Roundworms that are also important in ecosystems and can be parasitic.
intermediate
Ecology
The study of interactions between organisms and their environment, relevant to understanding flatworm habitats.
advanced

Key Concepts

Body structureReproductionHabitatEcological role