Platyhelminthes

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Platyhelminthes

Platyhelminthes (pronounced: plat-ee-hel-min-thiz), also known as flatworms, are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.

Etymology

The term "Platyhelminthes" comes from the Greek words "platys" meaning flat and "helmins" meaning worm.

Definition

Platyhelminthes are a phylum of worms characterized by their flat, soft bodies. They are bilaterally symmetrical, meaning their left and right sides are mirror images of each other. They lack a body cavity, or coelom, and their bodies are solid between the outer surface and the cavity of the digestive system.

Classification

Platyhelminthes are divided into four classes: Turbellaria, which are mostly non-parasitic animals such as planarians; Monogenea and Trematoda, which are parasitic flukes; and Cestoda, the tapeworms.

Anatomy

The body of a platyhelminth is covered by a layer of cells called the epidermis. Underneath the epidermis is a layer of muscle tissue, which allows the worm to move. The interior of the worm is filled with a type of connective tissue called parenchyma.

Reproduction

Most platyhelminths are hermaphrodites, meaning each individual has both male and female reproductive organs. They can reproduce both sexually and asexually.

Related Terms

External links

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