What type of organism is categorized under Platyhelminthes?

Platyhelminthes is a phylum that comprises flatworms, which are characterized by their flattened body shape, soft bodies, and bilateral symmetry. These organisms typically have a simple body structure without a coelom (body cavity) and possess a central nervous system with a distinct head region. Flatworms include several classes, such as planarians, flukes, and tapeworms, each with unique life histories and adaptations.

Understanding the unique features of Platyhelminthes is crucial for distinguishing them from other groups. Earthworms belong to the phylum Annelida and have a segmented body structure, while clams are mollusks from the phylum Mollusca characterized by a hard shell and unsegmented body. Sea stars are echinoderms under the phylum Echinodermata, recognized for their radial symmetry and hard, spiny skin. In contrast, the defining characteristics of flatworms align closely with the traits described in Platyhelminthes.