🪱 Flatworms, Roundworms, and Mollusks (Invertebrates)

Flatworms include what types of organisms?

Planarians, flukes, and tapeworms

Describe planarians.

Free-living flatworms with eyespots and simple brains

Describe flukes.

Parasitic flatworms with suckers to attach to hosts

Describe tapeworms.

Parasitic flatworms that live in intestines and absorb nutrients through their body surface

What bilateral animals do NOT have a body cavity or coelom?

Flatworms

What are the characteristics of nematodes?

Bilateral symmetry, pseudocoelom, complete digestive tract, cuticle covering, molts, some parasitic

What type of coelom do nematodes have?

Pseudocoelom

What is the function of the cuticle in nematodes?

Provides protection and must be molted to grow

What are the characteristics of molluscs?

Soft-bodied, often with shells, body plan includes foot, visceral mass, and mantle

Examples of molluscs.

Snails, clams, squids, octopuses

What are the three main parts of a mollusk’s body plan?

Muscular foot, visceral mass, and mantle