What are three types of platyhelminthes?

What are three types of platyhelminthes?

The Platyhelminthes includes three classes: the Turbellaria (free-living flatworms), the Trematoda (flukes), and the Cestoda (tapeworms).

What are the 4 classes of platyhelminthes?

Platyhelminthes are traditionally divided into four classes: Turbellaria, Monogenea, Trematoda, and Cestoda (Figure 2).

What does Mollusca mean?

Medical Definition of Mollusca : a large phylum of invertebrate animals (as snails, clams, and mussels) that have a soft unsegmented body lacking segmented appendages and commonly protected by a calcareous shell.

Is a scallop a mollusc?

Bivalve mollusks (e.g., clams, oysters, mussels, scallops) have an external covering that is a two-part hinged shell that contains a soft-bodied invertebrate. Like fish, bivalve mollusks breathe through their gills. As filter feeders, bivalves gather food through their gills.

How can you tell a real scallop from a scallop?

Genuine scallops have distinct grains or fibers running lengthwise, as the edible part of scallop meat serves as a muscle that holds the two scallop shells together. A fake scallop will have fewer fibers and appear more solid and dense. *And finally, look for at the thickness and see if it’s the same on all sides.

Why do scallops have eyes?

Scallops are highly sensitive to shadows, vibrations, water movement, and chemical stimuli. All possess a series of 100 blue eyes, embedded on the edge of the mantle of their upper and lower valves that can distinguish between light and darkness. They serve as a vital defense mechanism for avoiding predators.

Why do scallops have 200 eyes?

The scallop has 200 tiny eyes lining its mantle, or outside edge. Our eyes use lenses (the cornea) that focus and bend the light passing through it. The light is focused into the retina, or the light-sensitive tissue layer at the back of the eye. But scallop eyes, and powerful telescopes, use mirrors instead.

Does a scallop have 200 eyes?

The word “scallop” usually evokes a juicy, round adductor muscle—a seafood delicacy. So it isn’t widely known that scallops have up to 200 tiny eyes along the edge of the mantle lining their shells. The complexities of these mollusk eyes are still being unveiled.