What are the 6 molluscs?
Class Gastropoda – snails, slugs, limpets, whelks, conchs, periwinkles, etc. Class Bivalvia – clams, oysters, mussels, scallops, cockles, shipworms, etc. The Class Scaphopoda contains about 400 species of molluscs called tooth or tusk shells, all of which are marine.
How are mollusks and worms alike?
It’s hard to imagine that a clam could be a close cousin to the earthworm, because most familiar molluscs have a highly modified body type. The ancestral mollusc probably resembled a chiton, a flattened worm like animal protected by a dorsal shell. Both molluscs and annelids probably evolved from free-living flatworms.
Is an earthworm an arthropod?
With just a little knowledge, it becomes easy to recognize them. Like woodlice, millipedes, spiders and scorpions, insects belong to a very large group of animals called arthropods. Other tiny animals are not arthropods. Earthworms have bodies composed of many segments, but have no legs.
What is the difference between flatworms and mollusks?
Flatworms are thin, flat, acoelomate animals that can be free-living or parasitic. Roundworms and rotifers have a more highly evolved gut than flatworms. Mollusks are coelomates with a muscular foot, a mantle, and a digestive tract with two openings.
Why must flatworms be flat?
Flatworms have a flat body because they lack a fluid-filled body cavity. The mesoderm layer allows flatworms to develop muscle tissues so they can move easily over solid surfaces. Flatworms have a concentration of nerve tissue in the head end. This was a major step in the evolution of a brain.
Do flatworms have a brain?
Flatworms’ bodies are bilaterally symmetrical and they have a defined head and tail region. They have a central nervous system containing a brain and a nerve cord. Clusters of light-sensitive cells on either side of their head make up what are called eyespots.
Why platyhelminthes are called flatworms?
Note: Platyhelminthes are a gathering of spineless creatures that are likewise called as flatworms on the grounds that their bodies are dorsoventrally flattened. So they seem like strips like animals. They are generally simple, bilateral, unsegmented and delicate bodied invertebrates.
What are 2 parasitic flatworms?
While there are several parasitic flatworms, tapeworms and flukes are the two most commonly studied types. These flatworms are capable of causing diseases in different host organisms, such as fish, dogs, domesticated animals, and humans.
How do humans get flatworms?
You can get a tapeworm, which is a type of flatworm, by drinking water contaminated with tapeworm eggs or larvae. Raw or undercooked meat is another way tapeworms can find their way into people. Tapeworms embed their heads into the intestinal wall and remain there.
How are flatworms treated in humans?
The most commonly used medicine for tapeworms is praziquantel (Biltricide). These medications paralyze the tapeworms, which let go of the intestine, dissolve, and pass from your body with bowel movements. If worms are large, you may have cramping when they pass.
How do I tell if I have worms?
Your doctor may ask you to bring in a sample so a lab can look for eggs, larvae, or tapeworm segments. A blood test can spot antigens, foreign substances that let your doctor know your body is trying to fight the infection. Sometimes, an MRI or CAT scan can find cysts formed by the pork tapeworm.