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Ch.10 zoology flatworms
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Flatworms belong to the phylum Platyhelminthes. They have the simplest body plan of all bilaterally symmetrical animals. They are called flatworms because their bodies are compressed. The mouth is the only opening into the digestive cavity the flatworms have. Food is taken in through this hole and wastes are discharged also through this hole. Flatworms have a well-defined nervous, muscular, excretory, and reproductive system. The flatworm distributes the food it digests through a digestive tube that branches throughout all of its body parts. The fact that the worm’s body is flat serves many purposes. It allows the worm to hid in small spaces, to fit into the opening of other animals if the worm is parasitic, and it means that all the cells are close enough to the surface for exchange of oxygen and carbon dioxide with the environment (Meinkoth 399).
There are about thirty thousand species of worms in the phylum Platyhelminthes. Twenty five thousand of these worms are parasitic, which is the vast majority of the phylum. The flatworms only account for four thousand of the worms in the phylum, but they are said to be very beautiful compared to the parasitic worms (Snyderman and Wiseman 83). Flatworms display bilateral symmetry, which means that their bodies have a distinctive head and rear, and their right and left sides are mirror images of each other. The fact that these worms are bilaterally symmetric enables them to move from place to place more efficiently. This trait can help the worms catch their food and get away from their enemies. It can help them find a mate and move from location to location. If they were not made like this, they would have very little control over their bodily movements, and not be able to survive in the ocean (Snyderman and Wiseman 84).
Some other characteristics that make worms of the phylum Platyhelminthes unique are the fact that they are light sensitive. They often try to avoid brightly lit areas. They are so sensitive because they possess’ bundles of light-sensitive eyes that are often described as primitive eyes (Snyderman and Wiseman 84). Another interesting characteristic of the flatworms is that they are hermaphroditic. This means that they posses both male and female reproductive organs. When one learns of this they may think that self-fertilization would be common, but it is not. Flatworms also posses amazing regenerative properties. When they lose a body part, a new one will form, and it some cases, the body part often regenerates an entirely new flatworm (Snyderman and Wiseman 84).
Fox, R. 2001. Invertebrate Anatomy OnLine: Artemia Franciscana. Lander University. http://webs.lander.edu/rsfox/invertebrates/artemia.html, retrieved February 13, 2011.
The Meningeal Worm Infestation of up to 20 meningeal worms has been discovered in a single deer’s subdural cavity. The white tail deer are the preferred host, but they rarely ever suffer from any sick or neurological problems from this type of worm. We will see severe signs in llamas and alpacas; these are the two animals that can become infected with it frequently. The meningeal worm can cause damage to the central nervous system and could result in death, so it is important to try and catch it early and learn about how to prevent this deadly worm. Things that you should be familiar with about the meningeal worm are its life cycle, the signs in your animal, and any prevention or treatment options.
The Sacculina carsini, or parasitic barnacle, makes it’s host a green crab, also known as the Carcinus maenas. The parasite in this relationship changes the host’s behavior. It also enables itself to survive, spread and continue this cycle. As talked about in “The Parasitic Sacculina That Bends Its Host to Its Own Will”, when a female barnacle is still in its larval stage, it finds a crab host, and it locates a certain joint in the host’s shell. When there, the parasitic barnacle sheds her outer shell and puts herself inside the crab. Once she is inside, she is in a slug-like form. She creates a root system of tendrils, which extend throughout the abdomen of the crab. The root system takes over the crab’s intestine, diverticulae and surrounds the stomach. This
Phylon 49.3/4 (2001): 173. Academic Search Premier -. Web. The Web. The Web. 20 Mar. 2014.
Warren, Richard. The Purpose-driven Life: What on Earth Am I Here For? Grand Rapids, MI: Zondervan, 2002. Print.
The everyday death of man is a show for the angels. Our hero worm represents death and people are the actors. The worm of death is from the Phylum Nematoda. Many roundworms cause diseases in humans, which can lead to death. I have, however, reason to believe this is actually the blood fluke, Schistosoma of the Class Trematoda in Phylum Platyhelminthes.
The first specimens of platypuses brought back to England were thought to be hoaxes similar to mermaids (Moyal, 2001). Found only in and around Australia, there are only three living species of monotremes: the platypus (Ornithorhynchus anatinus) and two species of echidnas (Tachyglossus aculeatus, and Zaglossus bruijni). The word “monotreme” is Greek for “one-hole,” referring to the cloaca that is the exit for the urinary, reproductive, and excretory systems (Dawson, 1983). The creatures are oviparous—the females lay eggs that develop outside of her body. This paper will explain the background of the animals, the anatomy of the tract and egg, breeding behavior, and genetics behind this unique reproductive system.
Winfrey was born in rural Mississippi where her grandmother was so poor that she would sometimes dress Oprah in clothes made from potato sack and for that, she would get teased by her classmates. Grandma Lee was also rather strict as she would beat Oprah with a stick if she misbehaved or didn't sing the church hymns and choirs correctly. But despite being poverty stricken and strict, her grandmother was very encouraging and taught Oprah how to read the bible before the age of three.
The eye is an extremely diverse organ, ranging in complexity across and within animal phyla. Here, a comparative approach is taken to outlining the diversity of the eye forms within vertebrates and invertebrates. The eye morphology of a variety of organisms was examined. Eye function, and placement on the body was also considered. Here, variation in eye form is discussed in relation to the environment the organism is adapted to. It is shown that an organisms eye morphology functions optimally for the ecological niche it occupies. Evolutionary analysis is used to account for the emergence of the different eyes. Convergent evolution is used to justify the similarities in eye types seen in organisms of different species. This analysis begins with the simplest of eye forms composes of single cells, present in the zooplankton larvae. Such primitive forms are identified in mollucs, annelids, cnidarians, and are then compared to more advanced eye forms contain lenses. This comparative approach provides a breadth of examples of vertebrates and invertebrates, making visible, the diversity of eye morphology within the animal kingdom.
There is a real fear the people will become addicted to virtual reality. There has not been many studies into the effects of Virtual reality on the brain. But Psychiatrist, Keith Albow, writes that Facebooks purchase of Oculus Rift will make virtual reality technology available to everyone, including teenagers. He fears that it will be highly addictive and it will make people psychiatrically ill. He has called on government to carry out trials on virtual reality to ensure that people are aware of the side effects which may include “addiction, depression, attention deficit disorder, anxiety or delusional thinking”. (Anon.,
Fresh Water turtles are small, yet amazing creatures to have and care for in your home. River Cooters, Red Eared Sliders, and Painted turtles are all common pet’s found in America. Though turtles are fun to have around they do require special care just like any other pet would. In most cases they make great pets but turtles aren’t the easiest pets to have so depending on your lifestyle you should think about how much time you’re willing to put into a turtle. They are usually cheap to buy yet the equipment for your turtle can get expensive. Along with cost you must find the time to put into this pet. They need nice set ups to live in as well as attention and proper handling.
Arthropods are animals belonging to the phylum Arthropoda, which is the largest of all phyla in the Animal Kingdom, with more than one million species, making them almost 80% of the whole kingdom. These include insects, arachnids, crustaceans and many more, most of which are quite small, the biggest being the Japanese Spider Crab with a leg span of 3.5 meters and the smallest being the microscopic Plankton.
Have you ever wanted to slap eight people at once? Or if you're more of a mushy, touchy, feely person, have you ever wanted to hug eight people at once? An octopus can do either or both of these if they want to! So you know an octopus is lucky being able to do this but what's an octopuses habitat? Since they can slap eight things at once do they have predators? Or since we're on the facty facts subject where do they live?
Oprah Winfrey was born on January 29th, 1954 in Kosciusko, Mississippi to a unmarried teenage mother. Her mom and dad are Vernita Lee and Vernon Winfrey, her father is a coal miner, turned into a barber, turned into a city councilman who had been in the armed forces when oprah was born. After Oprah was born, her mother traveled north and oprah spent her first 6 years living in rural poverty with her maternal grandmother. Oprah was so poor that