Paramecia belong to the phylum Protozoa, which falls into the kingdom Protista. Paramecia are considered free-ranging protozoans that are generally very small in size. There are eight species of paramecium, which vary in appearance but share the characteristics of being single-celled organisms that are covered with tiny delicate hairs called cilia.Know More
Paramecia reside primarily in aquatic environments. Some live in oceans and seas, while others inhabit lakes, rivers and streams. These organisms are equipped with cilia for facilitating life in watery locations. Cilia essentially act as rudders to help propel organisms through the water. They also serve as integrated utensils and allow paramecium to obtain and ingest food particles.
Paramecia have oral grooves on their ventral surfaces, which run diagonally to their mouths and gullets. The gullets of paramecium are relatively large and aid digestion by transforming food particles into vacuoles, which are tiny storage sacs. Paramecia may have two or three contractile vacuoles, which expand to accommodate food and help to regulate water content within cells. Some vacuoles serve as excretory structures as well, by eliminating metabolic waste.
Paramecia have two nuclei, as do most protozoa. These nuclei contain genetic information that is stored and replicated to offspring upon reproduction. Macronuclei, the larger of the two nuclei, allows paramecia to survive, while micronuclei enable reproduction.Learn more about Zoology
The organisms belonging to phylum Nematoda are roundworms, examples of which are ascaris, trichinella, filaria worms, hookworms and pinworms. Nematodes are part of a group of animals, known as ecdysozoans, that periodically shed their skin as they grow. Although nematodes are frequently found in nature, numerous species live as internal parasites in most vertebrates, including humans.Full Answer >
Planaria are non-parasitic flatworms that are grouped in the phylum Platyhelminthes. This puts planaria in the same general family as tapeworms and liver flukes. Planaria are distinguished by their lack of a body cavity and circulatory system.Full Answer >
Vertebrates are found in the phylum Chordata. The subphylum that vertebrates belong to is called Vertebrata. Chordates are animals that possessed a notochord, a nerve cord, a tail and pharyngeal gill slits at some time during their lives.Full Answer >
Organisms in the Phylum Platyhelminthes, commonly known as flatworms, share several characteristics, including bilateral symmetry, bodies that lack internal cavities and central nervous systems. Flatworms and tape worms vary considerably in appearance but share key biological characteristics that distinguish them from worms and other similar species. These organisms live primarily in dirt and soil and inhabit water and land areas around the world.Full Answer >