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.
Bilateral symmetry is a key characteristic shared by these worms. They vary in size from several millimeters to several inches upon reaching adulthood and have bodies containing three distinct and separate layers of tissue. Each layer of tissue contains specific organs and organelles; at the innermost regions are vital organs such as the heart, kidneys, liver and central nervous system. These worms have blind guts, which means that they have mouths but lack anuses. The worms have central nervous systems, as do most other multicellular organisms. However, their nervous systems have longitudinal fibers rather than net shapes. Platyhelminthes have dorsoventrally flattened shapes and reproduce primarily as hermaphrodites. They feed on smaller organisms, including microbes and bacteria, and occasionally consume smaller worms and insects too. Species live in many major habitats, including the digestive tracts and intestines of other living organisms such as many warm-blooded animals and humans.Learn More
Platyhelminthes, also known as flatworms, are hermaphrodites, meaning individuals of the species produce both sperm and eggs. These are released from the platyhelminthes where they become cross-fertilized by other platyhelminthes. Two types of platyhelminthes, trematoda and cestoda, lay eggs constantly. The turbellarian class has a seasonal cycle. Turbellaria also reproduce asexually by dividing. Turbellaria are the only class able to regenerate body parts.Full Answer >
Platyhelminthes, better known as flatworms, play important roles in marine, freshwater and terrestrial ecosystems, and several species are dangerous parasites of humans. Flatworms fill a variety of niches in addition to parasitic, including a variety of nutrient sources. Flatworms have been an important part of biological communities since well before any animals emerged on land.Full Answer >
Organisms in the kingdom Plantae, commonly referred to as plants, are multicellular, have specialized reproductive organs, unique cell structures and produce food using photosynthesis. This kingdom includes all land plants and some aquatic organisms as well. Plants are remarkably different from animals in appearance, but have important biological distinctions as well, especially at the cellular level.Full Answer >
The Phylum Sarcodina is comprised of protozoan, or sarcodines, that share several characteristics; sarcodines have long, trailing cytoplasm and use unique cytoplasmic feet, or extensions, called pseudopodia to facilitate movement. Sarcodines also use pseudopods to feed, and they reproduce either sexually or asexually, depending on the species.Full Answer >