Distinguishing features of organisms in the Phylum Echinodermata include a lack of body segmentation, radial symmetry and life adaptations for marine environments. The Phylum Echinodermata includes more than 6,000 different species. Most organisms in this category take the form of starfish and have endoskeletons, which appear in humans, too, and give organisms the ability to move and grow.Know More
Of all the phyla in the animal kingdom, the Phylum Echinodermata most closely resembles the Phylum Chordata, which includes humans. Echinoderms, like humans, have distinct spinal columns. They have coeloms deriving from digestive tubes, which resembles the internal digestive system of humans and many animals. Like people, organisms in the Phylum Echinodermata contain endoskeletons that form primarily from hard, dense calcium carbonate. Sharp spikes radiate out from the skeletons of echinoderms, giving them a distinct appearance.
In addition to starfish, this phylum includes other aquatic species too, such as sea cucumbers, brittle stars and sand dollars. While some, like starfish, contain projecting arms, others have a pentameral design. This design features a body symmetry of five equally sized parts. Echinoderms derive nutrients and water through a water-vascular system. This system involves a network of internal canals that breaks into smaller channels internally, culminating in tube feet. A feature unique to echinoderms is the ability to regenerate organs and limbs upon damage or loss.Learn more about Biology
The three subphylums in Chordata are Vertebrata, Urochordata and Cephalochordata. Vertebrata is the largest group, including such familiar animals as fish, birds, reptiles, amphibians and mammals. Urochordata contains about 4,600 to 5,100 species total, and Cephalochordata contains only 28.Full Answer >
Marine biology is important because by studying and researching ocean and marine environments, marine biologists play a key role in understanding climate change and identifying sustainable and profitable ways humans can use the sea and its resources. Marine biology involves the study of organisms, including viruses, bacteria, plants and animals, living in marine habitats. Marine biologists understand the needs of organisms in these habitats, ultimately helping protect species and reduce human threats.Full Answer >
The main characteristics of the phylum Basidiomycota include the formation of basidia on a fruiting body and the development of basidiospores, according to the Tree of Life Web Project. The basidiospores germinate to form septate hyphae or yeast cells.Full Answer >
Members of Monera, which include the prokaryotic bacteria and cyanobacteria, are single-celled and lack a membrane-bound nucleus. They also lack other membrane-bound organelles, such as mitochondria, and reproduce asexually.Full Answer >