In biological classification, taxonomic rank is the relative level of a group of organisms (a taxon) in a taxonomic hierarchy. Examples of taxonomic ranks are species, genus, family, order, class, phylum, kingdom, domain, etc. Living organism classifications are commonly made on the basis of necessity and are often shallow. Anglo-Saxon terminology, like worm and fish, has been used to refer to any crawling creature, such as a snake, earthworm, intestinal parasite, or dragon, as well as any swimming or aquatic creature. Although the terms fish, crayfish, and starfish are all used interchangeably, there are more anatomical differences between a shellfish and a starfish than there are between a bony fish and a man.
2. The History of Animal Taxonomy
People who live close to nature usually have a good understanding of the local fauna and plants that are significant to them, as well as many of the broader groups of living creatures (e.g., fishes, birds, and mammals). Their knowledge, on the other hand, is based on need, and such people rarely generalize.
3. The Animal Phylum
Animal species are classified into one of seven phyla, or groups, after the animal kingdom:
- Porifera: Sponge-like marine organisms which can be found in every ocean on the planet.
- Cnidaria: A group of mostly marine invertebrates with about 11,000 species. Coral, jellyfish, and anemones are some examples.
- Platyhelminthes: Flatworms that are parasitic. Because they lack either respiratory or circulatory systems, oxygen is instead diffused across their body. Tapeworms and flukes are two examples.
- Annelida: Segmented and symmetrical worms with a neurological system, breathing system, and sense organs. They are more complicated than Platyhelminthes. The common earthworm