Biological scientists estimate that collectively the earth’s 5 come 40 million species of organisms (depending ~ above the estimate you select to believe) comprise a full of some 2 trillion tons of life matter, or biomass. The plants consist of well end 90 percent the the biomass. The animals, the focus of this article, make up only a small percentage the the biomass, but they account for the bulk of species. 


In accordance v the Linnaeus method, researchers classify the animals, as they execute the plants, ~ above the communication of shared physical characteristics. They location them in a power structure of groupings, start with the kingdom animalia and also proceeding with phyla, classes, orders, families, genera and also species. The animal kingdom, comparable to the plant kingdom, comprises groups of phyla; a phylum (singular for phyla) contains groups that classes; a class, groups of orders; one order, teams of families; a family, teams of genera; and also a genus (singular that genera), groups of species. As created by Linnaeus, the scientists call an animal species, as they execute a plant species, by the name of the genus, capitalized, and also the species, uncapitalized. Therefore far, the scientists have actually classified and named something over a million animal species. Without doubt, they have millions an ext to go. 

Taxonomists, biological scientists that specialize in classifying and naming the living organisms, group the multicellular, separately mobile organisms the eat various other organisms right into the kingdom that animalia. The taxonomists recognize that the animals, uneven the plants, possess committed tissues that might be organized into even more devoted organs, and also they identify that many animals, especially the more evolutionarily advanced species, have “bilateral symmetry,” which way that the right and left sides are basically mirror photos of each other. Critically, specifically in the desert, animals, unlike plants, regularly utilize your mobility to look for refuge from environmental stresses such together intense warmth and an extensive drought.

You are watching: Which characteristics do scientists use to group species

Animal Populations

Worldwide, the animal population consists of varieties numbering somewhere in the millions. The largest, the blue whale, might exceed 100 feet in length and also 150 tons in weight. The smallest well-known animals, because that instance, a parasitic wasp the taxonomists have actually named Dicopomorpha echmepterygis, measure no more than a few thousands that an inch in length.

The many abundant and diverse pet communities occupy earth’s most biologically fertile regions, because that example, the dry rainforests, where the varieties of life organisms most likely number in the millions. Vice versa, the the very least abundant and diverse pet communities live in the the very least biologically fertile regions, in particular, deserts favor those of our Southwest, where the types of living organisms most likely number in the 10s to hundreds of thousands.

The organic richness that a dry rainforest contrasts sharply with the organic impoverishment of our deserts. The net biological productivity of a usual area in a tropical rainforest might exceed the of a equivalent area in our desert soil by a element of 40 come 50 times, follow to the physical web site. Moreover, follow to the dry Rainforest Biome web site, “Scientists think that the tropical tropical of the people might hold up come ninety percent that the plant and also animal types on earth.” In a record called “Tropical Biomes,” Professor Ralph E. Taggart, Michigan State University, stated “The total organic diversity of only a few square kilometers of wealthy tropical rainforest can exceed the of entire regions in the temperate zone. Most of the plants and animals of the civilization are discovered in the complex mosaic that natural neighborhoods that comprise this biome.” Nevertheless, our deserts host a diverse and highly adjusted community the animals.


The animal Community

Taxonomists typically divide the animal kingdom right into two “subkingdoms,” which encompass the invertebrates (animals without backbones) and vertebrates (animals with backbones). As with the plants, taxonomists turn the subsequent pet groupings and classifications, from phyla through genera, into a churning landscape the is merely a component of the clinical process. Relying on their scholastic roots and also research, lock divide and also re-divide the animal community in countless different ways, frequently regrouping, reclassifying and even re-naming types as castle go. Some, referred to as “lumpers,” identify varieties as belonging to the exact same group even though there may be little differences. Other scientists, referred to as “splitters,” determine the same types as belonging in unique groups since of the same small differences. The lumpers produce a fairly simple taxonomy, the splitters, a much more facility taxonomy.

See more: What Is The Past Tense Of Leave, Left Definition And Meaning


Classifying an Invertebrate

In ours deserts, the invertebrate subkingdom has phyla such as arthropods (insects, centipedes, spiders, scorpions, desert shrimp and also many others), mollusks (snails) and also annelids (earthworms). In the desert, also as throughout the world, arthropods, measure in regards to abundance and diversity, rank at the height of every the pet phyla. One elegant insect, the monarch butterfly, offer as instance of exactly how the group system functions for the invertebrates.