• The hierarchical classification system of organisms in biology is used to organise and?group similar organisms together?so that they can be more easily understood
  • A hierarchical system is one in which larger groups contain smaller groups with no overlap between groups

   

• There are several taxonomic ranks that exist
• All taxonomic ranks or 'taxa' make up a 'taxonomic hierarchy'
• Species is the lowest taxonomic rank?in the system
  • Similar species can be grouped in a?genus
  • Similar genera can be grouped in a?family
  • Similar families can be grouped into an?order
  • Similar orders can be grouped into a?class
  • Similar classes can be grouped into a?phylum
  • Similar phyla can be grouped into a?kingdom
  • Similar kingdoms can be grouped into a?domain

   

• Domains are the highest taxonomic rank?in the system
• There are a few different rhymes that exist to help you remember the different ranks in the taxonomic classification system. You can always make up your own but the one below is super helpful!
• The first letters of all the different ranks below the domains can be remembered as:
  • Kings?Play?Chess?On?Fancy?Gold?Squares
  • Kingdom?Phylum?Class?Order?Family?Genus?Species

   

Classification of an organism in the Eukarya domain

• Eukarya?is the domain of all eukaryotes, distinguishable from Bacteria and Archaea which are both prokaryotic domains
• Just like the other domains, Eukarya contains the taxonomic hierarchy of kingdom, phylum, class, order, family, genus and species
• A wolf is an example of an organism in the Eukarya domain
• It can be classified further into its kingdom, phylum, class, order, genus and species
• A wolf belongs to the following taxonomic groups:
  • Domain: Eukarya
  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Mammalia
  • Order: Carnivora
  • Family: Canidae
  • Genus:?Canis
  • Species:?lupus

   

• The?Hibiscus rosa-sinensis?is another example of of an organism in the eukarya domain
• It is a colourful flowering plant
• It belongs to the following taxonomic groups:
  • Domain: Eukarya
  • Kingdom: Plantae
  • Phylum: Angiospermae
  • Class: Dicotyledonae
  • Order: Malvales
  • Family: Malvaceae
  • Genus:?Hibiscus
  • Species:?rosa-sinensis

   

A Classification Table

• A species is a group of organisms that are able to reproduce to produce fertile offspring
• Binomials are the scientific name of a species
• It consists of the organism’s?genus?and?species?name in modern Latin
• For example, the binomial for humans is?Homo sapiens?and the binomial for dogs is?Canis familiaris
• Binomials are extremely useful for scientists as they allow for species to be?universally identified?- the binomial for a species is the same across the entire globe