Progression of Classification

384 BC-2013

350 BC Aristotle

  • Greek philosopher
  • divided organisms into 2 groups - plants and animals
  • divided animals into blood and bloodless
  • also divided animals into 3 groups according to how they moved - walking, flying, or swimming (land, air, or water

Times

1400's


· Classifications of things based on....


· Similarities and resemblances


· Characteristics are inherited


1500s-1800s


· Knowledge comes from close observation and visual description


· Classification based on reproduction and relationships


· Competition and struggle to survive leads to selection of successful traits over time


1900s-2000s


· Earth is approximately 4.5 billion years old.


· The structure of DNA can be read


Top Historians

The Present day Classification

The modern classification is an extension of the system of classification proposed by Carolus Linnaeus. The present system of classification involves a series of graded taxonomic ranks called taxa which include phylum and family in addition to the four taxa introduced by Linnaeus.