Biologists use 7 Levels of Classification - PowerPoint PPT Presentation

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Biologists use 7 Levels of Classification

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Biologists use 7 Levels of Classification Linnaeus named about 4000 species Carolus Linnaeus developed systems for naming & organizing species into groups. – PowerPoint PPT presentation

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Title: Biologists use 7 Levels of Classification


1
Biologists use 7 Levels of Classification
  • Linnaeus named about 4000 species
  • Carolus Linnaeus developed systems for naming
    organizing species into groups. Today scientists
    have named over 1 million species with help of
    modern technology
  • NAMING SPECIES
  • USING SCIENTIFIC NAMES
  • Organisms can be classified into 7 levels
  • Dichotomous keys and field guides help people
    identify organisms

2
NAMING SPECIES
  • A genus is a group of species that have similar
    characteristics. Ursus groups all are bears
    include Ursus arctos(grizzly) Ursus
    maritimus(polar) .
  • Linnaeus developed a binomial nomenclature system
    for modern taxonomy. Binomial 2 names and
    nomenclature list of names. It is a system of
    naming something using 2 names or words (most are
    Latin terms).
  • If genus name isnt included, species may by
    mystery (all 3 below are species gracilis,
    meaning slender/graceful in Latin. Genus always
    comes first, first letter is capitalized, and
    entire name is in italics. Species name is second
    is italicized too, all in lower case.

3
7 Levels of Classification
  • The largest level is the kingdom, the group with
    the most species. Below is an example for a
    housecat.
  • Kingdom (Animalia- the animals)
  • Phylum (Chordata- animals with backbones)
  • Class (Mammalia-mammals that nurse their young)
  • Order(Carnivora-carnivores that kill or eat other
    animals)
  • Family(Felidae-the cat family)
  • Genus(Felis-housecats, cougars many others)
  • Species(catus-all housecats, no matter what
    breed)
  • The more names an organism shares with another
    organism, the more closely related the 2
    organisms are.

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5
7 Levels of Classification
  • Scientists can compare very broad categories of
    organisms, like kingdom phyla, or very specific
    categories, like species.
  • Can remember classification levels by Kings Play
    Chess On Fat Green Stools.
  • A human is classified like this
  • Kingdom Animalia, phylum Chordata, class
    Mammalia, order Primates, family Hominadae, genus
    Homo, and species sapiens.

6
Dichotomous Key/Field Guide
  • Taxonomists have come up with a tool to identify
    organisms like beetles (over 300,000 known
    species). A dichotomous key asks a series of
    questions that can be answered in only 2 ways.
    Each answer leads to another question with only 2
    choices. Eventually, you will identify the
    organism.
  • The questions in a dichotomous key gradually
    narrow down the list of possible organisms.
  • Field Guides are another tool for identifying
    organisms. It includes paintings or pictures of
    familiar species. Flower guides may start with
    the flowers color, while bird guides are
    arranged by orders families. Field guides also
    include maps where organisms live.

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