organization rules…. question: what class is this? how do you know when to come here? why do you...
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In Biology…….. The activity that involves grouping and naming is called classification. The branch of Biology that involves classification of organisms is called taxonomy!! Not to be confused with taxidermy!TRANSCRIPT
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Organization rules…
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Question: What class is this?
How do you know when to come here?Why do you come to this school?Which block is this?
The answers to these questions are all based on a system of organization that the school follows. Who made these rules? (my personal favorite question!!)
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In Biology……..• The activity that involves grouping and naming is called
classification. • The branch of Biology that involves classification of
organisms is called taxonomy!!
Not to be confused with taxidermy!
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Classification systems have 2 main purposes:
1. To identify organisms
2. To provide basis for recognizing groupings/ relationships between organisms
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Keep in mind:
• Classification systems are artificial. They are developed by scientists to deal with the great diversity of life (currently we’ve named 1.5 million organisms…estimates are that there may be as many as 10 million !!!)
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What are some practical uses for a biological classification system?
• Good bug, bad bug?
• Berries at the bog…
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History of classification (1):
• 4th century BCE: Aristotle observed and grouped over 500 different animals.
• At the same time, Theophrastus grouped plants as
herbsshrubstrees
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But, with the increase in travel and the invention of the microscope…
we needed a more efficient, effective system to deal with the increase in information.
History of classification (2):
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• Introducing…. Carl Linnaeus• Founder of modern Taxonomy
Born in SwedenStudied at many universitiesMade 4600km expedition to Lapland, where he identified100 botanical species1735, he published Systema Naturae, his
classification of plants based on their sexual parts
1707-1778
1707-1778
History of classification (3):
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Linneaus:• Used structural features of organisms• Recognized that the more features have in
common, the closer their relationship• Created rules for assigning names to
organisms• Used a two word system for identifying each
kind of organisms: known as binomial nomenclature
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Binomial nomenclature
• It is a two word Latin namefirst name is the genussecond name is the species
name
• Both together we call the species name
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Examples: Genus: Canis, meaning dogSpecies: familiaris, meaning
domesticatedSpecies name: Canis familiaris
Genus: Felis, meaning catSpecies: catus, domestic Species name: Felis catus
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The Advantages of Binomial Nomenclature
• Advantage 1: Uses one language because descriptions and different names in different languages = confusion!!!
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What is it?
an animal with prickly spikeslives in the watercalled an Itik in Inutitutcalled an ourson in French
It’s a sea urchin!!
Paracentrotus lividus
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Advantage 2: Binomial Nomenclature indicates similarities between organisms.
Example:Genus: Ursus, meaning bear
U. maritimus
U. americanusU. horribilis
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Ailuropoda melanoleuca Phascolarctus
cinereus
Fooled you…
not bears at all…
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Advantage 3: Common names can be confusing and misleading.
Examples: A starfish is not a fishEchinodermata (Spiny-skinned Tide Pool Creatures)
Pisaster brevenspinus
Ringworm is not a wormIt’s a skin infection caused by fungus
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Advantage 4: People use many words to name the same organism depending on where they live (same language).
Example: puma = cougar = mountain lion = panther
Felis concolor
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Current classification
• Today, we use seven categories by which to classify each type of organism:
• Each category is called a taxon (7 taxa in all)
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Kingdom ( most general)Phylum
Class Order
FamilyGenus
(most specific) Species
KPCOFGSCan you find a mnemonic for this?
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King Phillip Came Over For Good Spaghetti
Kevin’s Poor Cow Only Feels Good Sometimes
Keep Pond Clean Or Froggy Gets Sick
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Examples:
Kingdom Animalia Animalia Animalia
Phylum Chordata Chordata Arthropoda
Class Mammalia Mammalia Insecta
Order Primates Primates Diptera
Family Hominidae Pongidae Muscidae
Genus Homo Pan Musca
species sapiens troglodyte domestica
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Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Mammalia
Order Sirenia
Order Cetacea Order Tubulidentata
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Figure 1.14 Classifiying life from Biology, Campbell Reese page 13