Taxonomy Science of Classification (nomen = name) Necessary because of… –Size –Convergence
330,000 different species of beetles British entomologist Haldane is reported to have said that God must have "an inordinate fondness for beetles."
Karl von Linnae Botanist obsessed with Latin Changes name to Carolus Linnaeus First scientist to use ♂ and ♀ symbols for male and female
Latin Classification Pro: –Non-dynamic Con: –Length
1775 Linneaus writes Systemate Naturae physalis amno ramosissime ramis angulosis glabris foliis dentoserratis became Physalis angulata Physalis angulata
Linnean Taxonomy Divides organisms into seven divisions based upon physical, chemical, behavioral and evolutionary characteristics For practical use, each organism is assigned two names BINOMIAL NOMENCLATURE
PHYLUM The best known animal phyla are the Mollusca, Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Arthropoda, Echinodermata, and Chordata, MolluscaPoriferaCnidaria PlatyhelminthesNematodaAnnelida ArthropodaEchinodermata Chordata Although there are approximately 35 phyla, these nine include the majority of the species.
Species The most commonly used definition of species was first coined by Ernst Mayr.Ernst Mayr Species are "groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups populations reproductively
American Lobster Market Squid Blue Mussel Virginia Oyster European Oyster Phylum ArthropodaMollusca Class MalacostracaCephalopod a Bivalvia Order Decapoda MytiloidaPterioida Family NephropidaeLoliginidaeMytilidaeOstreidae Genus HomarusLoligoMytilusCrassostreaOstrea Species americanusopalescensedulisvirginicaedulis
Dichotomous Key “two choices” A dichotomous key must be: –Accurate –Precise –Plastic (able to incorporate new species with relative accuracy)
Lab: Creating A Dichotomous Key For NE Illinois Foliage Purpose: To create an accurate, precise and plastic dichotomous key for ten (10) different species of plant from NE Illinois. Method: Dichotomous Key Your dichotomous key will be tested for accuracy, precision and plasticity (with a mystery leaf not in the original set of 10)