Microtaxonomy Flashcards
- classification at the species level
microtaxonomy
a multilayered science
taxonomy
Greek: __ = order; __ = law
taxis = order
nomos = law
refers to the presence of two or more variant forms of a specific DNA sequence that can occur among different individuals or populations
Polymorphism
French for taxonomy
taxinomie
taxonomy acc. to Simpson
theory and practice of delimiting kinds of organisms and of classifying them
taxonomy acc. to Wilson
science and art
taxonomy acc. to ICZN (International Code of Zoological Nomenclature)
theory and practice of classifying organisms
Steps in taxonomy
- Microtaxonomy
- Macrotaxonomy
the demarcation of species
microtaxonomy
questions asked in microtaxonomy
- What is species?
- What species concept is best?
the classification of species
macrotaxonomy
questions asked in macrotaxonomy
- How do we classify organisms?
- According to genealogy or to degree of similarity… or both?
recognition and description of species and first classification
alpha-taxonomy
classification of species in hierarchical system
beta-taxonomy
understanding the evolutionary factors
gamma-taxonomy
alpha-taxonomy
microtaxonomy
beta-taxonomy
in between micro and macrotaxonomy
gamma-taxonomy
macrotaxonomy
Fundamental concepts of taxonomy
- alpha taxonomy
- omega taxonomy
phases in alpha taxonomy
exploratory and consolidation phase
phases in omega taxonomy
biosystematic and encyclopaedic phases
alpha taxonomy started with the work of who
- Tournefort
- de Jussieu
- Linneaus
- concerned with the description and designation of species
- basis of morphological characters
alpha taxonomy (descriptive taxonomy)
- arrangement of species into hierarchical system of higher categories or taxa
- developed in 20th century
beta taxonomy (macrotaxonomy)
- aspect of taxonomy concerned with intraspecific population and with phylogenetic trends
- attempt is made to account for the origin and development of species
- taxonomists relate to paleobotany which includes all taxa of extinct plant groups
gamma taxonomy
taxonomists in gamma taxonomy relate to __ which includes all taxa of extinct plant groups
paleobotany
- an ultimate perfect system, based upon all available characters
omega taxonomy
provides best picture on classification
consolidation of alpha-omega taxonomy
Three main aims of taxonomy
- Identification
- Nomenclature
- Classification
Two main approaches in taxonomy
- Empirical approach
- Interpretive approach
based on practical aspects, observation of characters etc.
empirical approach
classification is based on interpretation and evolution of a taxon, e.g., phylogenetic system
interpretive approach
The process of individual development from a single cell, an egg cell or a zygote, to an adult organism
ontogeny
evolutionary history
phylogeny
scientific study of ancient plants, using plant fossils found in sedimentary rocks
Paleobotany