phylogeny & cladistics Flashcards
Domain
the highest taxonomic category; above the kingdom level
- Archaea
- Bacteria
- Eukarya
Kingdom
in Linnaean classification, the taxonomic category above phylum
Phylum
in Linnaean classification, the taxonomic category above class
Class
in Linnaean classification, the taxonomic category above order
Order
in Linnaean classification, the taxonomic category above family
Family
in Linnaean classification, the taxonomic category above genus
Genus
in Linnaean classification, the taxonomic category above species; also the 1st part of a binomial is the name of the _____ to which the species belongs
Species
the lowest taxonomic category
Taxon/taxa
a named taxonomic unit at any given level of classification
Basal taxon
refers to a lineage that diverges early in the history of a group and hence lies on a branch that originates near the common ancestor of the group
Sister taxa
groups of organisms that share an immediate common ancestor and hence are each other’s closest relatives
Outgroup
is a species or group of species from an evolutionary lineage that is known to have diverged before the lingeage that includes the species we are studying
Clade
a group of species that includes an ancestral species and all of its descendants
Grade of organization
a group of organisms that share the same level of organizational complexity or share a key adaptation
Monophyletic
“single tribe”
- equivalent to a clade
- consists of an ancestral species and all of its descendants