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!Fishes 2
Systematics
22
Biology
Undergraduate 4
11/10/2009

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Term
Systematics
Definition
arrangement of diversity into natural classification
Term
endangered species act
Definition
applies to distinct population segment of species which interbreeds when mature
Term
morphological (linnaeus) concept
Definition
smallest group of individuals distinct and distinguishable from all others; can misclassify based on differences that can be maintained w/in an interbreeding group; depends solely on observable morphological differences
Term
evolitionary concept
Definition
population or group of populations that share common evolutionary fate and historical tendencies based on lineage; recognizes more than just genetic and morphological differences; difficult to determine "evolutionary fate"; how much diversity allowed w/in a common evolutionary fate?
Term
Biological (mayr) concept
Definition
group of populations of individuals similar in form and function and reproductively isolated from other pops;includes genetic info; ignores hybridization; dependent on geographic isolation to achieve species status
Term
speciation
Definition
how pops become distinct species? for each pop to become diff evolutionary lineages process whereby gene flow is reduced sufficiently b/w sister pops: allopatric and non-allopatric
Term
allopatric speciation
Definition
with geographic isolation; vicariant, founder, reinforcement
Term
vicariant allopatric
Definition
large pops geographically isolated(little inbreeding)
Term
founder allopatric
Definition
small pop becomes geographically isolated and reproductively isolated via inbreeding, selection, drift
Term
reinforcement allopatric
Definition
early isolation followed by sympatry(living together), but selection against hybrids
Term
non-allopatric
Definition
without geographic isolation; sympatric and parapatric
Term
sympatric non-allopatric
Definition
sister species evolve w/in dispersal range of eachother, but adapt to diff habitats: habitat-dependent assortative mating
Term
parapatric non-allopatric
Definition
sister species evolve in segregated habitats across narrow contact zone, little mixing in spite of proximity
Term
naming a species
Definition
genus always noun, species usually adjective(binomial)epithet; species name can be given to more than one; each new species reported in journal, must have specimens available for study
Term
Type specimens
Definition
holotype, paratype, lectotype, neotype, paralectotype, syntype, topotype
Term
holotype
Definition
single specimen as name-bearing type of species when established, single specimen on which taxon based when no type specified
Term
paratype
Definition
each specimen of type series other than holotype
Term
lectotype
Definition
syntype designated as single name-bearing type speciment subsequent to establishment of nomial species or subspecies
Term
neotype
Definition
single specimen designated as name-bearing type of nominal species or subspecies for which no holotype, lectotype, syntypes, or prior neotype exists
Term
paralectotype
Definition
each specimen of former syntype series remaning after designation of lectotype
Term
syntype
Definition
each specimen of type series from which neither holotype nor lectotype has been designated
Term
topotype
Definition
term for specimen originating from type locality of species or subspecies to which it belongs, whether or not specimen is part of type series
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