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biodiversity
number of species, genera, etc
classification
assigning organisms to a hierarchical group
phylogeny
evolutionary history
taxonomy (taxon, taxa)
naming of groups of organisms
competing philosophies
cladistic v. evolutionary
Evolutionary
taxa should share recent common ancestry and morphological similarities, may generate some paraphyletic taxa
Cladistics
all taxa should be clades, monophyletic and holophyletic
monophyletic
lineage with a single common ancestor
holophyletic
a lineage including all descendants of a single common ancestor
paraphyletic
a lineage including some but not all descendants of a single common ancestor (NOT a clade)
polyphyletic
a lineage or trait found in independent lineages (NOT a clade)
plesiomorphic
ancestral characteristic
apomorphic
derived characteristic
symplesiomorphic
shared, ancestral characteristic
synapomorphic
shared, derived characteristic
autapomorphic
unshared, derived characteristic
homologous
similar based on shared common ancestry
analogous
similar due to common function (not ancestry)
homoplasy
analogous trait
convergent evolution
evolution of analogous characteristics in distinctly related clades
divergent evolution
evolution of homologous characteristics into new forms/phenotypes in the same clade
dendrogram
a branching diagram that represents the relationships of similarity among a group of entities
cladogram
diagrams which depict the relationships between different groups of clades
phylogram
depict either the amount of evolution occurring in a particular gene sequence or the estimated duration of branches
horotely
A normal or average rate of evolution per million years, of genera within a given taxonomic group
tachytely
rapid evolution, or evolution that occurs faster than the average rate for a particular group of organisms.
bradytely
evolution that occurs at a very slow rate
clade
a lineage of organisms that is derived from a single common ancestor and contains all descendants
grade
a group of organisms that shares similarity but not by a shared common ancestor or excluding some descendants
paralogs
ancestral gene duplicated and changed within a species, producing 2 different related genes
orthologs
ancestral gene shared by 2 different species
phyla in excavata
Diplomonadida, Kinetoplastida, Euglenophyta, Parabasala
phyla in SAR
Bacillariophyta, Phaeophyta, Dinoflagellata, Apicomplexa, Ciliophora, Foraminifera, Radiolaria
phyla in Archaeplastida
Rhodophyta, Chlorophyta (includes plants)
phyla in Unikonta
Gymnamoeba, Myxogastrida, Choanoflagellata (includes animals and fungi)
Diplomonadida
2 equal-sized nuclei
heterotrophic
free-living and parasitic
2, 4, or 8 flagella
lack mitochondria (secondarily)
most anaerobic
many live in gut of insects or vertebrates
Giardia lamblia -intestinal parasite of humans and other vertebrates
Parabasala
parabasal body (large modified Golgi apparatus)
heterotrophic
axostyle
4 to 1000's of flagella
anaerobic
some with intra-cellular bacteria and surface attached spirochaetes
Trichomonas vaginalis -human urogenital tract
Trichonympha -termite gut
Kinetoplastida
heterotrophs, mostly parasitic (part of Euglenozoa?)
kinetoplast (mass of DNA w/in single large mitochondrion)
trypanosomes, Trypanosoma brucei -African sleeping sickness, vector = tsetse fly
trailing flagellum attached to cell by undulating membrane.
Bodo saltans, free living kinetoplastid
Euglenophyta
colorless heterotrophs and green photoautotrophs
longitudinal binary fission
Euglena and Peranema
Euglena
2 flagella in flagellar reservoir
1 locomotory and 1 non-emergent or short
stigma
paraflagellar body
phototaxis
euglenoid (peristaltic) movement
chloroplast with 3 membranes
Peranema
1 trailing and 1 leading flagellum (thickened by paraxial rod except at tip)
2 flagella
transverse flagellum in circumferential groove (cingulum)
longitudinal flagellum in longitudinal groove (sulcus)
theca -plates of cellulose in alveoli
palmella, bloom
Bacillariophyta
diatoms
photosynthetic
marine, fresh water
cell wall & siliceous frustule, 2 valves
centric, pennate
asexual reproduction with decrease in size
gametic meiosis
diatomaceous earth
Phaeophyta
brown algae
marine
photosynthetic macroalgae
kelp
holdfast, stipe, thallus, blade, meristem
algin
sporic meiosis
Dinoflagellata
marine and freshwater dinoflagellates
most free-living, some endoparasites
many photosynthetic
chloroplasts of symbiotic origin
red, brown, or golden pigments
longitudinal fission
ex: Gymnodinium, Ceratium, Noctiluca, Symbiodinium
Apicomplexa
sporozoans
apical complex
flagellated microgametes
pellicle = 3 membranes (large alveolus)
complex life cycles -haploid dominant
sporozoite
trophozoite
merozoite
gamonts (micro- and macrogametocytes)
micro- and macrogametes
oocyst
ex: Plasmodium -4 spp.
malaria causal agent
vector -Anopheles
Ciliophora
freshwater, marine, soil
heterotrophic (some with endosymbiotic algae)
most free-living, some parasites
complex organelles, complex behavior
oral groove, cytostome, cytopharynx, food vacuole, cytoproct
contractile vacuole
cilia, cirrus (-i), membranelle
complex pellicle & alveoli, extrusomes
myoneme
Paramecium multimicronucleatum, Didinium, Vorticella, Euplotes, rumen ciliates
Foraminifera
foraminiferans
mostly marine
benthic or planktonic
reticulopodia
calcareous, chambered test
mermaid's pennies, large fossil species
white cliffs of Dover
Radiolaria
radiolarians and heliozoans
marine plankton, freshwater
delicate siliceous tests with apertures
axopodia
Rhodophyta
red algae
marine
macroalgae
most in deep, cold water (red pigments)
carrageenan, agar
Porphyra tenera -nori
Chlorophyta
green algae
photosynthetic, chlorophyll
motile and non-motile forms
large cup-shaped chloroplast
food storage as starch
many colonial species
Chlamydomonas, Volvox
Gymnamoeba
naked amoebas, sarcodines
pseudopods (lobopodia)
marine, freshwater
most = benthic, some planktonic
Amoeba
many parasitic forms
Entamoeba hystolytica, E. gingivalis
Myxogastrida
plasmodial slime molds
plasmodium -multinucleate mass of protoplasm
super cell
heterotrophic
complex life cycle (sporic meiosis), sclerotium
Physarum polycephalum -yellow slime mold
Choanoflagellata
sister group of Metazoa
marine and freshwater
tiny cells <10 micrometers
solitary or colonial, sessile or motile
single flagellum within collar of microvilli
filter feeding
Proterospongia