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13 Cards in this Set
- Front
- Back
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Groups of vertebrates |
Mammals Fish(bony and cartaligenous) Reptiles Amphibians Birds |
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Two groups that may also be considered veterbrates and why |
Hagfish Lamphreys
Have a cranium (craniates) and have a backbone that is underdeveloped |
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Tree of deutrsomes- to vertebrates |
Deutroses splits- echinoderms + chordates , chordates splits - vertebrates + cousins of veterbrates |
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Chordate groups and characteristics |
Cephalochordates ,tunicates, craniates ( including vertebrates or lizards) These characteristics are shared by craniates and vertebrates
-Notochord ( support muscle (anchors muscles) , induces formation of neural tube/canal -Hollow dorsal vessel (hollow tube on top of notochord)
-Spinal nerves -Ganglia (accumulation of neurons) -Post anal tail (dorsal post anal body appendage (dorsal +behind anus(-specufic to veterbrates)) -Metameric muscle blocks - pharangeol pouches/slits |
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Tissue layers in vertebrate embryo |
Neural tube- develops into central nervous system (brain and spinal cord) Somate( mesoderm that specialises into vertebrae) Notochord (support for muscles - induces formation of neural tube) Mesoderm (middle germ layer of early embryo) Archenteron ( space insude digestive tract) Endoderm (inner germ layer of early embryo) Ectoderm (outer layer of cells) |
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Deutrosome embryonic characteristics of veterbrates |
Indeterminate -if cells separated they have the still have capability of developing into organism
Enterocoely-folds of archenteron form the coelom
Radial cleavage- early cells divisok occur parralellel to the axis
Deutrosomy- blastopore develops into anus |
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Three criteria used to construct phylogenies |
- relationships represented by a branching pattern - relatedness based on shared characters it's -species are directly or indirectly related through common ascestory |
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Difference between definition and diagnosis |
Definition - define a group through Thier common anscestory Diagnosis - diagonsoe a group ok the basis of shared characteristics |
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Three major groups of metazoans (animals) included in deutrosomes |
Echinoderms, chordates ( craniates,vertebrates) hemichordates |
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Term for lamphrey larvae |
Ammocete |
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Two key roles of notochord |
Support for muscles and CNS , initiates neural tube development |
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Organism that demonstrates chordate characteristics well |
Lamphrey larvae |
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Example of cephalochordate |
The lancelet ( amphioxous) |
