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15 Cards in this Set
- Front
- Back
1) Give 3 example of a protostome.
2) What is a characteristic of protostomes? 3) Where are they in relation to Deuterostomes, Chordates, and Somitochordates? |
1) Annelids, Arthropods, Molluscs.
2) Blastopore forms mouth. 3) Protostomes came before Deuterostomes, Chordates, and Somitochordates, respectively. |
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1) Give two examples of Urochordates.
2) To what clade do Urochordates belong? |
1) Tunicates and Sea Squirts.
2) Urochordates are CHORDATES. |
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Name the 5 chordate synapomorphies.
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1) Notochord
2) Dorsal Hollow Nerve Chord 3) Postanal Tail 4) Iodine Binding Structure 5) Pharyngeal Pouches/Slits |
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1) Give an example of Cephalochordates.
2) To what clade do Cephalochordates belong? 3) What is a characteristic of Cephalochordates and from what are they derived? |
1) Lancelets
2) Cephalochordates are Somitochordates. 3) Cephalochordates have Myomeres derived from Somites. |
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1) What are 'myomeres'?
2) Who has them? 3) From what are they derived? |
1) Myomeres are segmental muscle blocks.
2) Cephalochordates have myomeres. 3) Myomeres are derived from Somites. |
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What is PAEDOMORPHOSIS?
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PAEDOMORPHOSIS is retention of juvenile traits in adulthood.
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What two major groups are contained within Clade "Craniate"?
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Hagfish and Vertebrates
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What are 5 craniate synapomorphies?
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1) Cranium
2) Complex Sense Organs 3) Large 3 Part Brain (Forebrain, Midbrain, Hindbrain) 4) Neural Crest Cells 5) Heart, Gills, Hemoglobin. |
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What are some characteristics of Hagfish (Clade Myxiniforme)?
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They are craniates, but lack vertebrae.
They also lack jaws and paired fins. |
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What are the two basic mechanisms of 'tube-within-a-tube' design?
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– Separation of embryo cells into 3 layers (GERM LAYERS) that each produce different structures.
– Folding and migration of those layers. |
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The notochord is formed from which germ layer?
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The notochord is formed from the MESODERM.
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The DHNC is formed from which germ layer?
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The DORSAL HOLLOW NERVE CORD forms from rolling up of ectoderm overlying notochord.
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What is the important relationship between neural crest cells and craniates?
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Neural Crest cells migrate through body to make pigment cells, tooth dentine, parts of skull, nerves, & brain.
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The mesoderm differentiates into three different parts. What are they?
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1) Somites (myomeres and vertebrae)
2) Intermediate mesoderm (kidneys) 3) Lateral Plate mesoderm (blood vessels, heart, coelem). |
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Where is the gut during development?
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The gut and its associated organs are suspended in the body by the MESENTARIES (which are formed by the lateral plate mesoderm).
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