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12 Cards in this Set
- Front
- Back
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what are the three subphyla of chordates? |
Urochordata (tunicates) Cephalochordata (lancelets) Vertebrata |
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what are the three classes of tunicates? |
- Ascidiacea: sea squirts - Thaliacea: pelagic tunicates - Appendicularia: live in mucus houses |
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what are three orders of the class Thaliacea (pelagic tunicates) |
- Or. Salpida (salps) - Or. Doliolida (doliolids) - Or. Pyrosomida (pyrosomes) |
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Characteristics of Urochordata (tunicates) |
- body wall (tunic) - produce cellulose/collagen (outside of tunic) - define tunicates by larvae (called tadpole) sensory capabilites (eye and statocyst) apoptosis metamorphosis - convergently evolved w/ sponges - colonial |
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what are the two conditions of colonial zooid tunicates |
- compound condition: share atrium (pinwheel condition) - colonial condition: separate oral & atrial opening |
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What are characteristics of Thaliacea/Appendicularia? |
- live in pelagic zone, planktonic - can't be observed @ surface water - thaliacea oral and atrial siphon 180 degrees apart appendicularia oral and atrial siphon not this way |
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what is the blastozooid and what does it do? |
- gives rise to single egg as it grows -> chokes zooid -> oozoid -> repeats |
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what is paedomorphosis? |
the rentention of juvenile traits as an adult |
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what is marine snow? |
left over detritus of mucus houses that drift to the bottom |
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how many mucus houses can some Appendicularia make in a day? |
16 |
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what are the sexes like in Appendicularia? |
1 - testes develops first and ruptures to release sperm 2 - female catches sperm in mucus net and funnels it to eggs 3 - ovary swells until it bursts 4 - eggs float and hatch |
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what are traits of Cephalochordata (lancelets) |
- all marine - all 4 chordate characteristics - muscles arranged in myotomes (share w/ vertebrates) - tentacles prevent choking |
