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13 Cards in this Set
- Front
- Back
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Phylum Echinodermata
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-"spiny skins"
-deuterostome development -penta-radial symmetry -water vascular system -internal skeleton |
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what type of cells do star-figh (echinodermata) have?
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totipotent cells; any piece can regenerate another starfish
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Phylum Chordata
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Five unique traits:
• 1. Dorsal NOTOCHORD • 2. Pharyngeal GILL SLITS • 3. DORSAL, HOLLOW nerve cord • 4. Ventral HEART • 5. Muscular, POST-ANAL TAIL |
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Craniata
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fish, amphibians, “reptiles,” birds and mammals
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Urochordata
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sea squirts
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Formation of hollow dorsal nerve tube
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The neural plate folds
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Vertebrata
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– From notochord
– Cartilage or bone – Protects nerve cord – provides muscle attachment |
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Origin of vertebrate jaws
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Supporting bony skeletal
rods (gill arches) |
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Class Amphibia
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• Frogs, salamanders, caecilians
• Many (but not all) have this life history sequence: – aquatic fertilization and hatching of larvae – metamorphosis – terrestrial adult |
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The shelled or amniotic egg
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embryo is protected from desiccation
- provides freedom from aquatic environments during reproduction |
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albumin
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protects against infection
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Characters of Mammalia
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• Milk, mammary glands
• Hair • Placement of limbs under body • Lower jaw = 1 bone, the dentary • Three inner ear bones |
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endosymbiosis
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Evolution of the Eukaryote Cell
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