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10 Cards in this Set
- Front
- Back
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Chordata characteristics?? |
Notochord• Dorsal nerve chord• Segmented Postanal tail• Endostyle• Pharyngeal Gill slits
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Urochordata??
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Tunicates, sea squirts ,ascideans. Marine sessile filter feeders with aperforated pharynx. Motile larva.Metamorphoses into adult.
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Urochordata Larva vertebrate –like characteristics??
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hollow dorsalnerve chord, muscular post-anal tail,perforated pharynx, notochord.
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Cephalochordata??
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Amphioxus/lancelet
hollow dorsal nerve chord, muscular post-anal tail, perforated pharynx, notochord + myomeres |
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what determines if an organism is a proto or deuterostome?? |
the fate of theblastopore in the embryo which indeuterostomes becomes the anus whereas inprotostomes it becomes the mouth
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Anatomical Vertebrate characteristics??
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1. Vertebral Column• 2.Cranium• 3. Multilayered epidermis• 4.Endothelium lining the blood vessels
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Embryological Vertebrate characteristics?? |
1. Neural crest cells-Migratory cells giving rise to arange of structures2. Hox genes. Responsible for increased geneticinteraction leading to greater structural complexity.3. Placodes- formation of cranial nerves andcomplex sense organs.4. Formation of Micro RNA’s responsible for derivedvertebrate structures such as the liver and kidney
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Fundamental patterns in coelomate development in Protostomes |
Blastopore = mouth spiral cleavage schizocoelic coelom Ectodermal skeleton |
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Fundamental patterns in coelomate development in Deuterostomes
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Blastopore = anus Radial Cleavage Enterocoelic coelom Mesodermal skeleton |
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Early Vertebrates had??
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Distinct head• Tripartite brain• Chondocranium• Gills used for respiration rather than filterfeeding.
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