Chapter 2: Origin of Chordates
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Created by:
kellenmontera on January 26, 2012
Subjects:
Comparative Vertebrate Anatomy
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14 terms
Terms | Definitions |
|---|---|
 Hemichordata | -Epidermis - ciliated w/ mucus glands -Body - bilaterally symmetric; unsegmented (no postanal tail) |
| Hemichordata | -Coelomic cavities- 3 ->one for each body part -Proboscis- feeding, burrowing, excretion |
| Hemichordata | Suspension feeders - mucus + cilia -food- Proboscis-> collar sorts food->mouth-> pharynx -> gut -> anus |
| Hemichordata | water->pharyngeal slits->branchial pouch->branchial pore |
| Cephalochordata | basic body is an inversion of dorsoventral body axis of earlier ancestors -have all 5 chordate characteristics |
| Lancelets | -unicellular glands->mucus -bilaterally symmetric, muscle blocks -1 coelomic cavity for trunk |
| lancelets | feeding mechanism- ciliated wheel organs and pharynx pump water + food across P. slits ->atrium and out atriopore |
| Lancelets | -notochord extends into anterior end of body -dorsal tubular nerve cord; but NO brain -closed circulatory system but no heart; contractile ventral blood vessel |
| Lancelets | bury in sediment w/ head protuding out -> feeding |
| Urochordata | at some point in their life, show all 5 chordate characteristics |
| Urochordata larva | notochord, postanal tail, dorsal and tubular nerve cord; disappear in adult |
| sea squirt | Nervous system- reduced; cerebral ganglion Circulatory System- Open; Tubular heart Respiratory System- None; Simple diffusion Reproductive- Monoecious (male and female gametes) Feeding- Suspension (mucus + cilia) |
| Sea squirt | water/food->incurrent siphon->pharyngeal basket-> pharyngeal slits->atrial cavity-> excurrent siphon |
| Endostyle | thin ridge within pharynx -secretes mucus for food capture; metabolizes iodine |
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