Term
Porifera- “pore bearer”à Sponges
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Definition
asymmetrical
1. acoelom
2. no metamerism
3. primitive nervous system…sessile
4. monoecious-both sexual and asexual reproduction (regeneration)
5. respiration thru simple diffusion by choanocytes
6. circulatory system absent but nutrients transported by amebocytes
7. choanocytes … filter feeders
8. excretion thru simple diffusion by choanocytes
9. diploblastic
10. internal “skeleton” made of either spongin & spicules
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Term
Cnidaria- “stinging cells”àHydra, jellyfish, coral
Also called Coelenterata-“Hollow gut” |
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Definition
1. radial symmetry
2. acoelom
3. superficial segmentation
4. primitive nerve net
5. dioecious-both sexual and asexual
6. respiration thru diffusion
7. no circulatory system
8. incomplete digestive system- gastrovascular cavity
9. excretion thru diffusion
10. diploblastic
11. two body forms- medusa (free swimming) & polyp (sessile)
stinging cells-nematocytes
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Term
C. Platyhelminthes-“flat worms” à Planaria, tapeworms, flukes
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Definition
1. Bilateral symmetry
2. acoelomates
3. superficial segmentation
4. cephalization
5. monecious- both sexual and asexual
6. respiration thru diffusion
7. no circulatory structures
8. incomplete digestive system
9. excretion thru flame cells
10. triploblastic-protostome
11. many parasites
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Term
| D. Nematoda-“round worm” Ascaris |
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Definition
1. Bilateral symmetry
2. Pseudocoelom
3. no segmentation
4. Cephalization
5. dioecious and monoecious- sexual
6. respiration thru diffusion
7. no circulatory structures
8. complete digestive system
9. excretion thru diffusion
10. triploblastic-protostome
11. most are parasites
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Term
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Definition
1. bilateral symmetry
2. eucoelomate
3. superficial segmentation
4. cephalization
5. monoecious and dioecious-sexual
6. respiration thru gills
7. open circulatory system
8. complete digestive system
9. excretion thru nephridia
10. triploblastic – protostome
11. mantle-secretes shell
3 well known classesà Gastropoda- snails, cephalopoda- octopus,
bivalvia- clams
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Term
F. Annelida-“little rings”à earthworms
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Definition
1. bilateral symmetry
2. eucoelom
3. superficial and internal segmentation
4. cephalization
5. monoecious and dioecious- sexual
6. respiration- diffusion thru skinà MUST remain moist
7. closed circulation * only invertebrate w/ this trait!
8. complete digestive system
9. excretion thru nephridia
10. triploblastic- protostome
11. setae- bristles
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Term
G. Arthropoda-“jointed foot”àinsects, crustaceans(crabs, crayfish), spiders |
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Definition
1. bilateral symmetry
2. eucoelom
3. superficial and internal segmentation
4. cephalization
5. dioecious-sexual
6. gills, tracheal spiracles and book lungs for respiration
7. open circulatory system
8. complete digestive system
9. nephridia and Malphigian tubules
10. triploblastic – protostome
11. exoskeleton- external skeleton that must be shed periodically (molting) in order
organism to grow; made of chitin
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Term
H. Echinodermata-“spiny skin” à starfish, brittle stars, sea cucumbers,
sea urchin
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Definition
1. adult- radial, larval- bilateral
2. eucoelomate
3. superficial segmentation
4. primitive nervous response, no cephalization
5. dioecious- sexual and asexual
6. respiration by diffusion
7. open circulation
8. complete digestive system
9. excretion by diffusion
10. triploblastic- deuterstome*
11. larval form more advanced than adult
water vascular system
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Term
| Chordata-“animals w/ backbones”àfish, frogs, lizards, birds, mammals |
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Definition
1. bilateral symmetry
2. eucoelomate
3. internal segmentation
4. cephalization
5. dioecious- sexual
6. respiration by gills or lungs
7. closed circulatory system
8. complete digestive system
9. excretion thru kidneys
10. triploblastic- deuterostome
11. endoskeleton- internal skeleton
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