Invertebrate Classification

Question 0

Phylum Nematoda

Answer 0

Roundworms
- bilateral, pseudocoelomate, protostomate, triploblastic 
-marine, freshwater, land 
-many parasitic
SS:
- unidirectional alimentary canal
- hydrostatic skeleton
- nerve cords
-molt(tough cuticle covering)

Question 1

Phylum Platyelminthes

Answer 1

Flatworms
- bilateral, ascoelomate, protostomate,triploblastic
-marine, some fresh water
- some parasites 
SS:
-protonephridia
- Bilateral digestive tract

Question 2

Phylum Mollusca

Answer 2

Mollusks
- bilateral, coelomate, protostomate, triploblastic
- mostly marine 
- very diverse lifestyles 
SS:
- foot
- Mantle
- visceral mass

Question 3

Phylum Annelida

Answer 3

Segmented worms; earthworms, leeches, marine worms
- bilateral, coelomate, triploblastic, protostomate
- marine, freshwater, land
SS:
- circular and longitudinal muscles
- nerves and cerebral ganglia
-closed circulatory system

Question 4

Phylum Arthropoda

Answer 4

Insects, spiders, crustaceans
- bilateral, coelomate, protostomate, triploblastic
- marine, fresh water, land
- can fly
SS:
- chitinous skeleton
- segmented bodies
- developed sensory organs
- open circulatory system

Question 5

Phylum Echinodermata

Answer 5

Sea stars, sea urchins, sand dollars, sea cucumbers
- coelomate, deuterostomate, triploblastic 
- bilateral larvae, pentaradial adults
- marine
- slow moving or sessile
SS:
- calcareous plates and spine
-water vascular system

Question 6

Phylum Porifera

Answer 6

Sponges

• asymmetrical
• marine
• sessile
• no true tissues
• specialized cells
• reproduce by sequential hermaphroditism

Question 7

Phylum Cnidaria

Answer 7

Jellyfish, hydras
- radial Symetry, diploblastic
- marine, some freshwater
- sessile(polyp) motile(medusa)
SS: 
- contractile fibers
- nerves
- cnidocytes( stinging cells)
- Gastrovascular cavity