The Systems of the Animal Kingdom
 
Listed below are some of the characteristics of the invertebrate phyla for a handy review and study guide.
 
 
Phylum
Circulatory
Respiratory
Digestive

Reproductive

Excretory
Nervous
Skeletal
Muscular
Porifera
None
None

Collar cells and amebocytes

Budding Regeneration, and Gemmules

None
None
Spicules
None
Cnidaria
None
None
Gastrovascular cavity

Budding,Regeneration, Production of sperm and eggs

None
Nerve net found in the mesoglea
None
Muscle cells

Platyhelminthes

None
None
Mouth, pharynx and a gastrovascular cavity

Regeneration, Hermaphroditic

flame cells
Ladder-like nervous system
None
Muscle cells
Nematoda
None
None
Mouth,intestine, anus
Separate sexes
excretory tubules and excretory pore
Circular brain and several longitudinal nerve cords
None
Longitudinal muscles
Annelida
Closed system Aortic arches Dorsal and ventral blood vessels
Skin
Mouth,pharynx, esophagus, crop, gizzard, intestine, anus
Hermaphroditic
Nephridia 2 per segment
Ventral nerve cord with a small anterior brain
None
Longitudinal and circular muscles
Mollusca
Open System with a dorsal heart and sinuses
Gills
see Annelida
Sexual
Nephridia
Brain and ventral nerve cord
Some contain shells
Anterior and Posterior adductor muscles
Arthropoda

Open system with a dordal heart and sinuses

Gills, Tracheal system, book lungs
see Annelida
Sexual: hermaphroditic, seperate sexes, some parthenogenic
Malpighian tubules, green glands
Anterior brain and a ventral nerve cord
Exoskeleton made of chitin
Complex muscular system.